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2 3 intelligent lighting family product guide part number description package(s) available page no. ccfl/eefl intelligent inverter ? controller ics lcd monitor (lcdm) applications oz9919 selectable lcdm controller 16 sop, lead-free 7 oz9933 lcdm full-bridge controller 16 pdip, sop, lead-free 8 oz9937 universal lcd panel controller 16 sop, lead-free 9 oz9938 multi-lamp controller 16 pdip, soic, lead-free 10 lcd tv applications oz9928* lcd tv dual controller 30 ssop, lead-free 11 oz9966* large-size lcd tv controller 24 sop, ssop, lead-free 12 oz9972/ oz9972a* high power lcd tv controller 24 sop, ssop, lead-free/ 28 ssop, lead-free 13 oz9976* of ine lcd tv controller 16 sop, lead-free 14 led backlight controller ics notebook / netbook applications oz9901 lcd bias supply controller 24 qfn, lead-free 15 oz9955a eight string led controller 24 qfn, lead-free 16 oz9955b eight string smbus led controller 24 qfn, lead-free 17 oz9956b six string led controller 20 qfn, lead-free 18 oz9956c white led backlight controller 20 qfn, lead-free 19 oz9960 high power led controller 12 dfn, 16 ssop, lead-free 20 oz9979 six string w/phase-shift dimming, internal mosfet 20 qfn, lead-free 21 oz9989 three string led controller 12 dfn, lead-free 22 oz9993 low cost white led controller so t23-6l, lead-free 23 intelligent lighting family product guide part number description package(s) available page no. led backlight controller ics (cont.) monitor applications oz9902 dual channel high power led driver 24 sop, ssop, lead-free 24 oz9906 six string led controller 28 e-tssop, sop, lead-free 25 oz9908 eight string high power led controller 48 lqfp, 40 qfn, lead-free 26 oz9961 six string led controller 20 e-tssop, ssop, lead-free 27 oz9967 six string high power led controller 28 sop, ssop, tssop, lead-free 28 oz9997 led backlight controller 24 e-tssop, qfn, sop, lead-free 29 oz9998/ oz9998a eight string high power led controller 24 e-tssop, qfn, sop, lead-free 30 oz9998b four string high power led controller 16 e-tssop, pdip, qfn, sop, lead-free 31 tv applications oz9902 dual channel high power led driver 24 sop, ssop, lead-free 24 oz9902b single channel high power led driver 16 qfn, sop, lead-free 32 oz9904 four string led controller 28 ssop, lead-free 33 oz9904a eight string led controller 40 qfn, lead-free 34 oz9906 six string led controller 28 e-tssop, sop, lead-free 25 oz9908 eight string high power led controller 48 lqfp, 40 qfn, lead-free 26 oz9908a six string high power led controller 28 sop, tssop, lead-free 35 oz9908b six string high power led controller 32 lqfp, sop, lead-free 36 oz9967 six string high power led controller 28 sop, ssop, tssop, lead-free 28 * note: the oz9928, oz9966, oz9972/72a, oz9976, and oz9977/77a/77b are inverter controllers specially designated for use in te levisions or applications with multiple lamps, are warranted and licensed for use in these or any other appropriate applications, and are sold with a license to all relevant o2micro patents. sale of all other o2micro inverter controllers are subject to the following restrictions: (i) the product is not warranted, indemni ed, or licensed for use in televisions or applications with multiple lamps; (ii) sale of the product and license to o2micro inverter controller patents are expressly con ditioned upon not using this product in a television or applications with multiple lamps; (iii) by using the product, you agree to notify customers of the limited scope of the license and sale; and (iv) use of the product in a television or applications with multiple lamps is expressly prohibited, is a material breach of such sale, and vio lates any express or implied license to any o2micro patent. all sales are subject to o2micros conditions and terms of sale and use. http://www..net/
4 5 intelligent lighting family product guide part number description package(s) available page no. led backlight controller ics (cont.) tv applications oz9984 led balance controller 16 sop, lead-free 37 oz9986/ oz9986a phase-shift, 6 string high power led controller 30 sop, ssop, lead-free/ 24 sop, lead-free 38 oz9998a eight string high power led controller 24 e-tssop, qfn, sop, lead-free 30 oz9998b four string high power led controller 16 e-tssop, pdip, qfn, sop, lead-free 31 general lighting applications oz8020 linear led driver to220, lead-free 39 OZ8022 high brightness led dc/dc controller sot23-6, lead-free 40 oz9984 led balance controller 16 sop, lead-free 37 oz9987 ac/dc current mode pwm 8 pdip, sot23-6l, lead-free 41 oz9988 single cell battery led controller 8 dfn, sop, lead-free 42 oz9991/ oz9991a high power led buck converter controller 8 sop, sot23-6l, lead-free/ sot23-6l, lead-free 43 oz9992 of ine led driver 8 sop, lead-free 44 oz9994 isolated ac/dc controller 8 sop, lead-free 45 oz9995 non-isolated ac/dc led controller w/ analog dimming 8 sop, lead-free 46 automotive / car tv / gps / pnd applications oz523 step down dc/dc converter 8 sop, lead-free 47 oz524 step down 3a dc/dc converter 8 e-sop, lead-free 48 oz526 white led controller 12 dfn, lead-free 49 oz527 automotive gps led controller 24 e-tssop, qfn, lead-free 50 oz528 lcd bias supply controller 28 e-tssop, qfn, lead-free 51 oz9960 high power led controller 12 dfn, 16 ssop, lead-free 20 intelligent lighting family product guide part number description package(s) available page no. led backlight controller ics (cont.) automotive / car tv / gps / pnd applications oz9961 six string led controller 20 e-tssop, ssop, lead-free 28 oz9965 led controller + 2 ?dc/dc 28 e-tssop, lead-free 52 oz9990 four string, high power, buck/ boost led driver 24 e-tssop, lead-free 53 oz9993 low cost white led controller so t23-6l, lead-free 24 oz9998a eight string high power led controller 24 e-tssop, qfn, sop, lead-free 30 power management ics pdvd / photo frame applications oz522 charger + dc/dc pmu 20 ssop, lead-free 54 dc/dc applications oz523 step down dc/dc converter 8 sop, lead-free 47 oz524 step down 3a dc/dc converter 8 e-sop, lead-free 48 oz525 asymmetrical llc dc/dc controller 16 sop, lead-free 55 oz529 dc/dc buck converter w/usb power switch 16 e-sop, sop, lead-free 56 ac/dc applications oz530 pfc flyback controller 16 sop, lead-free 57 oz531 current mode pwm controller 8 sop, lead-free 58 oz9987 ac/dc current mode pwm 8 pdip, sot23-6l, lead-free 41 http://www..net/
led monitor & tv digital photo frame 6 7 oz9919 features ?supports half-bridge or push-pull topology ?0% to 100% pwm dimming range ?constant operating frequency ?drives positive/negative-impedance lamps during ignition ?high drive current for external mosfets ?user-de ned ignition time and shutdown delay time ?built-in intelligence for lamp ignition and normal operation of ccfls ?open-lamp and over-voltage protection ?soft-start function general description oz9919 is a high performance, cost-effective cold cathode fluorescent lamp (ccfl) controller designed to drive large-size lcd monitors using 2 or 4 ccfls. this controller converts an unregulated dc voltage into a nearly sinusoidal lamp volt- age and current waveforms. it supports either half-bridge or push-pull power conver- sion topology, while maintaining high ef ciency operation. the oz9919 offers a high level of integration, while maintaining exibility and high ef ciency operation that reduces external component heating, resulting in higher reliability and longer ccfl life. the proprietary design technique provides a simple, low-cost system solution. applications application diagram ?lcd monitor u.s. patent #s 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,897,698; 6,900,993; 7,026,860; 7,120,035; 7,151,394; 7,394,209; 7,417,382; 7,515,445; 7,515,446; 7,777,425; and more patents pending. intelligent lighting mission statement be the leading supplier of highly ef cient intelligent lighting solutions for power management of electronic products in the computer, consumer, industrial, automotive, and communications markets worldwide. product o 2 micro offers a family of intelligent lighting backlight cold cathode fluorescent lamp (ccfl), external electrode fluorescent lamp (eefl), flat fluorescent lamp (ffl), and led controllers ideal for various sizes of liquid crystal display (lcd) and power management unit (pmu) applications ?e.g., monitors, tvs, notebooks/ netbooks, pdvds, car tvs, gps, digital photo frames, pnds (personal navigation devices). solutions are also available for general lighting and automotive applications. consumer applications http://www..net/
8 9 oz9933 features ?constant operating frequency ?drives positive/negative-impedance lamps during ignition ?high drive current for external mosfets ?user-de ned ignition time and shutdown delay time ?built-in intelligence for lamp ignition and normal operation of ccfls ?open-lamp and over-voltage protection ?soft start function general description oz9933 is a high performance, cost-effective cold cathode fluorescent lamp (ccfl) controller designed to drive large-size lcd applications using 2. 4, or 6 ccfls. it supports a full bridge, power conversion topology, while maintaining high ef ciency operation. this controller converts an unregulated dc voltage into a nearly sinusoidal lamp volt- age and current waveforms. it supports full-bridge power conversion topology, while maintaining high ef ciency operation. the oz9933 offers a high level of integration, while maintaining exibility and high ef ciency operation that reduces external component heating, resulting in higher reliability and longer ccfl life. the proprietary design technique provides a simple, low-cost system solution. applications application diagram ? lcd monitor u.s. patent #s 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,897,698; 6,900,993; 7,026,860; 7,120,035; 7,151,394; 7,394,209; 7,417,382; 7,515,445; 7,515,446; 7,777,425; and more patents pending. oz9937 features ?universal panel interface ?drives positive/negative-impedance lamps during ignition ?independent pwm and analog dimming control ?operating frequency compensation ?user-de ned pwm dimming frequency ?user-de ned striking and normal operating frequency ?open-lamp and over-voltage protection ?user-de ned ignition and shutdown delay time ?soft start function general description the oz9937 is a high performance, cost-effective cold cathode fluorescent lamp (ccfl) controller designed to drive large-size lcd monitor applications using 2 to 6 ccfls. oz9937 receives a panel id signal from the system and provides an optimal operat- ing frequency and power to the lcd panel. the adaptive feature enables a single inverter design to suit various panel applications. the controller converts unregulated dc voltage into a nearly sinusoidal lamp voltage and current waveforms. it provides two drive signals for most power conversion topologies, while maintaining high ef ciency operation. applications application diagram ?lcd monitor u.s. patent #s 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,900,993; 7,120,035; 7,372,213; 7,394,209; 7,417,382; 7,515,445; 7,515,446; 7,777,425; and more patents pending. http://www..net/
10 11 oz9938 features ?positive pwm dimming polarity ?constant operating frequency ?drives positive/negative-impedance lamps during ignition ?high drive current for external mosfets ?user-de ned ignition time and shutdown delay time ?multiple mode dimming control ?built-in intelligence for lamp ignition and normal operation of ccfls ?open-lamp and over-voltage protection ?soft start function general description the oz9938 is a high performance, cost-effective cold cathode fluorescent lamp (ccfl) controller designed to drive large-size lcd applications requiring 2 to 6 ccfls. this controller converts an unregulated dc voltage into a nearly sinusoidal lamp volt- age and current waveforms. it provides two drive signals for most power conversion topologies, while maintaining high ef ciency operation. the oz9938 offers a high level of integration, while maintaining exibility and high ef ciency operation that reduces external component heating. this results in higher reliability and longer ccfl life. the proprietary design technique provides a simple, low-cost system solution. applications application diagram ?lcd monitor u.s. patent #s 6,104,146; 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,897,698; 6,900,993; 7,095,392; 7,120,035; 7,151,394; 7,233,117; 7,372,213; 7,394,209; 7,417,382; 7,515,445; 7,515,446; 7,777,425; and more patents pend- ing. oz9928 features ?dual ccfl inverter controller ?synchronization for multiple ics ?supports differential drive ?supports system operation frequency synchronization ?constant operating frequency ?180 degree phase-shift pwm dimming ?mixed-mode dimming control ?integrated high side n-mosfet driver ?high drive capability ?selectable shutdown protection mode ?user-de ned ignition and shutdown delay timers ?built-in intelligence for lamp ignition and normal operation of ccfls ?open-lamp and over-voltage protection ?soft start function general description the oz9928 is a high performance, cost-effective, 2-channel controller designed for large-size cold cathode fluorescent lamp (ccfl) or external electrode fluorescent lamp (eefl) lcd tv applications. the controller provides six drive signals and is capable of driving full-bridge and class-d topologies. the drive outputs are xed phase when used for single-side or differential drive applications. multiple oz9928s can be synchronized to drive numer- ous lamps. oz9928 provides total system protection for differential drive and single-side drive applications. it receives either a dc voltage and/or external pulse width modulation (pwm) signal to perform mixed-mode pwm dimming. applications application diagram ?lcd tv u.s. patent #s 6,104,146; 6,259,615; 6,396,722; 6,501,234; 6,570,344; 6,707,264; 6,781,325; 6,804,129; 6,897,698; 6,936,975; 7,075,245; 7,095,392; 7,126,289; 7,151,394; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,477,024; 7,515,445; 7,515,446; 7,550,928; 7,554,273; 7,777,425; and more patents pending. http://www..net/
12 13 u.s. patent #s 6,259,615; 6,396,722; 6,570,344; 6,781,325; 6,804,129; 6,897,698; 6,936,975; 7,075,245; 7,126,289; 7,151,394; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,515,445; 7,515,446; 7,550,928; 7,554,273; 7,777,425; and more patents pending. oz9966 features ?full-bridge or dual-forward topology ?integrated high side n-mosfet driver ?high drive capability and system synchronization ?dedicated pins for analog and lpwm dimming ?selectable pwm dimming polarity ?constant operating frequency ?built-in intelligence to manage lamp ignition and normal operation ?open-lamp, over-voltage, over-current, and under-voltage lockout protection ?user-de ned striking and shutdown delay timers ?soft start function general description the oz9966 is a high performance controller designed for large-size lcd tv ap- plications requiring multiple lamps. it achieves a high ef ciency power conversion with minimal switching loss using a full-bridge n-channel mosfet topology. the oz9966 is ideal for single-side drive or differential drive applications. oz9966 allows selection of the pulse width modulation (pwm) dimming polarity, and provides two dedicated pins for analog and pwm dimming control. applications application diagram ?lcd tv u.s. patent #s 6,259,615; 6,396,722; 6,570,344; 6,781,325; 6,804,129; 6,897,698; 6,936,975; 7,075,245; 7,126,289; 7,151,394; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,515,445; 7,515,446; 7,550,928; 7,554,273; and more patents pending. oz9972/72a features ? oz9972: system synchronization for dimming and operation frequency ?full-bridge topology ?integrated high side n-mosfet driver ?high drive capability and soft start function ?constant operating frequency ?built-in intelligence to manage lamp ignition and normal operation of ccfls ?open-lamp, over-voltage, over-current, and under-voltage lockout protection ?user-de ned striking and shutdown delay timers ?soft start function general description oz9972/72a are high performance, pulse width modulation (pwm) controllers designed for large-size lcd tv applications requiring multiple lamps. they achieve high ef ciency power conversion with minimal switching loss in a pwm, full-bridge, n-channel mosfet topology. oz9972/72a provide high drive capability, support a wide input range, and provide a constant, user-de ned operating frequency. applications application diagrams ?lcd tv http://www..net/
14 15 u.s. patent #s 6,259,615; 6,396,722; 6,570,344; 6,781,325; 6,804,129; 6,809,938; 6,856,519; 6,900,993; 6,936,975; 7,075,245; 7,120,035; 7,126,289; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,515,445; 7,515,446; 7,550,928; 7,554,273; and more patents pending. oz9976 features ?of ine inverter controller (ipb) ?supports both xed and variable frequency applications ?half-bridge or push-pull topology ?directly drives pulse transformers ?dedicated pins for analog and lpwm dimming ?user-de ned minimum operating frequency ?user-de ned striking frequency range ?open-load, over-voltage, and under-voltage lockout protection ?user-de ned striking and shutdown delay timers ?soft start function general description the oz9976 is a high ef ciency, pulse width modulation (pwm) controller designed for off line lcd backlight application. it achieves high ef ciency power conversion with minimal switching loss using zero current switching (zcs) technology. oz9976 applications can operate under xed or variable operating frequency with zcs tech- nology. the minimum operating frequency can be set by either an external rc network or operate in self-oscillating mode. the intelligent operating frequency management circuitry extends cold cathode fluorescent lamp (ccfl) lifetime and offers design exibility. applications application diagram ?lcd tv oz9901 features ?integrated 3a, 0.2 ? switching mosfet ?integrated vgh and vgl charge pump regulators ?adjustable vgh delay ?operational ampli er for vcom buffer ?open-drain reset output for tcon ?1.2mhz xed switching frequency boost converter with soft start and adjustable output ?thermal protection general description oz9901 offers a complete power supply solution for tft lcd panel applications. the lcd bias supply controller consists of a high performance boost converter, open drain reset output, charge-pump regulators for vgh and vgl, operational ampli er, input voltage detector and a logic-controlled gate-on pulse modulator. the boost con- verter operates using current mode control, and offers fast line and load responses for lcd bias supplies. the integrated charge pumps provide a regulated supply for the panel gate driver ics. the charge-pump regulators provide a positive gate-on supply voltage (vgh) and negative gate-off supply voltage (vgl). the operational ampli er works as a vcom buffer and supplies a high output current, fast slew rate and wide bandwidth for driving capacitive loads. applications application diagram ?notebook/netbook computer u.s. patent #7,498,793; and more patents pending. http://www..net/
16 17 oz9955a features ?50v internal mosfet high frequency dc/dc converter controller ?drives up to 8 strings in parallel ?integrated led current balance control circuit ?integrated power mosfet ?up to 2.0mhz user-de ned switching frequency ?supports internal or external pwm dimming ?over-voltage, over-current, output short circuit, and thermal protection ?led fault status output ?soft start function general description oz9955a is a high ef ciency, dc/dc controllers that drive up to eight (8) strings of leds in parallel con guration, with multiple leds in each string connected in series. it provides eight (8) led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. oz9955a can receive either a dc signal for internal low frequency pulse width modula- tion (lpwm) or an external pwm signal. this ic provides integrated circuits to balance the current ow through each led string, as well as, integrated power mosfets. applications application diagram ?notebook/netbook computer u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9955b features ?high frequency dc/dc power converter controller ?drives up to 8 strings in parallel ?supports smbus, dpst and smbus + dpst brightness control modes ?supports smbus protocol dimming control ?256 step dimming control ?integrated led current balance control circuit ?integrated power mosfet ?over-current, over-voltage, and thermal protection ?soft start function general description oz9955b is a led controller with smbus interface that drives up to eight (8) strings of leds in parallel con guration, with multiple leds in each string connected in se- ries. it is targeted for notebook/netbook applications using smbus dimming control. it provides eight (8) led current sense inputs in an ?r?con guration for improved backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. this ic provides an integrated circuit to balance the current ow through each led string, as well as, the integrated power mosfet. applications application diagram ?notebook/netbook computer u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
18 19 oz9956b features ?high frequency dc/dc power converter controller ?drives up to 6 strings in parallel ?integrated led current balance control circuit ?wide input voltage range ?up to 2.0mhz switching frequency ?external pwm dimming ?over-voltage and over-current protection ?soft start function general description the oz9956b is a high ef ciency, dc/dc controller that drives up to six (6) strings of leds in parallel con guration, with multiple leds in each string connected in series. it is targeted for notebook/netbook applications. it provides six (6) led current sense inputs in an ?r?con guration for improved backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. oz9956b can receive either an analog signal or an external pulse width modulation (pwm) signal for the dimming control function. this ic provides an integrated circuit to balance the current ow through each led string, as well as, the integrated power mosfet. applications application diagram ?notebook/netbook computer u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9956c features ?high frequency dc/dc power converter controller ?drives up to 6 strings in parallel ?integrated led current balance control circuit ?integrated power mosfet ?up to 1.5mhz switching operation ?supports phase-shift dimming with adaptive phase control ?external pwm dimming control ?output over-voltage and short circuit protection ?led over-current and short circuit protection ?switch over-current protection ?thermal protection ?under-voltage protection general description the oz9956c is a high ef ciency, dc/dc controller that drives up to six (6) strings of leds in parallel con guration, with multiple leds in each string connected in series. it is targeted for notebook/netbook applications. it provides six (6) led current sense inputs in an ?r?con guration for improved backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. oz9956c supports an external pulse width modulation (pwm) signal for the phase- shifted dimming control function. it provides an integrated circuit to balance the cur- rent ow through each led string, as well as, the integrated power mosfet. applications application diagram ?notebook/netbook computer u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
20 21 oz9960 features ?high frequency dc/dc boost converter controller ?integrated power mosfet ?supports low input voltage ?up to 200ma led current ?external pwm dimming ?open led protection ?mosfet over-current protection ?soft start function general description oz9960 is a high ef ciency dc/dc boost converter controller that drives a string of leds connected in a serial con guration. it is ideal for small and mid-size lcd backlight applications. oz9960 supports a wide input range and constant, user-de ned operating frequency for a single string led application. it receives an external pulse width modulation (pwm) signal for dimming control. applications application diagram ?notebook/netbook computer ?gps ?pnd patents pending. oz9979 features ?high ef ciency dc/dc boost converter controller ?drives up to 6 strings in parallel ?enhanced dimming resolution ?supports 6 equal-delay pwm dimming signals ?integrated power mosfet ?integrated led current balance control circuit ?supports external, internal pwm and analog dimming ?pwm dimming frequency synchronized with external signal ?mosfet over-current protection ?over-voltage protection ?led short circuit detection ?output short circuit/open diode protection ?thermal protection ?soft start function general description oz9979 is a high ef ciency, dc/dc controller that drives up to six strings of leds connected in parallel con guration; with multiple leds in each string connected in series. it is targeted for notebook backlight applications. the ic provides six (6) led current sense inputs in an ?r?con guration for im- proved backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. applications application diagram ?notebook computer u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
22 23 oz9989 features ?high frequency dc/dc power converter controller ?drives up to 3 strings in parallel ?integrated power mosfet ?integrated led current balance control circuit ?fixed 1.3mhz switching frequency ?external pwm dimming ?mosfet over-current protection ?over-current protection for each string ?output short circuit detection ?open diode, over-voltage and thermal protection ?soft start function general description oz9989 is a high ef ciency, dc/dc controller with an integrated power mosfet that drives up to three strings of leds connected in parallel con guration; with multiple leds in each string connected in series. it is targeted for netbook backlight applica- tions. the ic provides three (3) led current sense inputs in an ?r?con guration for improved backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. oz9989 uses an external pulse width modulation (pwm) signal for the dimming control function. applications application diagram ?netbook computer ?pnd u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9993 features ? high frequency dc/dc boost converter controller ?supports a single cell liion battery ? fixed 900khz switching frequency ? integrated power mosfet with over-current protection ? open diode, over-voltage, and output short circuit protection ? thermal protection ? soft start function general description oz9993 is a high ef ciency, dc/dc controller with an integrated power mosfet that drives one string of leds. it provides the user with a low cost solution that requires minimum components for the boost regulator and is suitable for applications requir- ing a single cell lithium ion battery. a soft start feature is provided to minimize in-rush current during start-up. applications application diagram ?netbook ?pnd ?camcorder u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
24 25 oz9902 features ?dual channel dc/dc converter ?constant current or voltage output ?drives one string of high power leds per channel ?180 degrees phase-shift between the two driver outputs ?independent pwm dimming control for each channel ?analog dimming ?constant operation frequency ?operation frequency synchronization ?power mosfet over-current protection ?over-voltage protection ?output to return and output to ground short-circuit protection ?output over load protection ?limited current condition (lcc) protection ?thermal protection ?led fault status output general description oz9902 is a dual, high power led driver designed to build led backlight for large- size lcd tv applications. it integrates two independently-controlled led drivers to achieve optimum ef ciency. the drive outputs are phase-shifted by 180 degrees to minimize current ripple in high power applications. oz9902 supports independent pulse width modulation (pwm) dimming control for each channel and common analog dimming control for both channels. it provides system design exibility for lcd tv with local dimming or 3d display mode. applications application diagram ?lcd monitor ?lcd tv patents pending. oz9906 features ?switch-mode dc/dc controller to balance led current ?high current output drive for 6 led strings ?spread spectrum feature on operating frequency ?high ef ciency led current regulation ?supports analog and external pwm dimming ?user-de ned phase-shift pwm dimming function with 2 to 6 phase options ?pwm dimming frequency synchronization ?mosfet over-current protection ?led short circuit protection ?user-de ned short circuit protection threshold ?led fault status output general description the oz9906 is a high ef ciency switch-mode dc/dc controller that drives up to 6 led strings connected in parallel. it is targeted for large-size monitor and tv applica- tions. oz9906 provides six (6) led current sense inputs. the ic provides individual led current regulation for each led string. this allows the backlight to remain function- ing in the event that any string(s) is damaged during normal operation. applications application diagram ?lcd monitor ?lcd tv u.s. patent #7,847,783; and more patents pending. http://www..net/
26 27 oz9908 features ?supports 8 strings of 355ma leds ?supports master-slave synchronous operation ?boost converter switching at 180 degree phase-shift between master and slave ics ?supports analog dimming ?individual pwm dimming for each led string ?supports over-voltage and over-current protections in application ?supports led open/short circuit protection ?led fault status output general description the oz9908 is a led driver controller designed for large-screen lcd backlit by leds. it provides an integrated eight channel led current regulation control circuit. using external balance transistors for each channel, the ic is capable of driving a current up to 350ma per led channel. oz9908 provides individual pulse width modulation (pwm) dimming for its respec- tive led string. the ic is suitable for lcd tv applications where area-lighting tech- nology using local dimming control is applied. applications application diagram ?lcd monitor ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9961 features ?high frequency dc/dc power converter controller ?drives 6 led strings in parallel ?integrated led current balance control circuit ?up to 2.35mhz switching frequency ?analog or external pwm or internal lpwm dimming control ?over-current and over-voltage protection ?thermal protection ?open diode and open/short circuit protection ?soft start function general description the oz9961 is a led controller that drives up to six (6) strings of leds in parallel con guration, with multiple leds per string connected in series. it provides six (6) led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is dam- aged during normal operation. oz9961 supports either analog, external pulse width modulation (pwm) or internal low frequency pwm (lpwm) dimming control. applications application diagram ?lcd monitor ?gps u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
28 29 oz9967 features ?high frequency dc/dc boost converter controller ?drives 6 led strings in parallel ?integrated led current balance control circuit ?up to 1mhz switching frequency ?external pwm or internal lpwm dimming control ?led short circuit protection ?over-current and over-voltage protection ?soft start function general description the oz9967 is an led controller that drives up to six (6) strings of leds in parallel con guration, with multiple leds per string connected in series. it provides six (6) led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is dam- aged during normal operation. oz9967 supports external pulse width modulation (pwm) or internal low frequency pwm (lpwm) dimming control. plus, it provides an integrated circuit to balance the current ow through each led string. the balance transistors are external to ac- commodate different power dissipation resulting from the forward voltage difference among the led strings. applications application diagram ?lcd monitor ?lcd tv u.s. patent #7,847,783; and more patents pending. oz9997 features ?high power dc/dc boost converter controller ?drives up to 8 led strings in parallel ?external pwm dimming control ?integrated led current balance control circuit ?user-de ned string selection ?multi-chip parallel operation for more than 8 led strings ?mosfet over-current protection ?led short circuit and open string protection ?thermal protection ?led fault status output general description the oz9997 is a high ef ciency, dc/dc controller that drives up to eight (8) strings of leds in parallel con guration, with multiple leds in each string connected in series. the ic provides eight (8) led current sense inputs in an ?r?con guration to im- prove backlight reliability. this allows the backlight to remain functioning in the event that any string(s) is damaged during normal operation. oz9997 supports external pulse width modulation (pwm) dimming control, and provides an integrated circuit to balance the current ow through each led string. applications application diagram ?lcd monitor u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
30 31 oz9998b features ?high power dc/dc boost converter controller ?drives up to 4 strings in parallel, up to 160ma per string ?integrated led current balance control circuit ?external pwm dimming control ?time-shift pwm phase dimming control for low audible noise ?mosfet over-current protection ?led short circuit and open string protection ?thermal protection ?led fault status output general description oz9998b is a high ef ciency dc/dc controller that drives up to eight strings con- nected in parallel con guration with multiple leds in each string connected in series. it provides four (4) led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that a string(s) is damaged during normal operation. oz9998b supports external pulse width modulation (pwm) dimming control. applications application diagram ?lcd monitor ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9998/98a features ? oz9998: up to 60ma per isen channel ? oz9998a: up to 80ma per isen channel ?high power dc/dc boost converter controller ?drives up to 8 strings in parallel ?integrated led current balance control circuit ?user-de ned string selection ?external pwm dimming control ?time-shift pwm phase dimming control for low audible noise ?multi-chip parallel operation for more than 8 led strings ?mosfet over-current protection ?led short circuit and open string protection ?thermal protection ?led fault status output general description oz9998/98a are high ef ciency, dc/dc controllers that drive up to eight (8) strings of leds connected in parallel con guration, with multiple leds in each string con- nected in series. they provide eight (8) led current sense inputs in an ?r?con gu- ration to improve backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. oz9998/98a support external pulse width modulation (pwm) dimming control. plus, each provides an integrated circuit to balance the current ow through each led string. applications application diagram ?lcd monitor ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
32 33 oz9902b features ?constant current or voltage output ?drives one string of high power leds ?direct pwm dimming control ?analog dimming ?constant operation frequency ?power mosfet over-current protection ?over-voltage protection ?output to return and output to ground short circuit protection ?output over load protection ?thermal protection ?led fault status output general description oz9902b is a single channel high power led driver designed for led backlight ap- plications used in large-size lcd tvs. the controller supports direct pulse width modulation (pwm) dimming control and common analog dimming control for led string forward current. applications application diagram ?lcd tv patents pending. oz9904 features ?supports 4 strings ?up to 355ma led current per string ?supports external and internal pwm dimming control ?supports analog dimming ?over-voltage and over-current protections in applications ?supports led open/short circuit protections in applications ?led fault status output general description the oz9904 is a led driver controller optimized for large screen led backlit lcd tv applications. it provides an integrated four-channel led current control circuit. in application, it controls external balance transistors to maintain the current balance among led strings. oz9904 supports both internal and external pulse width modulation (pwm) dimming methods for brightness control of lcds for various system applications. the internal pwm dimming signal can also be synchronized with the vertical sync signal of the lcd display. the ic further supports an analog dimming control function, which adjusts the led current amplitude of all the four isen channels simultaneously. applications application diagram ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
34 35 oz9904a features ?drives up to 8 strings of leds ?up to 350ma led current per string ?supports two boost converters in parallel ?180 degree phase-shift between the two drive outputs ?provides two sets of pwm dimming control ?built-in 180 degree phase-shift pwm dimming control synchronization ?supports analog dimming ?over-voltage and over-current protection ?supports led open/short circuit protection ?led fault status output general description oz9904a is a high performance led driver controller optimized for large screen led backlight lcd tv applications. it provides two high-voltage gate drive signals for the boost converters, with 180 o phase-shift between the two signals. the ic minimizes input and output current ripple. it also provides a exible design using only one drive signal for low-power ap- plications through pin drvsel. oz9904a supports both internal and external pulse width modulation (pwm) dim- ming interfaces for various system con gurations or internal low frequency pwm (lpwm) dimming control. applications application diagram ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9908a features ?drives up to 6 strings of leds ?up to 350ma led current per string ?multiple ic parallel operation with power train sharing ?primary side regulation application ?analog dimming control ?individual pwm dimming for every 3 strings ?over-voltage and over-current protection ?led open/short circuit protection ?led fault status output general description the oz9908a is a high performance led driver controller optimized for large screen led backlight lcd tv applications. it provides an integrated six channel led current regulation control circuit. using external balance transistors for each channel, the ic is capable of driving a current up to 350ma per led channel. oz9908a provides two external pulse width modulation (pwm) dimming inter- faces for the six led strings. each pwm signal controls the brightness of three led strings. this feature is suitable for lcd tv applications using a scanning backlight or 3-dimensional display mode functions. applications application diagram ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. http://www..net/
36 37 oz9908b features ?drives up to 6 strings of leds ?up to 350ma led current per string ?supports multiple ic operation synchronization ?boost drive outputs 180 degree phase-shift between master and slave ics ?analog dimming control ?individual pwm dimming for each string ?over-voltage and over-current protection ?led open/short circuit protection ?led fault status output general description the oz9908b is a high performance led driver controller optimized for large screen led backlight lcd tv applications. it provides an integrated six channel led current regulation control circuit. using external balance transistors for each channel, the ic is capable of driving a current up to 350ma per led channel. oz9908b provides 6 individual external pulse width modulation (pwm) dimming interfaces for its respective led string. the ic is suitable for lcd tv applications using a local-dimming control backlight. when using multiple ics, the operating frequency can be synchronized with a 180 o phase-shift between the drive outputs of each ic. these features greatly reduce the interference between ics. applications application diagram ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9984 features ?drives up to 4 led strings in parallel ?supports up to 350ma led current per string ?integrated led current balance control circuit ?multi-chip parallel operation ?analog dimming control ?over-voltage and led short circuit protection ?soft start function general description oz9984 is a high ef ciency led driver ic that works in conjunction with a primary side external pulse width modulation (pwm) controller, for of ine, isolated led light- ing application. it has four (4) led current sense inputs in an ?r?con guration to ensure uniform lighting of the leds. it can drive up to 4 strings of leds in parallel and up to 9 leds per string connected in series. oz9984 supports up to 350ma of led current per string. it is designed in such a way that if any led string is damaged during normal operation, the remaining string (s) continue normal operation. multi-chip parallel operation supports additional led strings. applications application diagram ?lcd tv ?general lighting u.s. patent #7,847,783; and more patents pending. http://www..net/
38 39 oz9986/86a features ? oz9986: boost and buck converter ? oz9986a: buck converter ?high ef ciency dc/dc converter controller ?drives up to 6 strings in parallel; number of leds in series limited by external mosfet rating ?supports up to 3 phase-shift drive outputs for boost converter ?high ef ciency switching mode led current balance ?user selectable phase-shift pwm dimming function with 3, 4, 5 and 6 phases ?pwm dimming control signals synchronized with external signal ?over-voltage and over-current protection ?soft start function general description oz9986/86a are high ef ciency, dc/dc controllers that drive up to six (6) strings connected in parallel con guration with multiple leds in each string connected in series. they are targeted for large-size monitor and tv applications. they provide six (6) led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. oz9986/86a support internal pulse width modulation (pwm) dimming control. plus, each provides an integrated circuit to balance the current ow through each led string. applications application diagrams ?lcd monitor ?lcd tv u.s. patent #7,498,793; 7,847,783; and more patents pending. oz8020 features ?controller for high brightness leds ?supports up to 400v dc ?user-de ned constant current control ?supports led current up to 100ma ?thermal protection general description oz8020 is a linear led driver for general lighting applications. it requires a minimum number of external components to operate, while providing application exibility to accommodate different system requirements. for application exibility, the device can be connected at either the anode or cathode terminal of the led string. oz8020 operates in constant current mode, and the led current is user-de ned through an external resistor. applications application diagram ?general lighting patents pending. http://www..net/
40 41 OZ8022 features ?quasi-resonant converter controller for high brightness leds ?three-level analog dimming control using a wall switch (patent pending) ?low start-up current and operating current maximizing conversion ef ciency ?peak current mode control simpli es circuit design ?under-voltage lockout with hysteresis ?minimum off-time control for light-load operation maximizing ef ciency ?provides complete protection functions: - maximum gate drive output at 18v - over-voltage protection for ic bias voltage - cycle-by-cycle current limit at current sense - led short circuit protection - output over-voltage and internal thermal protection general description OZ8022 is a controller for buck converter utilizing quasi-resonant conversion technology. it can be used to drive high-brightness leds in of ine applications. the controller is implemented with a compensated peak current mode control to regulate the average led current. the operation of the buck converter is between the continuous mode and the dis- continuous mode of the inductor current. during light-load condition, it provides a minimum off-time scheme to maximize the operating ef ciency. it provides a propri- etary (patent pending) dimming technology by turning on/off the wall switch. applications application diagram ?general lighting patents pending. oz9987 features ?low cost yback controller ?audio noise free operation ?low start-up current ?current mode operation ?under-voltage lockout ?secondary over-current protection with frequency foldback ?integrated synchronized slope compensation ?soft driver for improved emi signature ?user-de ned pwm frequency ?leading edge blanking on cs pin ?constant maximum output power for universal ac input range ?protection features: - clamped gate output voltage to 178v - vdd over-voltage protection - cycle-by-cycle current limiting - secondary output short circuit and over load protection general description oz9987 is an integrated current mode pulse width modulated (pwm) controller that is ideal for low power, of ine, ac/dc yback converter applications. the pwm oper- ating frequency is determined by an external resistor. with a low start-up current, oz9987 can utilize a large value start-up resistor to mini- mize start-up power consumption. the line voltage compensation circuit provides a constant power limit throughout the universal ac input voltage range. applications application diagram ?general lighting ?ac/dc power adapter patents pending. http://www..net/
42 43 oz9988 features ?high frequency dc/dc controller ?1 or 2 cells of nimh or alkaline batteries ?drives either 1 high power white or blue or green led or 2 high power red leds ?1.25mhz xed operating frequency ?over-current, over-voltage and led short circuit protection ?thermal protection ?soft start function general description oz9988 is a high power led driver controller suitable for applications requiring 1 or 2 cell nimh or alkaline batteries. it is used in a high ef ciency boost converter which provides constant current drive for led backlight applications. this highly integrated controller reduces external circuit components in the boost converter, and offers internal feedback compensation for the control loop. applications application diagram ?flashlight ?landscape lighting patents pending. oz9991/91a features ? oz9991: input voltage 4.6v ~ 25.0v; and 1.2mhz xed switching frequency ? oz9991a: input voltage 3.0v ~ 7.0v; and 1mhz xed switching frequency ?high ef ciency dc/dc step down converter ?integrated power mosfet with 1a output ?1mhz xed switching frequency ?internally compensated current mode control ?over-current and thermal protection ?under-voltage lockout ?soft start function general description oz9991/91a are high ef ciency, dc/dc step down converters with an integrated power mosfet that supports 1 string of white leds in series. oz9991/91a utilize current mode control with internal slope compensation to sup- port a wide input voltage range. applications application diagrams ?flashlight ?bicycle lamp patents pending. http://www..net/
44 45 oz9992 features ?quasi-resonant ac/dc converter controller for high brightness leds ?three-level analog dimming control brightness levels using a wall switch (patent pending) ?low start-up current and operating current maximizing conversion ef ciency ?peak current mode control simpli es circuit design ?under-voltage lockout with hysteresis ?minimum off-time control for light-load operation maximizing ef ciency ?constant output power for universal ac input ?provides complete protection functions: - maximum gate drive output at 18.0v - over-voltage protection for ic bias voltage - cycle-by-cycle current limit at current sense - led short circuit protection - over-voltage and thermal protection general description oz9992 is a controller for of ine ac/dc yback converter applications utilizing quasi-resonant power conversion technology. one application using oz9992 is for driving the high power leds. it uses a compensated peak current mode control to regulate the average current through the leds. oz9992 requires very low start-up current, which maximizes the ef ciency of the converter and provides a proprietary (patent pending) dimming technology by turning-on/off the wall switch. applications application diagram ?general lighting patents pending. oz9994 features ?quasi-resonant ac/dc converter controller for high brightness leds ?isolated and non-isolated applications ?three-level pwm brightness control using a wall switch (patent pending) ?low start-up current and operating current maximizing conversion ef ciency ?peak current mode control simpli es circuit design ?under-voltage lockout with hysteresis ?minimum off-time control for light-load operation maximizing ef ciency ?provides complete protection functions - maximum gate drive output at 18v - over-voltage protection for ic bias voltage - cycle-by-cycle current limit at current sense - led short circuit protection - output over-voltage and internal thermal protection general description oz9994 is a controller for of ine ac/dc yback converter applications utilizing quasi-resonant power conversion technology. one application using oz9994 is for driving the high power leds. the controller uses a compensated peak current mode control to regulate the average current of the leds. oz9994 requires very low start-up current which maximizes the ef ciency of the converter. it provides a proprietary (patent pending) dimming technology by turning on/off the wall switch. applications application diagram ?general lighting patents pending. http://www..net/
46 47 oz9995 features ?three-step pwm dimming control by toggling a wall switch (patent pending) ?under-voltage lockout with hysteresis ?constant off-time operation ?output over-current protection ?led short circuit protection ?thermal protection general description oz9995 is an optimized dc/dc controller for driving high power leds used in of ine applications. the ic operates in a constant off-time control mode. oz9995 provides a proprietary (patent pending) three-step pulse width modulation (pwm) dimming control technique by toggling on/off a wall switch, simplifying the replacement of traditional lamps with led lamps without modifying any electrical wiring or the wall switch. applications application diagram ?general lighting patents pending. oz523 features ?supports constant voltage or constant current ?1.5a continuous output current ?0.25 ? internal power mosfet ?stable control loop ?v out from 0.8v to 0.9*v in ?soft start function ?fixed switching frequency ?low current shutdown mode ?over-current protection and thermal protection general description the oz523 is a fast response pwm controller using minimum external components to achieve control loop stability in dc/dc and led driver applications. it supports both constant voltage and constant current applications. oz523 is a non-synchronous step down dc/dc converter with a 0.25 ? integrated mosfet and supports a 1.5a continuous load current with up to 3.2a peak current. the output voltage can be user-de ned from 0.8v up to 0.9*vin using a feedback resistor divider. oz523 can also operate in constant current mode to drive high power led applica- tions. applications application diagram ?general purpose dc/dc converter patents pending. http://www..net/
48 49 www.o2micro.com patents pending. oz524 features ?supports constant voltage or constant current ?3.0a continuous output current ?0.15 ? internal power mosfet ?stable control loop ?v out from 0.8v to 0.9*v in ?soft start function ?fixed switching frequency ?low current shutdown mode ?over-current protection and thermal protection general description the oz524 is a fast response pwm controller using minimum external components to achieve control loop stability in dc/dc and led driver applications. it supports both constant voltage and constant current applications. oz524 is a non-synchronous step down dc/dc converter with a 0.25 ? integrated mosfet and supports a 3.0a continuous load current with up to 3.2a peak current. the output voltage can be user-de ned from 0.8v up to 0.9*vin using a feedback resistor divider. oz524 can also operate in constant current mode to drive high power led applica- tions. applications application diagram ?general purpose dc/dc converter u.s. patent #7,498,793; 7,847,783; and more patents pending. oz526 features ?high frequency dc/dc power converter for leds ?integrated power mosfet ?integrated led current balance control circuit ?user-de ned operation frequency ?drives 1 or 2 strings ?external pwm and analog dimming control ?converter output over-voltage protection ?internal power mosfet over-current protection ?over-current protection for each string ?output short circuit detection ?open diode and thermal protection general description the oz526 is a high ef ciency dc/dc controller with an integrated power mosfet that drives one string or two led strings in parallel con guration, with multiple leds connected in series. it is targeted for netbook and pnd backlight applications. oz526 provides two led current sense inputs in an ?r?con guration for improved backlight reliability. this allows the backlight to remain functioning in the event that any string(s) is damaged during normal operation. the controller receives an external pulse width modulation (pwm) signal for the dimming control function. applications application diagram ?gps ?pnd http://www..net/
50 51 u.s. patent #7,498,793; 7,847,783; and more patents pending. oz527 features ?high power dc/dc power converter ?integrated power n-channel mosfet ?integrated led current balance control circuit ?drives up to 6 strings in parallel ?user-de ned string selection ?time-shift pwm phase dimming control for low audible noise ?operation frequency synchronization ?led open string protection ?output short circuit or open diode protection ?led short circuit protection ?mosfet over-current protection ?shutdown under abnormal condition protection ?thermal protection ?led fault status output general description the oz527 is a high ef ciency dc/dc controller that drives up to six strings con- nected in parallel con guration with multiple leds in each string connected in series. oz527 provides 6 led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that a string(s) is damaged during normal operation. oz527 supports external pulse width modulation (pwm) dimming control. applications application diagram ?gps patents pending. oz528 features ?high power dc/dc power converter ?operation frequency synchronization ?optional spread spectrum operation frequency ?thermal, over-current, and over load protection ?abnormal pulled-up output protection ?led fault status output buck converter ?integrated power mosfet ?current mode control ?soft start function two independent boost converters ?integrated power mosfet ?current mode control ?wide output range: up to 25.0v ?adjustable power on/off delay time ?soft start function negative charge pump ?voltage mode control ?adjustable power on/off delay time general description the oz528 is a lcd panel bias power supply controller and is suitable for gps ap- plication. it generates four voltage rails for a tft lcd panel. it includes a boost con- verter to provide the source voltage, buck converter to provide the logic voltage for the system, boost converter for positive gate voltage and a negative charge-pump driver to provide adjustable regulated output voltages to bias the tft panel. ic has power-on sequencing. the buck converter is the rst to start after the ic is enabled. two boost converters and a negative charge pump are enabled when their corresponding timer reaches approximately 2.0v. applications application diagram ?gps http://www..net/
52 53 u.s. patent #7,847,783; and more patents pending. oz9965 features ?integrated led controller and two (2) dc/dc converters ?user-de ned operation frequency ?wide input voltage range ?thermal protection ?user-de ned shutdown delay time ?led fault status output led controller ?user-de ned boost topology or buck- boost topology ?current mode control ?drives up to 4 strings of leds in parallel ?user-de ned string selection ?integrated led current balance control circuit ?external pwm dimming control ?led open string and short circuit protection ?mosfet over-current protection led controller (cont.) ?over load protection ?output short circuit or open diode protection boost converter ?current mode control ?over-voltage protection ?mosfet over-current protection ?over load protection ?soft start function general purpose converter ?user-de ned negative buck- boost or buck topology ?voltage mode control ?over-voltage and over-load protection ?soft start function general description oz9965 is a wide input range multi-output power management controller for small panel lcd applications. it controls the dc/dc power conversion from a single input supply voltage to provide the power needed to drive an led backlight module, source drivers and gate drivers used in a lcd application. oz9965 includes a high power led driver controller, a boost converter, and one general purpose converter that can be con gured into either a buck or negative buck-boost converter. the led driver supports external pulse width modulation (pwm) dimming, and can drive 3 or 4 led strings, depending on the sel pin voltage setting. applications application diagram ?car tv ?gps u.s. patent #7,498,793; 7,847,783; and more patents pending. oz9990 features ?high power dc/dc power converter controller ?drives up to 4 strings in parallel ?integrated led current balance control circuit ?user-de ned string selection ?operation frequency synchronization ?external pwm dimming control ?time-shift pwm phase dimming control for low audible noise ?led open string protection ?output short circuit and open diode protection ?led short circuit protection ?mosfet over-current protection ?thermal protection ?led fault status output ?soft start function general description oz9990 is a led controller that drives up to four (4) strings connected in parallel con guration, with multiple leds per string connected in series. it provides four (4) led current sense inputs in an ?r?con guration to improve backlight reliability. this allows the backlight to remain functioning in the event that any string (s) is dam- aged during normal operation. oz9990 supports external pulse width modulation (pwm) dimming control, and provides an integrated circuit to balance the current ow through each led string. applications application diagram ?car tv ?gps http://www..net/
54 55 u.s. patent #7,268,520; and more patents pending. oz522 features charger ?550khz switching mode charger for 1 ?4 cell liion or lipolymer batteries ?supports fast charge mode ?wake up charging function for discharged batteries ?built-in charge termination function ?internal safety timer for charger ?92% ef ciency ?automatic battery recharge ?1% constant voltage accuracy ?charge status indication by led ?battery absence detection dc/dc converters ?two switch mode buck converters with under-voltage protection ?2% voltage accuracy ?output protection: - over-current for each dc/dc converter - over-voltage lockout on adapter voltage - under-voltage lockout on battery voltage ?output voltage range of 1.0v to 5.5v ?integrated soft start function, 4ms soft start function at start-up ?on/off control pin general description the oz522 provides a complete charging algorithm to control 1 ?4 cell liion batter- ies, used in portable dvd (pdvd), and other portable electronic equipment. it deliv- ers a wake-up charging current for discharged batteries followed by a fast charging current to minimize the charging time, and keeps the battery regulation voltage with 1% accuracy. a battery temperature sensing scheme allows the battery to be charged within a user-de ned temperature range. the switch mode charger allows use of low ac adapter voltage at high ef ciency. applications application diagram ?pdvd patents pending. oz525 features ?asymmetrical switch mode dc/dc controller ?voltage mode pwm control with adjustable drive output sequence ?complementary drive architecture supporting various topologies ?highly customizable driver sequence to minimize switching loss ?complete protection features: - over-voltage protection (ovp) via vvd pin - two-level over-current protection (ocp) via cs pin - thermal protection via otp pin - brownout protection via bo pin - open loop protection (olp) via fb pin - adjustable shutdown delay timer via timer pin ?fast line feed forward compensation ?adjustable start-up delay time to reduce excessive voltage stress to power components ?user-de ned soft start time general description the oz525 is an energy ef cient, switched mode dc/dc controller designed for switched mode power supply (smps) applications, utilizing a half-bridge topology. high level integration and distinctive features result in a cost effective power supply design, requiring few external components. the controller provides complementary pulse width modulation (pwm) control and enables the designer to customize the drive sequence. such customization, through dedicated pins, ensures high ef ciency and performance in a power supply system by minimizing switching loss. applications application diagram ?general purpose ac/dc converter http://www..net/
56 57 patents pending. oz529 features dc/dc buck converter ?integrates 40v, 3a n-ch power mosfet ?adjustable operation frequency range 200khz ?800khz ?operation frequency synchronization ?system power input under-voltage lockout ?adaptive output voltage following usb output requirement ?thermal protection usb power switch ?independent on/off control ?sustains up to 40v input voltage stress ?up to 1.5a output current capability ?adjustable over-current limit threshold ?built in soft start ?output voltage vs. load current compensation ?reverse current protection under shutdown condition ?usb fault status output general description the oz529 includes a high ef ciency dc/dc buck converter and a high current usb power switch for usb port power supply applications. with current mode dc/dc conversion control and internal compensation, oz529 provides fast line voltage transient response and minimizes application component count. the usb power switch employs a proprietary design technique providing out- put voltage vs. load current compensation and the adaptive buck converter output voltage control functions to achieve a reliable, exible and ef cient solution for high current usb port power supply applications. applications application diagram ?usb port power supply patents pending. oz530 features ?integrated boundary-mode pfc and yback controller ?clamped gate output voltage ?pfc features: - zero current switching (zcs) - cycle-by-cycle current limiting - controlled on-time boost converter ?protection features: - over-voltage protection (ovp) for both controls - open loop protection for both controls - two-level over-current protection (ocp) for yback control ?flyback features: - zero voltage switching (zvs) - fast transient response - minimum off-time control scheme - user-de ned soft start and shutdown delay timer general description the oz530 is an integrated circuit featuring a power factor correction (pfc) control and a dc/dc flyback converter control. its high-level integration simpli es power supply circuit design with minimum circuit components. the pfc portion of oz530 operates under a boundary-mode control regulating a dc output voltage. the yback controller portion of oz530 provides a primary-side control designed to optimize of ine, quasi-resonant (qr), zvs yback converter. applications application diagram ?ac/dc power supply ?pfc http://www..net/
58 59 patents pending. oz531 features ?current mode pwm controller ?built-in high voltage (500v) start-up circuit ?low standby power meets energy star speci cation ?current mode control with frequency foldback under light-load condition ?built-in synchronized slope compensation ?drive current up to 500ma ?leading-edge blanking at current sense ?protections: - under-voltage lockout protection - clamped gate output voltage at 18v - vdd over-voltage protection - cycle-by-cycle current limiting - output over-current and short circuit protection - thermal protection general description the oz531 is a highly integrated current mode pulse width modulation (pwm) con- troller that is ideal for of ine ac/dc yback converter applications. the controller operates at xed frequency of 100khz. with a built-in high voltage start-up circuit, oz531 eliminates the power loss caused by start-up resistors. the driver outputs a soft-drive signal which reduces electromagnetic interference in the converter system. applications application diagram ?ac/dc power adapter company background founded in april 1995, o 2 micro international limited (nasdaq : oiim) designs, develops and markets innovative power management and e-commerce components for the computer, consumer, industrial/automotive, and communications markets. o 2 micro maintains an extensive portfolio of intellectual property, and has numerous trademark applications and copyright registrations. the companys extensive list of customers includes most of the worlds leading electronics manufacturers of computer, consumer, industrial and communication products. for additional information, including sales office locations, please visit the o 2 micro web site at www.o2micro.com . copyright ?2010 by o 2 micro. all rights reserved. po 2 wer, the o 2 micro logo, o 2 micro, intelligent inverter, and combinations thereof are registered trademarks of o 2 micro. all other trademarks are the property of their respective owners. r-022011 http://www..net/
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