?2004 semiconductor components industries, llc. october-2017, rev. 2 public ation order number: ka7553a/d features ? built-in drive circuits for direct connection power mosfet (l o = 1.5a) ? wide operating frequency range (5khz ~ 600khz) ? pulse by pulse over current limiting ? over load protection ? on/off control by external trigger ? internal uvlo ? low standby current (typ. 90ua) ? soft start circuit description the KA7552A/ka7553a are switching power control ic for wide operating frequency range. the internal circuits include pulse by pulse current limiting, protection, on/off control by external trigger, low standby current, soft start, and high current totempole output for driving a power mosfet. maximum duty of the KA7552A is 70% and the ka7553a is 46%. when duty is maximum, the input threshold voltage of pin2 & pin8 are not same in KA7552A and ka7553a. 8-dip 1 internal block diagram 8 7 1 6 5 4 3 2 cs c t r t v cc output gnd is(+) fb 0.56 ~ 0.42v 10ua 7v pwm 2.4v 1.9v o.c.p 0.24v 4.3k off 3.6v 2.8v osc uvlo r s q bias (4v) + _ + - - - _ + + - + - KA7552A/ka7553a smps controller
KA7552A/ka7553a www.onsemi.com 2 absolute maximum ratings electrical characteristics (v cc = 18v, f osc = 135khz, t a = 25 c, unless otherwise specified) parameter symbol value unit supply voltage v cc 30 v output current i o 1.5 a input voltage at overcurrent detection pin v in(is) -0.3 to 4 v input voltage at fb pin v in(fb) 4v input current at cs pin i in(cs) 2m a total power dissipation (ta = 25 c) p d 800 mw operating temperature t opr -25 to 85 c storage temperature range t stg -65 to 150 c junction temperature t j +125 c parameter symbol conditions min. typ. max. unit oscillator section initial accuracy f osc c t = 360pf, t j = 25 c 125 135 145 khz frequency variation 1 ? f/ ? vv cc = 10v to 30v - 1 3% frequency variation 2 (note1) ? f/ ? vt a = 25 c to 85 c- 1.5 - % ramp high voltage v rh c t = 360pf, t j = 25 c 2.80 3.08 3.30 v ramp low voltage v rl c t = 360pf, t j = 25 c 0.6 0.9 1.2 v amplitude v osc v pin7 , peak to peak 1.80 2.18 2.50 v pulse width modulation section input threshold voltage(pin2) v th(fbd) duty cycle = 0% 0.6 0.75 0.95 v input threshold voltage(pin2) (note1) v th(fb1) (ka7552) duty cycle = dmax 1 2.1 2.3 2.6 v v th(fb2) (ka7553) duty cycle = dmax 2 1.6 1.8 2.1 v max. duty cycle d (max1) (ka7552) - 66 70 74 % d (max2) (ka7553) - 43 46 49 % source current(pin2) i source(fb) v pin2 = 0v -660 -800 -960 ua overcurrent limit section input threshold voltage v th(is) - 0.21 0.24 0.27 v source current(pin3) i source(is) v pin3 = 0v -300 -200 -100 ua deley time (note1) t d - - 150 - ns soft start section charging current i chg v pin8 = 0v -15 -10 -5 ua input threshold voltage(pin8) v th(cso) - 0.7 0.9 1.1 v input threshold voltage(pin8) (note1) v th(cs1) (ka7552) duty cycle = dmax 1 2.2 2.4 2.6 v v th(cs2) (ka7553) duty cycle = dmax 2 1.7 1.9 2.1 v latch mode shutdown circuit section sink current(pin8) i sink(cs) v pin8 = 6v, v pin2 = 1v 25 45 65 ua shutdown threshold voltage v th(sd,cs) - 6.7 7.2 7.7 v overload shutdown section shutdown threshold voltage v th(sd,fb) - 2.6 2.8 3.1 v
KA7552A/ka7553a electrical characteristics (continued) (v cc = 18v, f osc = 135khz, t a = 25 c, unless otherwise specified) note : 1. these parameters, although guaranteed, are not 100% tested in production. 2. recommend operating condition : - vcc(min) = 12v -r t = 3.3k ? ~ 10k ? - oscillation frequency = 5khz ~ 600khz - soft start capacitor(c s ) = 0.1uf ~ 1uf parameter symbol conditions min. typ. max. unit under voltage lockout section start-up threshold voltage v th(st) - 15.5 16.0 16.5 v minimum operating voltage v opr(min) - 8.20 8.70 9.20 v hysteresis v hys - 6.40 7.30 8.20 v on/off control section source current(pin8) i source(cs) v pin8 = 0v -15 -10 -5 ua on threshold voltage v th(on) v pin8 : off->on 0.45 0.56 0.70 v off threshold voltage v th(off) v pin8 : on -> off 0.30 0.42 0.55 v output section low output voltage v ol i o = 100ma, v cc = 18v - 1.3 1.8 v high output voltage v oh i o = -100ma, v cc = 18v 16.0 16.5 18.0 v rise time (note1) t r no load - 50 - ns fall time (note1) t f no load - 50 - ns overall stand-by current i sb v cc = 14v - 90 150 ua operating current i cc(opr) v pin2 = 0v - 9 15 ma power supply current off i cc(off) v pin8 = 0v - 1.1 1.8 ma power supply current shutdown i cc(sd) v pin8 = 7.6v - 1.1 1.8 ma www.onsemi.com 3
KA7552A/ka7553a mechanical dimensions package dimensions in millimeters 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 www.onsemi.com 4
KA7552A/ka7553a ordering information product number package operating temperature KA7552A 8-dip -25 ~ +85 c ka7553a www.onsemi.com 5
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