?2002 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.1 features ? low start current 0.2ma (typ) ? operating range up to 500khz ? cycle by cycle current limiting ? under voltage lock out with hysteresis ? short shutdown delay time: typ.100ns ? high current totem-pole output ? output swing limiting: 22v description the ka3882c/ka3883c is a fixed pwm controller for off line and dc to dc converter applications. the internal circuits include an uvlo, a low start up current circuit, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and the high current totem-pole output for driving a power mosfet. also the ka3882c/ka3883c provides low start-up current below 0.3ma and short shutdown delay time typ. 100ns. the ka3882c has the uvlo threshold of 16v (on) and 10v(off). the ka3883c is 8.4v(on) and 7.6v(off). the ka3882c and ka3883c can operate within 100% duty cycle. 8-dip 8-sop 1 1 internal block diagram 8 + - 7 5 set/ reset 5v v ref internal bias good logic 2 r s oscillator 1 3 4 t 7 6 5 uvlo 29v 22v 1/3 error amp 1/2v ref 1v c.s comp. pwm latch v ref v fb comp c.s r t /c t output v cc gnd pwr v c pwr gnd ka3882c/ka3883c smps controller
ka3882c/ka3883c 2 absolute maximum ratings electrical characteristics (v cc = 15v, r t = 10k ? , c t = 3.3nf, t a = 0 c to +70 c ,unless otherwise specified) parameter symbol value unit supply voltage v cc 30 v output current i o 1 a analog inputs (pin 2, 3) v i(ana) -0.3 to 6.3 v error amp. output sink current i sink(ea) 10 ma power dissipation p d 1w thermal resistance, junction-to-air (note4) 8-sop 8-dip r ja 280 95 c/w storage temperature t stg -65 ~ 150 c parameter symbol conditions min. typ. max. unit reference section output voltage v ref t j = 25 c, i o = 1ma 4.9 5.0 5.1 v line regulation ? v ref v cc = 12v to 25v - 6 20 mv load regulation ? v ref i o = 1ma to 20ma - 6 25 mv output short circuit i sc t a = 25 c - -100 -180 ma osillator section initial accuracy f osc t j = 25 c475257khz voltage stability st v v cc = 12v to 25v - 0.2 1 % amplitude v osc v pin4 , peak to peak - 1.7 - v discharge current i dischg t j = 25 c, pin4 = 2v 7.8 8.3 8.8 ma current sense section gain g v (note2, 3) 2.85 3 3.15 v/v maximum input signal v i(max) v pin1 = 5v(note2) 0.9 1.0 1.1 v psrr psrr v cc = 12v to 25v (note1, 2) - 70 - db input bias current i bias - - -2 -10 ua delay to output t d v pin3 = 0 v to 2v (note1) - 100 200 ns
ka3882c/ka3883c 3 electrical characteristics (continued) (v cc = 15v, r t = 10k ? , c t = 3.3nf, t a = 0 c to +70 c, unless otherwise specified) * adjust v cc above the start threshold before setting at 15v notes : 1. these parameters, although guaranteed, are not 100% tested in production. 2. parameter measured at trip point of latch with v2 = 0v. 3. gain defined as: g v = ? v pin1 ? v pin3 (v pin3 = 0 to 0.8v) 4. junction-to-air thermal resistance test enviroments. -. pcb information ; board thickness : 1.6mm , board dimension : 76.2 x 114.3mm 2 , ref. : eia / jsed51-3 and eia / jsed51-7 -. board structure; using the single layer pcb. parameter symbol conditions min. typ. max. unit error amplifier section input voltage v i t pin1 = 2.5v 2.42 2.50 2.58 v input bias current i bias - - -0.3 -2 ua open loop gain g vo v o = 2v to 4v (note1) 65 90 - db unity gain bandwidth gbw t j = 25 c (note1) 0.7 1 - mhz psrr psrr v cc = 12v to 25v (note1) 60 70 - db output sink current i sink v pin2 = 2.7v, v pin1 = 1.1v 2 6 - ma output source current i source v pin2 = 2.3v, v pin1 = 5.0v -0.5 -0.8 - ma output high voltage v oh v pin2 = 2.3v, r1 = 15k ? to gnd 5 6 - v output low voltage v ol v pin2 = 2.7v, r1 = 15k ? to pin8 - 0.8 1.1 v output section output low level v ol i sink = 20ma - 0.1 0.4 v i sink = 200ma - 1.5 2.2 v output high level v oh i source = 20ma 13 13.5 - v i source = 200ma 12 13.5 - v rise time t r t j = 25 c, c1 = 1nf (note1) - 40 100 ns fall time t f t j = 25 c, c1 = 1nf (note1) - 40 100 ns output voltage swing limit v olim v cc = 27v, c1 = 1nf - 22 - v under voltage lockout section start threshold v th ka3882c 15 16 17 v ka3883c 7.8 8.4 9.0 v min. operating voltage ( after turn on ) v tl ka3882c 9 10 11 v ka3883c 7.0 7.6 8.2 v pwm section maximum duty cycle d max ka3882c/ka3883c 94 96 100 % minimum duty cycle d min - --0% total standby current start-up current i st - -0.20.4ma operating supply current i cc v pin2 = v pin3 = 0v - 11 17 ma v cc zener voltage v z i cc = 25ma - 29 - v
ka3882c/ka3883c 4 mechanical dimensions package 6.40 0.20 3.30 0.30 0.130 0.012 3.40 0.20 0.134 0.008 #1 #4 #5 #8 0.252 0.008 9.20 0.20 0.79 2.54 0.100 0.031 () 0.46 0.10 0.018 0.004 0.060 0.004 1.524 0.10 0.362 0.008 9.60 0.378 max 5.08 0.200 0.33 0.013 7.62 0~15 0.300 max min 0.25 +0.10 ?.05 0.010 +0.004 ?.002 8-dip
ka3882c/ka3883c 5 mechanical dimensions (continued) package 4.92 0.20 0.194 0.008 0.41 0.10 0.016 0.004 1.27 0.050 5.72 0.225 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 6.00 0.30 0.236 0.012 3.95 0.20 0.156 0.008 0.50 0.20 0.020 0.008 5.13 0.202 max #1 #4 #5 0~8 #8 0.56 0.022 () 1.80 0.071 max0.10 max0.004 max min + 0.10 -0.05 0.15 + 0.004 -0.002 0.006 8-sop
ka3882c/ka3883c 9/10/02 0.0m 001 stock#dsxxxxxxxx ? 2002 fairchild semiconductor corporation life support policy fairchild?s 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 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. ordering information product number package operating temperature ka3882c 8-dip 0 ~ +70 c ka3882cd 8-sop ka3883c 8-dip ka3883cd 8-sop
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