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innovative power tm - 1 - www.active-semi.com copyright ? 2011 active-semi, inc. features ? up to 40v input voltage ? up to 1.5a constant output current ? output voltage up to 12v ? patent pending active cc constant current control ? integrated current control improves efficiency, lowers cost, and reduces component count ? resistor programmable outputs ? current limit from 400ma to 1500ma ? patented cable compensation from 0 ? to 0.5 ? ? 7.5% cc accuracy ? compensation of input/ output voltage change ? temperature compensation ? independent of inductance and inductor dcr ? 2% feedback voltage accuracy ? up to 93% efficiency ? 210khz switching frequency eases emi design ? advanced feature set ? integrated soft start ? thermal shutdown ? secondary cycle-by-cycle current limit ? protection against shorted iset pin ? sop-8 package applications ? car charger ? rechargeable portable devices ? general-purpose cc/cv supply general description ACT4515 is a wide input voltage, high efficiency active cc step-down dc/dc converter that operates in either cv (c onstant output voltage) mode or cc (constant output current) mode. ACT4515 provides up to 1.5a output current at 210khz switching frequency. active cc is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. active cc eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and high- brightness led drive for architectural lighting. the ACT4515 achieves higher efficiency than traditional constant current switching regulators by eliminating the sense resistor and its associated power loss. protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit. the devices are available in a sop-8 package and require very few external devices for operation. ACT4515 wide-input sensorless cc/cv step-down dc/dc converter a ctive-semi rev 4, 21-jul-11 ACT4515-001 cc/cv curve vs. load current 6.0 5.0 4.0 3.0 2.0 1.0 0.0 output voltage (v) i out current (ma) 0 250 500 750 1000 1250 1500 v 0ut = 5v v in = 12v v in = 24v
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 2 - www.active-semi.com copyright ? 2011 active-semi, inc. ordering information part number temperature range package pins packing ACT4515sh-t -40c to 85c sop-8 8 tape & reel pin configuration pin descriptions pin name description 1 hsb high side bias pin. this provides power to the internal high-side mosfet gate driver. connect a 10nf capacitor from hsb pin to sw pin. 2 in power supply input. bypass this pin with a 10f ceramic capacitor to gnd, placed as close to the ic as possible. 3 sw power switching output to external inductor. 4 gnd ground. connect this pin to a large pcb copper area for best heat dissipation. return fb, comp, and iset to this gnd, and con nect this gnd to power gnd at a single point for best noise immunity. 5 fb feedback input. the voltage at this pin is re gulated to 0.808v. connect to the resistor divider between output and gnd to set the output voltage. 6 comp error amplifier output. this pi n is used to compensate the converter. 7 en enable input. en is pulled up to 5v with a 4 a current, and contains a precise 0.8v logic threshold. drive this pin to a logic-high or leave unconnected to enable the ic. drive to a logic-low to disable the ic and enter shutdown mode. 8 iset output current setting pin. connect a resi stor from iset to gnd to program the output current. sop-8 8 7 5 1 2 3 4 in sw gnd iset en comp fb ACT4515 6 hsb
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 3 - www.active-semi.com copyright ? 2011 active-semi, inc. absolute maximum ratings c parameter value unit in to gnd -0.3 to 40 v sw to gnd -1 to v in + 1 v hsb to gnd v sw - 0.3 to v sw + 7 v fb, en, iset, comp to gnd -0.3 to + 6 v junction to ambient thermal resistance 105 c/w operating junction temperature -40 to 150 c storage junction temperature -55 to 150 c lead temperature (soldering 10 sec.) 300 c c : do not exceed these limits to prevent damage to the device. exposure to absolute maximum rati ng conditions for long periods m ay affect device reliability.
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 4 - www.active-semi.com copyright ? 2011 active-semi, inc. parameter test conditions min typ max unit input voltage 10 40 v v in uvlo turn-on voltage input vo ltage rising 9.05 9.35 9.65 v v in uvlo hysteresis input voltage falling 1.1 v v in ovp turn-off voltage input vo ltage rising 32.5 34.5 36.5 v v in ovp hysteresis input vo ltage falling 1.75 v v en = 3v, v fb = 1v 1.0 ma v en = 3v, v o = 5v, no load 2.5 ma shutdown supply current v en = 0v 75 100 a feedback voltage 792 808 824 mv internal soft-start time 400 s error amplifier transconductance v fb = v comp = 0.8v, ? i comp = 10a 650 a/v error amplifier dc gain 4000 v/v switching frequency v fb = 0.808v 190 210 240 khz foldback switching frequency v fb = 0v 30 khz maximum duty cycle 88 % minimum on-time 200 ns comp to current limit transconductance v comp = 1.2v 1.75 a/v switch current limit duty = 50% 1.8 a slope compensation duty = d max 0.75 a iset voltage 1 v iset to iout dc room temp current gain iout / iset 25000 a/a cc controller dc accuracy r iset = 19.6k ? 1274 1300 1326 ma en threshold voltage en pin rising 0.75 0.8 0.85 v en hysteresis en pin falling 80 mv en internal pull-up current 4 a high-side switch on-resistance 0.3 ? sw off leakage current v en = v sw = 0v 1 10 a thermal shutdown temperature temperature rising 155 c standby supply current electrical characteristics (v in = 14v, t a = 25c, unless otherwise specified.)
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 5 - www.active-semi.com copyright ? 2011 active-semi, inc. functional block diagram functional description cv/cc loop regulation as seen in functional block diagram , the ACT4515 is a peak current mode pulse width modulation (pwm) converter with cc and cv control. the converter operates as follows: a switching cycle starts when the rising edge of the oscillator clock output ca uses the high-side power switch to turn on and the low-side power switch to turn off. with the sw side of the inductor now connected to in, the inductor current ramps up to store energy in the magnetic field. the inductor current level is measured by the current sense amplifier and added to the oscillator ramp signal. if the resulting summation is higher than the comp voltage, the output of the pwm comparator goes high. when this happens or when oscillator clock output goes low, the high-side power switch turns off. at this point, the sw side of the inductor swings to a diode voltage below ground, causing the inductor current to decrease and magnetic energy to be transferred to output. this state continues until the cycle starts again. the high-side power switch is driven by logic using hsb as the positive rail. this pin is charged to v sw + 5v when the low-side power switch turns on. the comp voltage is the integration of the error between fb input and the internal 0.808v reference. if fb is lower than the reference voltage, comp tends to go higher to increase current to the ou tput. output current will increase until it reaches the cc limit set by the iset resistor. at this point, t he device will transition from regulating output voltage to regulating output current, and the output voltage will drop with increasing load. the oscillator normally switches at 210khz. however, if fb voltage is less than 0.6v, then the switching frequency decreases until it reaches a typical value of 30khz at v fb = 0.15v. enable pin the ACT4515 has an enable input en for turning the ic on or off. the en pin contains a precision 0.8v comparator with 75mv hysteresis and a 4a pull-up current source. the comparator can be used with a resistor divider from v in to program a startup voltage higher than the normal uvlo value. it can be used with a resistor divider from v out to disable charging of a deeply discharged battery, or it can be used with a resistor divider containing a thermistor to provide a temperature-dependent shutoff protection for over temperature battery. the thermistor should be thermally coupled to the battery pack for this usage. if left floating, the en pin will be pulled up to roughly 5v by the internal 4a current source. it can be driven from standard logic signals greater than 0.8v, or driven with open-drain logic to provide digital on/off control. thermal shutdown the ACT4515 disables switching when its junction temperature exceeds 155c and resumes when the temperature has dropped by 20c.
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 6 - www.active-semi.com copyright ? 2011 active-semi, inc. ? ? ? ? ? ? ? = 1 v 808 . 0 v r r out 2 fb 1 fb (1) r fb1 r fb2 v out ACT4515 fb applications information output voltage setting figure 1: output voltage setting figure 1 shows the connections for setting the output voltage. select the proper ratio of the two feedback resistors r fb1 and r fb2 based on the output voltage. typically, use r fb2 10k ? and determine r fb1 from the following equation: cc current setting ACT4515 constant current value is set by a resistor connected between the iset pin and gnd. the cc output current is linearly proportional to the current flowing out of the iset pin. the voltage at iset is roughly 1v and the current gain from iset to output is roughly 25000 (25ma/1a). to determine the proper resistor for a desired current, please refer to figure 2 below. figure 2: curve for programming output cc current cc current line compensation when operating at cons tant current mode, the current limit increase slightly with input voltage. for wide input voltage applications, a resistor r c is added to compensate line change and keep output high cc accuracy, as shown in figure 3. figure 3: iutput line compensation inductor selection the inductor maintains a continuous current to the output load. this inductor cu rrent has a ripple that is dependent on the inductance value: higher inductance reduces the peak-to-peak ripple current. the trade off for high inductance value is the increase in inductor core size and series resistance, and the reduction in current handling capability. in general, select an inductance value l based on ripple current requirement: where v in is the input voltage, v out is the output voltage, f sw is the switching frequency, i loadmax is the maximum load current, and k ripple is the ripple factor. typically, choose k ripple = 30% to correspond to the peak-to-peak ripple current being 30% of the maximum load current. with a selected inductor value the peak-to-peak inductor current is estimated as: the peak inductor current is estimated as: output current vs. r iset ACT4515-002 1800 1600 1200 1000 800 600 400 200 1400 0 output current (ma) r iset (k ? ) 0 10 20 30 40 50 60 80 90 70 (2) ( ) ripple loadmax sw in out in out k i f v v v v l _ = (3) ( ) sw in out in out pk lpk f v l v v v i = _ _ pk lpk loadmax lpk _ i 2 1 i i + = (4) r c r iset in v in iset ACT4515
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 7 - www.active-semi.com copyright ? 2011 active-semi, inc. (6) esr ripple outmax ripple r k i v = out 2 sw in lc f 28 v + applications information cont?d the selected inductor should not saturate at i lpk. the maximum output current is calculated as: l lim is the internal current limit, which is typically 2.5a, as shown in electrical characteristics table. external high voltage bias diode it is recommended that an external high voltage bias diode be added when the system has a 5v fixed input or the power supply generates a 5v output. this helps improve the efficiency of the regulator. the high voltage bias diode can be a low cost one such as in4148 or bat54. figure 4: external high voltage bias diode this diode is also recommended for high duty cycle operation and high output voltage applications. input capacitor the input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the converter. a low esr capacitor is highly recommended. since large current flows in and out of this capacitor during switching, its esr also affects efficiency. the input capacitance needs to be higher than 10f. the best choice is the ceramic type, however, low esr tantalum or electrolytic types may also be used provided that the rms ripple current rating is higher than 50% of the output current. the input capacitor should be placed close to the in and g pins of the ic, with the shortest traces possible. in the case of tantalum or electrolytic types, they ca n be further away if a small parallel 0.1f ceramic capacitor is placed right next to the ic. output capacitor the output capacitor also needs to have low esr to keep low output voltage ripple. the output ripple voltage is: where i outmax is the maximum output current, k ripple is the ripple factor, r esr is the esr of the output capacitor, f sw is the switching frequency, l is the inductor value, and c out is the output capacitance. in the case of cerami c output capacitors, r esr is very small and does not contribute to the ripple. therefore, a lower capacitance value can be used for ceramic type. in the case of tantalum or electrolytic capacitors, the ripple is dominated by r esr multiplied by the ripple current. in that case, the output capacitor is chosen to have sufficiently low esr. for ceramic output capacitor, typically choose a capacitance of about 22f. for tantalum or electrolytic capacitors, choose a capacitor with less than 50m ? esr. rectifier diode use a schottky diode as the rectifier to conduct current when the high-side power switch is off. the schottky diode must have current rating higher than the maximum output current and a reverse voltage rating higher than the maximum input voltage. hsb sw ACT4515 10nf 5v (5) pk lpk lim outmax i 2 1 i i _ _ =
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 8 - www.active-semi.com copyright ? 2011 active-semi, inc. v out c out r comp c comp c comp2 c 2.5v 22 f ceramic 8.2k ? 2.2nf none 3.3v 22 f ceramic 12k ? 1.5nf none 5v 22 f ceramic 15k ? 1.5nf none 2.5v 47 f sp cap 15k ? 1.5nf none 3.3v 47 f sp cap 15k ? 1.8nf none 5v 47 f sp cap 15k ? 2.7nf none 2.5v 470 f/6.3v/30m ? 15k ? 15nf 47pf 3.3v 470 f/6.3v/30m ? 15k ? 22nf 47pf 5v 470 f/6.3v/30m ? 15k ? 27nf 47pf ? ? ? ? ? ? ? ? ? out out 6 esrcout v 012 . 0 , c 10 1 . 1 min r (15) ( ? ) (16) comp esrcout out 2 comp r r c c = out out 5 comp c v 10 2 . 1 c ? = (f) (14) (13) (f) comp 5 comp r 10 8 . 1 c ? = (12) ( ? ) out out 8 c v 10 75 . 2 = v 808 . 0 g g 10 f c v 2 r comp ea sw out out comp = (11) comp2 comp 3 p c r 2 1 f = (10) comp2 comp 1 z c r 2 1 f = (9) out out out 2 p c v 2 i f = (8) comp vea ea 1 p c a 2 g f = (7) comp vea out vdc g a i v 808 . 0 a = comp c comp2 c comp r comp ACT4515 c stability compensation figure 5: stability compensation c : c comp2 is needed only for high esr output capacitor the feedback loop of the ic is stabilized by the components at the comp pin, as shown in figure 3. the dc loop gain of the system is determined by the following equation: the dominant pole p1 is due to c comp : the second pole p2 is the output pole: the first zero z1 is due to r comp and c comp : and finally, the third pole is due to r comp and c comp2 (if c comp2 is used): the following steps should be used to compensate the ic: step 1. set the cross over frequency at 1/10 of the switching frequency via r comp : step 2. set the zero f z1 at 1/4 of the cross over frequency. if r comp is less than 15k ? , the equation for c comp is: if r comp is limited to 15k ? , then the actual cross over frequency is 3.4 / (v out c out ). therefore: step 3. if the output capacitor?s esr is high enough to cause a zero at lower than 4 times the cross over frequency, an additional compensation capacitor c comp2 is required. the condition for using c comp2 is: and the proper value for c comp2 is: though c comp2 is unnecessary when the output capacitor has sufficiently low esr, a small value c comp2 such as 100pf may improve stability against pcb layout parasitic effects. table 2 shows some calculated results based on the compensation method above. table 1: typical compensation for different output voltages and output capacitors c : c comp2 is needed for high esr output capacitor. c comp2 47pf is recommended. cc loop stability the constant-current control loop is internally compensated over the 400ma-1500ma output range. no additional external compensation is required to stabilize the cc current. output cable resistance compensation to compensate for resistive voltage drop across the charger's output cable, the ACT4515 integrates a
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 9 - www.active-semi.com copyright ? 2011 active-semi, inc. stability compensation cont?d simple, user-programmable cable voltage drop compensation using the impedance at the fb pin. use the curve in figure 5 to choose the proper feedback resistance values for cable compensation. r fb1 is the high side resistor of voltage divider. in the case of high r fb1 used, the frequency compensation needs to be adjusted correspondingly. as show in figure 7, adding a capacitor in paralled with r fb1 or increasing the compensation capacitance at comp pin helps the system stability. figure 6: cable compensation at various resistor divider values figure 7: frequency compensation for high r fb1 pc board layout guidance when laying out the printed circuit board, the following checklist should be used to ensure proper operation of the ic. 1) arrange the power components to reduce the ac loop size consisting of c in , in pin, sw pin and the schottky diode. 2) place input decoupling c eramic capacitor c in as close to in pin as possible. c in is connected power gnd with vias or short and wide path. 3) return fb, comp and iset to signal gnd pin, and connect the signal gnd to power gnd at a single point for best noise immunity. 4) use copper plane for power gnd for best heat dissipation and noise immunity. 5) place feedback resistor close to fb pin. 6) use short trace connecting hsb-c hsb -sw loop 7) reduce sw pad size figure 8 shows an example of pcb layout. figure 9 and figure 10 give two typical car charger application schematics and associated bom list. ACT4515-003 0.48 0.4 0.32 0.24 0.16 0.08 0 0.56 0.64 delta output voltage (v) output current (ma) 0 250 500 750 1000 1250 1500 delta output voltage vs. output current r f b 1 = 3 0 0 k r f b 1 = 2 0 0 k r f b 1 = 1 5 0 k r f b 1 = 1 0 0 k r f b 1 = 68 k r f b 1 = 1 2 k v in = 14v v 0ut = 5v i iset = 1.5a r f b 1 = 2 4 0 k figure 8: pcb layout
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 10 - www.active-semi.com copyright ? 2011 active-semi, inc. figure 9: typical application circuit for 5v/1.2a car charger table 2: bom list for 5v/1.2a car charger item reference description manufacturer qty 1 u1 ic, ACT4515sh, sop-8 active-semi 1 2 c1 capacitor, electrolytic, 47f/50v, 6.3 7mm murata, tdk 1 3 c2 capacitor, ceramic, 2.2f/50v, 1206, smd murata, tdk 1 4 c3 capacitor, ceramic, 1.5nf/6.3v, 0603, smd murata, tdk 1 5 c4 capacitor, ceramic, 10nf/50v, 1206, smd murata, tdk 1 6 c5 capacitor, electrolytic, 100f/10v, 6.3 7mm murata, tdk 1 9 l1 68h, 1.5a, 20%, smd cdrh125-680m sumida 1 10 d1 diode, schottky, 40v/2a, sb240, do-15 diodes 1 12 r1 chip resistor, 20k ? , 0603, 1% murata, tdk 1 13 r2 chip resistor, 52k ? , 0603, 1% murata, tdk 1 14 r3 chip resistor, 12k ? , 0603, 5% murata, tdk 1 15 r4 chip resistor, 10k ? , 0603, 1% murata, tdk 1 11 d2 diode, 75v/150ma, ll4148 good-ark 1 7 c6 capacitor, ceramic, 1f/10v, 0603, smd murata, tdk 1 8 c7 (optional) capacitor, ceramic, 220pf/6.3v, 0603 murata, tdk 1
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 11 - www.active-semi.com copyright ? 2011 active-semi, inc. figure 10: typical application circuit for 5v/0.75a car charger table 3: bom list for 5v/0.75a car charger item reference description manufacturer qty 1 u1 ic, ACT4515sh, sop-8 active-semi 1 2 c1 capacitor, electrolytic, 47f/50v, 6.3 7mm murata, tdk 1 3 c2 capacitor, ceramic, 2.2f/50v, 1206, smd murata, tdk 1 4 c3 capacitor, ceramic, 1.5nf/6.3v, 0603, smd murata, tdk 1 5 c4 capacitor, ceramic, 10nf/50v, 1206, smd murata, tdk 1 6 c5 capacitor, electrolytic, 100f/10v, 6.3 7mm murata, tdk 1 9 l1 82h, 1a, 20%, smd 1058-mgdn6-00013 tyco electronics 1 10 d1 diode, schottky, 40v/2a, sb240, do-15 diodes 1 12 r1 chip resistor, 33k ? , 0603, 1% murata, tdk 1 13 r2 chip resistor, 52k ? , 0603, 1% murata, tdk 1 14 r3 chip resistor, 12k ? , 0603, 5% murata, tdk 1 15 r4 chip resistor, 10k ? , 0603, 1% murata, tdk 1 11 d2 diode, 75v/150ma, ll4148 good-ark 1 7 c6 capacitor, ceramic, 1f/10v, 0603, smd murata, tdk 1 8 c7 (optional) capacitor, ceramic, 220pf/6.3v, 0603 murata, tdk 1 ACT4515 hsb in en comp fb sw iset enable v in up to 40v 5v/750ma gnd c1 47f 50v r1 33k r3 12k c3 1.5nf c7 220pf r4 10k d1 sb240 c5 100f 10v r2 52k ? l1 82h c4 10nf/50v d2 ll4148 c6 1f 10v c2 2.2f 50v
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 12 - www.active-semi.com copyright ? 2011 active-semi, inc. typical performanc e characteristics ACT4515-004 efficiency (%) load current (ma) 10 100 1000 10000 ACT4515-007 1000 900 800 700 600 500 400 cc current (ma) temperature (c) -20 10 40 70 100 130 ACT4515-009 peak current limit vs. duty cycle maximum cc current (ma) 2500 2250 2000 1750 1500 1250 1000 750 500 250 0 duty cycle 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 100 90 80 70 60 50 40 efficiency vs. load current cc current vs. temperature v in = 10v v in = 12v v out = 5v input voltage (v) 10 15 20 25 30 35 ACT4515-005 switching frequency vs. input voltage switching frequency (khz) 250 230 210 190 170 150 130 110 v in = 12v r iset = 33k ? ACT4515-008 cc current vs. input voltage cc current (ma) 1000 900 800 700 600 500 400 input voltage (v) 10 14 18 22 26 30 34 r iset = 33k ? v in = 24v (circuit of figure 7, i iset = 0.9a, l = 82h, c in = 10f, c out = 22f, t a = 25c, unless otherwise specified.) ACT4515-006 switching frequency vs. feedback voltage switching frequency (khz) 260 210 160 110 60 10 feedback voltage (mv) 0 100 200 300 400 500 600 700 800 900
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 13 - www.active-semi.com copyright ? 2011 active-semi, inc. shutdown current vs. input voltage (en pulled low) typical performance ch aracteristics cont?d ACT4515-010 140 120 100 80 60 40 20 0 shutdown current (a) ACT4515-011 standby supply current vs. input voltage standby supply current (a) 2000 1800 1600 1400 1200 1000 800 600 400 200 0 ACT4515-012 reverse leakage current (v in floating) reverse leakage current (a) 100 80 60 40 20 0 v out (v) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 input voltage (v) 0 5 10 15 20 25 30 35 40 input voltage (v) 0 5 10 15 20 25 30 35 40 start up into cv load sw vs. output voltage ripples start up into cv load ACT4515-013 ACT4515-014 ACT4515-015 v 0ut = 5v cv = 3.2v i iset = 0.9a v in = 12v ch1: i out , 500ma/div ch2: v out , 2v/div time: 200s/div ch1: i out , 500ma/div ch2: v out , 2v/div time: 200s/div v in = 12v v 0ut = 5v i 0ut = 0.9a ch1 ch2 ch1: sw, 10v/div ch2: v out_ripple , 50mv/div time: 2s/div v 0ut = 5v cv = 3.2v i iset = 0.9a v in = 24v ch1 ch2 ch1 ch2 (circuit of figure 7, i iset = 0.9a, l = 82h, c in = 10f, c out = 22f, t a = 25c, unless otherwise specified.)
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 14 - www.active-semi.com copyright ? 2011 active-semi, inc. sw vs. output voltage ripples typical performance ch aracteristics cont?d (circuit of figure 7, i iset = 0.9a, l = 82h, c in = 10f, c out = 22f, t a = 25c, unless otherwise specified.) ACT4515-016 ACT4515-017 start up with en ACT4515-018 load step waveforms ACT4515-019 short circuit ACT4515-020 ACT4515-021 v in = 24v v 0ut = 5v i 0ut = 0.9a ch1 ch2 ch1: sw, 10v/div ch2: v ripple , 50mv/div time: 2s/div v in = 12v v 0ut = 5v i 0ut = 0.9a ch1 ch2 ch1: en, 1v/div ch2: v out , 1v/div time: 10ms/div start up with en ch1 ch2 ch1: en, 1v/div ch2: v out , 1v/div time: 10ms/div v in = 12v v 0ut = 5v i iset = 0.9a ch1 ch2 ch1: i out , 500ma/div ch2: v out , 500mv/div time: 100 s/div load step waveforms v in = 24v v 0ut = 5v i iset = 0.9a ch1 ch2 ch1: i out , 500ma/div ch2: v out , 500mv/div time: 100 s/div v in = 12v v 0ut = 5v i iset = 0.9a ch1 ch2 ch1: v out , 2v/div ch2: i out , 1a/div ch3: sw time: 20s/div v in = 24v v 0ut = 5v i iset = 0.9a ch3
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 15 - www.active-semi.com copyright ? 2011 active-semi, inc. typical performance ch aracteristics cont?d ACT4515-022 short circuit v in = 24v v 0ut = 5v i iset = 0.9a ch1 ch2 ch1: v out , 2v/div ch2: i out , 1a/div ch3: sw time: 20s/div ACT4515-023 short circuit recovery v in = 12v v 0ut = 5v i iset = 0.9a ch1 ch2 ch1: v out , 2v/div ch2: i out , 1a/div ch3: sw time: 20s/div ACT4515-024 short circuit recovery v in = 24v v 0ut = 5v i iset = 0.9a ch1 ch2 (circuit of figure 7, i iset = 0.9a, l = 82h, c in = 10f, c out = 22f, t a = 25c, unless otherwise specified.) ch3 ch3 ch3 ch1: v out , 2v/div ch2: i out , 1a/div ch3: sw time: 20s/div
ACT4515 rev 4, 21-jul-11 active- semi innovative power tm - 16 - www.active-semi.com copyright ? 2011 active-semi, inc. package outline sop-8 package outline and dimensions symbol dimension in millimeters dimension in inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.190 0.250 0.007 0.010 d 4.700 5.100 0.185 0.201 e 3.800 4.000 0.150 0.157 e1 5.800 6.300 0.228 0.248 e 1.270 typ 0.050 typ l 0.400 1.270 0.016 0.050 0 8 0 8 a a2 a1 l ? c e d e1 b e active-semi, inc. reserves the right to modify the circuitry or specifications without notice. user s should evaluate each product to make sure that it is suitable for their applicat ions. active-semi products are not intended or authorized for use as critical components in life-support dev ices or systems. active-semi, inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. active-semi and its logo are trademarks of active-semi, inc. for more information on this and other products, contact sales@active-semi.com or visit http://www.active-semi.com . ? is a registered trademark of active-semi.

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