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july 2000 preliminary ML4835 * compact fluorescent electronic dimming ballast controller general description the ML4835 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast especially tailored for a compact fluorescent lamp (cfl). the bi-cmos ML4835 contains controllers for boost type power factor correction as well as for a dimming ballast with end-of-lamp life detection. the pfc circuits uses a new , simple pfc topology which requires only one loop for compensation. in addition, this pfc can be used with either peak- or average-current mode. this system produces a power factor of better than 0.99 with low input current thd. the ballast controller section provides for programmable starting sequence with individual adjustable preheat and lamp out-of-socket interrupt times. the ML4835 provides a shut down for both pfc and ballast controllers in the event of end-of-life for the cfl. block diagram features n power detect for end-of-lamp-life detection n low distortion , high efficiency continuous boost, peak or average current sensing pfc section n leading- and trailing-edge synchronization between pfc and ballast n one to one frequency operation between pfc and ballast n programmable start scenario for rapid/instant start lamps n triple frequency control network for dimming or starting to handle various lamp sizes n programmable restart for lamp out condition to reduce ballast heating. n internal over-temperature shutdown n pfc over-voltage comparator eliminates output runaway due to load removal n low start-up current; < 0.55ma 7 r set 9 r t /c t 8 r t2 13 c ramp 4 pifbo 3 pifb 2 peao 1 pvfb/ovp 12 pwdet 10 interrupt 5 lamp fb 6 leao 17 out a 16 out b 18 pfc out 15 pgnd 11 r x /c x 19 v cc 20 ref 14 agnd output drivers pre-heat and interrupt timers lamp out detect and automatic lamp restart under-voltage and thermal shutdown end-of-lamp detect and power shutoff anti-flash compensation and power dimming level interface control and gating logic three-frequency control sequencer vco variable frequency oscillator power factor controller (* indicates part is end of life as of july 1, 2000) rev. 1.0 10/12/2000
ML4835 2 rev. 1.0 10/12/2000 pin configuration pin description pin name function 1 pvfb/ovp inverting input to the pfc error amplifier and ovp comparator input. 2 peao pfc error amplifier output and compensation node 3 pifb senses the inductor current and peak current sense point of the pfc cycle by cycle current limit 4 pifbo output of the current sense amplifier. placing a capacitor to ground will average the inductor current. 5 lamp fb inverting input of the lamp error amplifier, used to sense and regulate lamp arc current. also the input node for dimmable control. 6 leao output of the lamp current error transconductance amplifier used for lamp current loop compensation 7r set external resistor which sets oscillator f max , and r x /c x charging current 8r t2 oscillator timing component to set start frequency 9r t /c t oscillator timing components pin name function 10 interrupt input used for lamp-out detection and restart. a voltage less than 1v will reset the ic and cause a restart after a programmable interval. 11 r x /c x sets the timing for preheat and interrupt. 12 pwdet lamp output power detection 13 c ramp integrated voltage of the error amplifier out 14 agnd analog ground 15 pgnd po wer ground. 16 out b ballast mosfet driver output 17 out a ballast mosfet driver output 18 pfc out power factor mosfet driver output 19 v cc positive supply voltage 20 ref buffered output for the 7.5v reference 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 ML4835 20-pin soic (s20) 20-pin dip (p20) pvfb/ovp peao pifb pifbo lamp fb leao r set r t2 r t /c t interrupt ref v cc pfc out out a out b pgnd agnd c ramp pwdet r x /c x
ML4835 rev. 1.0 10/12/2000 3 absolute maximum ratings absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. supply current (i cc) ............................................................. 65ma output current, source or sink (out a, out b, pfc out) dc ........................... 250ma pifb input voltage ............................................ C3v to 2v maximum forced voltage (peao, leao) ............................................ C0.3v to 7.7v maximum forced current (peao, leao) ...................................................... 20ma junction temperature .............................................. 150oc storage temperature range ...................... C65oc to 150oc lead temperature (soldering, 10 sec) ..................... 260oc thermal resistance ( q ja ) ML4835cp .......................................................... 65oc/w ML4835cs .......................................................... 80oc/w operating conditions temperature range ....................................... 0c to 85c electrical characteristics unless otherwise specified, v cc = v ccz C0.5v, r set = 11.8k w , r t = 15.4k w , r t2 = 67.5k w , c t = 1.5nf, t a = operating temperature range (note 1) symbol parameter conditions min typ max units lamp current amplifier (lamp fb, leao) input bias current -0.3 -1.0 a small signal transconductance 35 75 105 w input bias voltage -0.3 5.0 v output low lamp fb = 3v, r l = 0.2 0.4 v output high lamp fb = 2v, r l = 7.1 7.5 v source current lamp fb = 0v, leao = 6v -80 -220 a sink current lamp fb = 5v, leao = 0.3v 80 220 a pfc voltage feedback amplifier ( peao, pvfb/ovp) input bias current -0.3 -1.0 a small signal transconductance 35 75 105 w input bias voltage -0.3 5.0 v output low pvfb = 3v, r l = 0.2 0.4 v output high pvfb = 2v, r l = 6.4 6.8 v source current pvfb = 0v, peao = 6v -80 220 a sink current pvfb = 5v, peao = 0.3v 80 220 a pfc current-limit comparator (pifb) current-limit threshold -0.9 -1.0 -1.1 v propagation delay 100mv step and 100mv overdrive 100 ns pfc ovp comparator ovp threshold 2.65 2.75 2.85 v hysteresis 0.14 0.20 0.30 v propagation delay 1.4 s
ML4835 4 rev. 1.0 10/12/2000 electrical characteristics (continued) symbol parameter conditions min typ max units oscillator initial accuracy (f min )t a = 25oc 39.2 40 40.8 khz voltage stability (f min )v ccz C 4v < v cc < v ccz C 0.5v 0.3 % temperature stability (f min ) 0.3 % total variation (f min ) line, temperature 39.2 40.8 khz initial accuracy (start) t a = 25oc 49 50 51 khz voltage stability (start) 0.3 % temparature stability (start) 0.3 % total variation (start) line, temperature 49 51 khz ramp valley to peak 2.5 v initial accuracy (preheat) ta = 25oc 60.8 64 67.2 khz total variation (preheat) line, temperature 60.8 64 67.2 khz c t discharge current v rtct = 2.5v 6.0 7.5 9.0 ma output drive deadtime c t = 1.5nf 0.7 us reference buffer output voltage t a = 25oc, i o = 0ma 7.4 7.5 7.6 v line regulation v ccz C 4v < v cc < v ccz C 0.5v 10 25 mv load regulation 1ma < i o < 10ma 2 15 mv temperature stability 0.4 % total variation line, load, temperature 7.35 7.65 v long term stabilty tj=125oc, 1000 hrs 5 mv short circuit current 40 ma r set voltage 2.4 2.5 2.6 v
ML4835 rev. 1.0 10/12/2000 5 electrical characteristics (continued) symbol parameter conditions min typ max units preheat and interrupt timer (r x = 346k w w w w w , c x = 10f) initial preheat period 0.86 s subsequenct preheat period 0.72 s interrupt period 5.9 s r x /c x charging current -50 -54 -58 a r x /c x open circuit voltage 0.4 0.7 1.0 v r x /c x maximum voltage 7.0 7.3 7.8 v preheat lower threshold 1.6 1.75 1.9 v preheat upper threshold 4.4 4.65 4.9 v start period end threshold 6.2 6.6 6.9 v interrupt disable threshold 1.1 1.25 1.4 v hysteresis 0.16 0.26 0.36 v input bias current 1a power shutdown power shutdown voltage 0.9 1 1.1 v outputs (out a, out b, pfc out) output voltage low i out = 20ma 0.1 0.2 v i out = 200ma 1.0 2.0 v output voltage high i out = 20ma v cc -0.2 v cc -0.1 v output voltage high i out = 200ma v cc -2.0 v cc -1.0 v output voltage low in uvlo i out = 10ma, v cc < v cc start 0.2 v output rise and fall time cl=1000pf 50 ns under voltage lockout and bias circuits ic shunt voltage (v ccz ) icc=15ma 14.0 14.8 15.5 v start-up threshold (v cc start )v ccz -1.5 v ccz -1.0 v ccz -0.5 v hysteresis 3.0 3.7 4.4 v start-up current v cc start C0.2v 350 550 a interrupt current (v cc C0.5v), interrupt = 0v 500 750 a operating current (v cc C0.5v) 5.5 8.0 ma shutdown temperature 130 oc hysteresis 30 oc note 1: limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions.
ML4835 6 rev. 1.0 10/12/2000 functional description the ML4835 consists of peak or average current controlled continuous boost power factor front end section with a flexible ballast control section. start-up and lamp- out retry timing are controlled by the selection of external timing components, allowing for control of a wide variety of different lamp types. the ballast section controls the lamp power using frequency modulation (fm) with additional programmability provided to adjust the vco frequency range. this allows for the ic to be used with a variety of different output networks. figure 1 depicts a detailed block diagram of ML4835. the ML4835 provides several safety features. see the corresponding sections for more details: ? end-of-lamp life detection to detect eol and shut-off lamps; see end of life section. ? thermal shutdown for temperature sensing extremes; see ic bias, under-voltage lockout and thermal shutdown section. ? relamping starting with anti-flash for programmable restart for lamp out conditions while minimizing flashing when powering from full power to dimming levels; see starting, re-start, preheat and interrupt section figure 1. detailed block diagram v cc 19 ref 20 agnd 14 c ramp 13 pvfb/ovp 1 peao 2 pifb pifbo 4 pfc out 18 r set 7 lamp fb 5 leao 6 rt 2 8 interrupt 10 pwdet 12 pgnd 15 out b 16 out a 17 ref C + 14v + C 6.75v q q r s q q t + C temp 130oc/100oc + C 1.25v/1v r x /c x 6.75v/1.25v 2.5v + C 1.0v q q s r C + C + + C 4.75v/ 1.75v + C pvfb 2.75v + C C1v + C 3 r s q q r s q q C + 2.5v v to i 2 clk1 clk r x /c x 11 pfc controller ovp ilim uvlo ref_ok preheat thermal shutdown r t /c t 9 oscillator v to i v to i comp
ML4835 rev. 1.0 10/12/2000 7 figure 3. ML4835 pfc controller section functional description (continued) the ML4835 implements a triple frequency operation scheme: programmable three-frequency sequence for pre- heat, ignition, and dimming, that extends lamp life, simplifies lamp network design, and starts lamps at any dimming level without flashing. this addresses the need for a high-q network for starting sequence and low-q network for operation, minimizing parasitic losses and improving overall power efficiency. the values for the pre-heat, start, operation, and restart can be programmed or selected (figure 2). power factor section the ML4835 power factor section is a peak or average current sensing boost mode pfc control circuit in which only voltage loop compensation is needed. it is simpler than a conventional average current control method. it consists of a voltage error amplifier, a current sense amplifier (no compensation is needed), an integrator, a comparator, and a logic control block. in the boost topology, power factor correction is achieved by sensing the output voltage and the current flowing through the current sense resistor. duty cycle control is achieved by comparing the integrated voltage signal of the error amplifier and the voltage across r sense . the duty cycle control timing is shown in figure 3. + C C + lamp network inverter lamp lamp ra sw2 l sw1 r sense rb v out emi filter 18 3 pifb pifbo c ramp c1 c2 r1 c ramp pfc out pvfb/ovp 1 Ca s vref1 osc pifbo ramp clk pfc out clk rq v to i peao 13 peao 2 4 start high q low q operation preheat f 3 f 2 f 1 ML4835 set time values for preheat, start and operation, and restart figure 2. three frequency design model
ML4835 8 rev. 1.0 10/12/2000 setting minimum input voltage for output regulation can be achieved by selecting c ramp as follows for peak current mode: c peao k dts t p v vv l dts r ramp max out in out in sense =-- - - f h g i k j - l n m m o q p p 22 1 1 22 2 18 () () d kp (1) and for average current mode: c peao k dts t p v v l dts r ramp max out in out sense =-- - f h g i k j - l n m m o q p p 22 1 1 2 2 18 () () d kp (1a) where d t is the dead time. overvoltage protection and inhibit the ovp pin serves to protect the power circuit from being subjected to excessive voltages if the load should change suddenly (lamp removal). a divider from the high voltage dc bus sets the ovp trip level. when the voltage on pvfb/ovp exceeds 2.75v, the pfc transistor are inhibited. the ballast section will continue to operate. transconductance amplifiers the pfc voltage feedback amplifier is implemented as an operational transconductance amplifier. it is designed to have low small signal forward transconductance such that a large value of load resistor (r1) and a low value ceramic capacitor (<1f) can be used for ac coupling functional description (continued) figure 5. compensation network figure 6. output configuration figure 7. transconductance amplifier characteristics C + 1 2.5v pvfb/ovp r1 c1 c2 current mirror in out current mirror in out gmv in io = gmv in iq + 2 gmv in iq C 2 v in differential linear slope region 0 i o figure 4. simplified model of ML4835 eol functionality ML4835 power level trip point power detect power shutoff
ML4835 rev. 1.0 10/12/2000 9 clock c t v th = 3.75v v tl = 1.25v t dis t chg interrupt r x /c x 10 11 3.75/1.25v + C 1.25/1.0v 0.625 r set v cc r t2 ref lea_enb c t 9 r t2 r t C + 8 20 + r t /c t 5.5ma i chg during preheat after preheat lea_enb = hi lea_enb = low i rset chg = 2.5v i rset chg = 5v 8k25% C 7.5v i rset chg = 5v 8k25% C leao note 1: r set should be selected such that after preheat with lea_enb "hi", i chg must be < 0. i chg is a uni-directional source current only. 19 4.75/1.25v C + 7.5v figure 8. oscillator block diagram and timing figure 9. typical v cc and i cc waveforms when the ML4835 is started with a bleed resistor from the rectified ac line and bootstrapped from an auxiliary winding. v cc z v(on) v(off) 5.5ma 0.34ma v cc i cc t t
ML4835 10 rev. 1.0 10/12/2000 (c1) in the frequency compensation network. the compensation network shown in figure 5 will introduce a zero and a pole at: f rc f rc zp == 1 2 1 2 11 12 pp (2) figure 4 shows the output configuration for the operational transconductance amplifiers. a dc path to ground or v cc at the output of the transconductance amplifiers will introduce an offset error. the magnitude of the offset voltage that will appear at the input is given by v os = io/gm. for an io of 1a and a gm of 0.05 w the input referred offset will be 20mv. capacitor c1 as shown in figure 5 is used to block the dc current to minimize the adverse effect of offsets. slew rate enhancement is incorporated into all of the operational transconductance amplifiers in the ML4835. this improves the recovery of the circuit in response to power up and transient conditions. the response to large signals will be somewhat non-linear as the transconductance amplifiers change from their low to high transconductance mode, as illustrated in figure 7. end of lamp life at the end of a lamps life when the emissive material is depleted, the arc current is rectified and high voltage occurs across the lamp near the depleted cathode. the ballast acts as a constant current source so power is dissipated near the depleted cathode which can lead to arcing and bulb cracking. compact fluorescent lamps are more prone to cracking or shattering because their small diameter cant dissipate as much heat as the larger linear lamps. compact fluorescents also present more of a safety hazard since they are usually used in downlighting systems without reflector covers. eol and the ML4835 the ML4835 uses a circuit that creates a dc voltage representative of the power supplied to the lamps through the inverter. this voltage is used by the ML4835 to latch off the ballast when it exceeds an internal threshold. an external resistor can be used as the eol latch resistor to set the power level trip point, as shown in by r9 in figure 12. see micro linear ML4835 user guide and applications notes for more details. figure 4 illustrates a simplified model of ML4835 eol functionality. ballast output section the ic controls output power to the lamps via frequency modulation with non-overlapping conduction. this means that both ballast output drivers will be low during the discharging time t dis of the oscillator capacitor c t . oscillator the vco frequency ranges are controlled by the output of the lfb amplifier (r set ). as lamp current decreases, lfb out falls in voltage, causing the c t charging current to increase, thereby causing the oscillator frequency to increase. since the ballast output network attenuates high frequencies, the power to the lamp will be decreased. the oscillator frequency is determined by the following equations: f tt osc chg dis = + 1 (3) and trcin vi rv vii rv chg t t ref chg t tl ref chg t th = +- +- f h g i k j (4) the oscillators minimum frequency is set when i chg = 0 where: f rc min tt @ 1 051 . (5) the oscillator's start frequency can be expressed by: f rr c start tt t = 1 051 2 . ch (5a) both equations assume that t chg >> t dis . when lfb out is high, i chg = 0 and the minimum frequency occurs. the charging current varies according to two control inputs to the oscillator: 1. the output of the preheat timer 2. the voltage at lfb out (lamp feedback amplifier output) in preheat condition, charging current is fixed at i r chg preheat set () . = 25 (6) in running mode, charging current decreases as the voltage rises from 0v to v oh at the lamp fb amplifier. the charging current behavior can be expressed as: i v r leao k chg set =- 5 8 25% (7) the highest frequency is attained when i chg is highest, which is attained when voltage at lfb out is at 0v: i r chg set () 0 5 = (8) functional description (continued)
ML4835 rev. 1.0 10/12/2000 11 highest lamp power, and lowest output frequency are attained when voltage at lfb out is at its maximum output voltage (v oh ). in this condition, the minimum operating frequency of the ballast is set per equation 5 above. for the ic to be used effectively in dimming ballasts with higher q output networks a larger c t value and lower r t value can be used, to yield a smaller frequency excursion over the control range (voltage at lfb out). the discharge current is set to 5.5ma. assuming that i dis >>i rt : tc dis vco t () @ 600 (9) ic bias, under-voltage lockout and thermal shutdown the ic includes a shunt clamp which will limit the voltage at v cc to 15v (v ccz ). the ic should be fed with a current limited source, typically derived from the ballast transformer auxiliary winding. when v cc is below v ccz C 1.1v, the ic draws less than 0.55ma of quiescent current and the outputs are off. this allows the ic to start using a bleed resistor from the rectified ac line. to help reduce ballast cost, the ML4835 includes a temperature sensor which will inhibit ballast operation if the ics junction temperature exceeds 130c. in order to use this sensor in lieu of an external sensor, care should be taken when placing the ic to ensure that it is sensing temperature at the physically appropriate point in the ballast. the ML4835s die temperature can be estimated with the following equation: tt p cw ja d @+ + (/) 65 (10) starting, re-start, preheat and interrupt the lamp starting scenario implemented in the ML4835 is designed to maximize lamp life and minimize ballast heating during lamp out conditions. the circuit in figure 10 controls the lamp starting scenarios: filament preheat and lamp out interrupt. c x is charged with a current of i r(set) /4 and discharged through r x . the voltage at c x is initialized to 0.7v (v be ) at power up. the time for c x to rise to 4.75v is the filament preheat time. during that time, the oscillator charging current (i chg ) is 2.5/r set . this will produce a high frequency for filament preheat, but will not produce sufficient voltage to ignite the lamp or cause significant glow current. after cathode heating, the inverter frequency drops to f start causing a high voltage to appear to ignite the lamp. if lamp current is not detected when the lamp is supposed to have ignited, the c x charging current is shut off and the inverter is inhibited until c x is discharged by r x to the 1.25v threshold. shutting off the inverter in this manner prevents the inverter from generating excessive heat when the lamp fails to strike or is out of socket. typically this time is set to be fairly long by choosing a large value of r x . lfb out is ignored by the oscillator until interrupt is above 1.25v the c x pin is clamped to about 7.5v. care should also be taken not to turn on the vccz clamp so as not to dissipate excessive power in the ic. this will cause the temp sensor to become active at a lower ambient temperature. a summary of the operating frequencies in the various operating modes is shown below. operating mode operating frequency [f(max) to f(min)] preheat 2 after preheat f(start) dimming control f(min) to f(max) figure 10. lamp preheat and interrupt timers functional description (continued) r x c x heat inhibit 0.625 r set lea_enb or dimming lockout interrupt 10 r x /c x s r q 1.25/4.75 + C 1.0/1.25 + C 1.25/6.75 + C 9
ML4835 12 rev. 1.0 10/12/2000 figure11. lamp starting and restart timing 6.75 7.5 4.75 1.25 .7 0 r x /c x heat lea_enb or dimming lockout interrupt inhibit typical applications the ML4835 can be used for a variety of lamp types: t4 or compact fluorescent lamps iec t8 (linear lamps) t5 linear lamps t12 linear lamps the ML4835 can also be used for dimming applications. for example, 20:1 dimming can be achieved using the ML4835 with external dimming units. the applications schematics shown in figures 12, 13, and 14 are examples of the various uses of the ML4835.
ML4835 rev. 1.0 10/12/2000 13 figure12. ballast for architectural dimming applications u1 f1 l1 l2 c1 3.3nf c2 3.3nf c6 0.1f c3 0.15f d1 d2 d3 d5 1a, 50v d6 1a, 50v d4 d9, 0.1a 75v d18 0.1a 75v d14 0.1a 75v d11, 15v, 0.5w d13 5.6v, 0.5w 120v rms r4, 62k w d10, 0.1a 75v d7 1a, 600v (ultra- fast) d8, 1a, 600v r25 100 w r7 432k w r6 432k w t1 610 8 9 q1 4.5a, 500v r8 5.76k w r9 4.3 w r24 20k w c8 47f hot neutral r y b r y b c30 120pf c28 120pf c14 0.015f d19 1a 600v d15 1a 600v d12 0.1a, 75v c12 0.33f 4 3 2 1 8 9 51 610 t3 d16, 0.1a, 75v r11 150 w r10 30 w c9 1f q2 2.5a, 500v 6 7 d17, 0.1a, 75v r12 150 w 1 8 q3 2.5a, 500v t3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 r13 1k w c15 1f r14 22.6k w pvfb peao pifb pifbo lfb leao rset rt2 rt/ct intrpt ref v cc pfc out out a out b p gnd a gnd ramp pw det rx/cx ML4835 c29 100pf c17 8.2nf c16 82nf c4 33nf c18 1.5nf r15, 681k w r17 4.3k w r22 360k w r18 8.06k w r26 5k w c19 1f c20 1.5nf c22 1.5f c24 470pf c25 0.22f c27 0.22f c1 100f c21 15f r23, 200k w r16 10k w c23 6.8f c26 47f + C + C violet grey manual dimmer 0-10vdc t1 d2 18v c4 10f r7 3.32k w r6 3.32k w q1 d3 c2 220pf r5 1m w c3, 1nf r3 16.2k w r4 220k w u2a u2b r2 1.5k w u1 r1 604 w c5 0.01f r8 180 w d1 0.1a, 75v 3 4 1 2 3 4 5 6 7 8 1 2 5 4 dimmer interface assembly d1-d4: 1a, 600v r1 0.33 w r2 100 w r3 820 w r19, 16.2k w r21, 51.1k w c5 0.1f c7 100f 3 2 7 6 c11 6800pf
ML4835 14 rev. 1.0 10/12/2000 figure13. ballast for architectural downlighting applications u1 f1 l1 l2 c1 3.3nf c2 3.3nf c6 0.1f c3 0.15f d1 d2 d3 d5 1a, 50v d6 1a, 50v d4 d9, 0.1a 75v d18 0.1a 75v d14 0.1a 75v d11, 15v, 0.5w d13 5.6v, 0.5w 120v rms r4, 62k w d10, 0.1a 75v d7 1a, 600v (ultra- fast) d8, 1a, 600v r25 100 w r7 432k w r6 432k w t1 610 8 9 q1 4.5a, 500v r8 5.76k w c8 47f hot neutral r y b r y b c30 120pf c28 120pf c10 0.33f c11 6800pf c14 0.015f d19 1a 600v d15 1a 600v d12 0.1a, 75v c13 2700pf c12 0.33f 4 3 2 1 8 9 51 610 7 6 10 t3 8 6 d16, 0.1a, 75v r11 150 w r10 30 w c9 1f q2 2.5a, 500v 3 2 6 7 d17, 0.1a, 75v r12 150 w 1 8 q3 2.5a, 500v t3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 r13 1k w c15 1f r14 22.6k w pvfb peao pifb pifbo lfb leao rset rt2 rt/ct intrpt ref v cc pfc out out a out b p gnd a gnd ramp pw det rx/cx ML4835 c29 100pf c17 8.2nf c16 82nf c4 33nf c18 1.5nf r15, 681k w r17 4.3k w r22 360k w r18 8.06k w r26 5k w c19 1f c20 1.5nf c22 1.5f c24 470pf c25 0.22f c27 0.22f c1 100f c21 15f r23, 200k w r16 10k w c23 6.8f c26 47f + C + C violet grey manual dimmer 0-10vdc t1 d2 18v c4 10f r7 3.32k w r6 3.32k w q1 d3 c2 220pf r5 1m w c3, 1nf r3 16.2k w r4 220k w u2a u2b r2 1.5k w u1 r1 604 w c5 0.01f r8 180 w d1 0.1a, 75v 3 4 1 2 3 4 5 6 7 8 1 2 5 4 dimmer interface assembly d1-d4: 1a, 600v r1 0.33 w r2 100 w r3 820 w c5 0.1f c7 100f r19, 16.2k w r21, 51.1k w r9 4.3 w r24 20k w l3
ML4835 rev. 1.0 10/12/2000 15 figure14. non-dimming ballast for downlighting applications u1 f1 l1 l2 c1 3.3nf c2 3.3nf c6 0.1f c3 0.15f d1 d2 d3 d5 1a, 50v d6 1a, 50v d4 d9, 0.1a 75v d18 0.1a 75v d14 0.1a 75v d11, 15v, 0.5w 120v rms r4, 62k w d10, 0.1a 75v d7 1a, 600v d8, 1a, 600v r25 100 w r7 432k w r6 432k w t1 610 8 9 q1 4.5a, 500v r8 5.76k w c8 47f hot neutral r y b r y b c30 120pf c28 120pf c14 0.015f d19 1a 600v d15 1a 600v d12 0.1a, 75v c12 0.33f 4 3 2 1 8 9 51 610 t3 d16, 0.1a, 75v r11 150 w r10 30 w c9 1f q2 2.5a, 500v 6 7 d17, 0.1a, 75v r12 150 w 1 8 q3 2.5a, 500v 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 pvfb peao pifb pifbo lfb leao rset rt2 rt/ct intrpt ref v cc pfc out out a out b p gnd a gnd ramp pw det rx/cx ML4835 c29 100pf c17 8.2nf c16 82nf c4 33nf c18 1.5nf r15, 681k w r22 360k w r18 8.06k w r26 5k w c20 1.5nf c22 1.5f c24 470pf c25 0.22f c27 0.22f c21 15f r23, 200k w c23 6.8f c26 47f d1-d4: 1a, 600v r1 0.33 w r2 100 w r3 820 w c5 0.1f c7 100f 3 2 7 6 c11 6800pf r13 1k w r19, 16.2k w r21, 51.1k w r9 4.3 w r24 20k w t3
ML4835 16 rev. 1.0 10/12/2000 physical dimensions inches (millimeters) seating plane 0.291 - 0.301 (7.39 - 7.65) pin 1 id 0.398 - 0.412 (10.11 - 10.47) 0.498 - 0.512 (12.65 - 13.00) 0.012 - 0.020 (0.30 - 0.51) 0.050 bsc (1.27 bsc) 0.022 - 0.042 (0.56 - 1.07) 0.095 - 0.107 (2.41 - 2.72) 0.005 - 0.013 (0.13 - 0.33) 0.090 - 0.094 (2.28 - 2.39) 20 0.007 - 0.015 (0.18 - 0.38) 0o - 8o 1 0.024 - 0.034 (0.61 - 0.86) (4 places) package: s20 20-pin soic seating plane 0.240 - 0.260 (6.09 - 6.61) pin 1 id 0.295 - 0.325 (7.49 - 8.26) 1.010 - 1.035 (25.65 - 26.29) 0.016 - 0.022 (0.40 - 0.56) 0.100 bsc (2.54 bsc) 0.008 - 0.012 (0.20 - 0.31) 0.015 min (0.38 min) 20 0o - 15o 1 0.055 - 0.065 (1.40 - 1.65) 0.170 max (4.32 max) 0.125 min (3.18 min) 0.060 min (1.52 min) (4 places) package: p20 20-pin pdip
ML4835 rev. 1.0 10/12/2000 17 ordering information part number temperature range package ML4835cp (end of life) 0c to 70c 20-pin dip (p20) ML4835cs (end of life) 0c to 70c 20-pin soic (s20) life support policy fairchild? products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com ?2000 fairchild semiconductor corporation disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others.

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