lab seme ip5661 c ip5561c semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 4/95 switchedCmode power supply control circuit features ? stabilised power supply ? temperature compensated reference source ? sawtooth generator ? pulse width modulator ? current limiting ? 8 pin dip supply voltage sourced current sourced output transistor output current collector voltage (pin 7) t j operating junction temperature t stg storage temperature range 18v 30ma 40ma 18v see ordering information C55 to +150c absolute maximum ratings (t case = 25c unless otherwise stated) top view j package C 8 pin ceramic dip n package C 8 pin plastic dip d package C 8 pin plastic (150) soic 1 2 3 4 8 7 6 5 output feedback gain gnd current sense v z v cc r t /c t part jCpack nCpack dC8 temp. number 8 pin 8 pin 8 pin range ip5561 4 -55 to +125c ip5561c 444 0 to +70c order information note: to order, add the package identifier to the part number. eg. ip5561j ip5561cdC8 gain 5 sawtooth generator latch s r 0.5v current sense 6 stabilised supply 18 gnd 2 4 3 cc v z v feedback error amp pwm t c t r reference voltage cc v output 7 8.2v block diagram description the ip5561 is a control circuit for use in switched mode power supplies. this single monolithic chip incorporates all the control and supervisory (protection) functions required in switched mode power supplies, including an internal temperature compensated reference source, internal zener reference, sawtooth generator, pulse width modulator, output stage and cycle by cycle current limit.
internal reference voltage (v ref ) temperature coefficient of v ref internal reference (v z ) temperature coefficient of v z frequency range initial accuracy oscillator duty cycle range i in single pulse inhibit delay current limit trip level output voltage swing (v oh ) output voltage swing (v ol ) open loop gain feedback resistor small signal bandwidth v ce(sat) output current supply current (i cc ) supply voltage (v cc ) pin 1 threshold t j = over temp. range i l = -7ma t j = over temp. range f o = 20khz v pin6 = 250mv t j = over temp. range inhibit delay time i out = 20ma for 20% overdrive i out = 40ma i c = 20ma t j = over temp. range t j = over temp. range i z = 0, voltage fed t j = over temp. range i cc = 10ma, voltage fed i cc = 30ma, voltage fed 3.69 3.75 3.84 3.65 3.88 100 7.8 8.2 8.8 200 50 100k 12 0C90 0C98 C2 C10 -20 0.88 1.10 0.7 0.8 0.40 0.50 0.60 6.2 0.7 60 10k 3 0.4 20 10 13 20 21 22 20 30 8 9 10.5 lab seme ip5661 c ip5561c semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 4/95 v ppm/c v ppm/c hz % m a m s v v db w mhz v ma ma v v 3.57 3.75 3.96 3.55 3.98 100 7.8 8.2 8.8 200 50 100k 12 0C90 0C98 C2 C10 -20 0.88 1.10 0.7 0.8 0.40 0.50 0.60 6.2 0.7 60 10k 3 0.4 20 10 13 19 21 24 20 30 8 9 10.5 ip5561 ip5561c parameter test conditions min. typ. max. min. typ. max. units electrical characteristics (t j = 25c unless otherwise stated) current limiting error amplifier reference sections oscillator section output stage supply voltage/current notes 1) test conditions: v cc = 12v , t j = 25c unless otherwise stated 2) tests marked t j = over temp. range apply over the full temperature range ie. t j = -55 to +125c for ip5561 t j = 0 to +70c for ip5561c low supply protection
lab seme ip5661 c ip5561c semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 4/95 frequency (hz) -180 -150 -120 -90 -60 -30 0 1k 10k 100k 1m 10m phase angle (?) frequency (hz) 1k 10k 100k 1m 10m 0 10 20 30 40 50 60 gain (db) typical performance characteristics error amplifier open loop phase open loop gain d C duty cycle (%) 0123456 0 10 20 30 40 50 60 70 80 90 100 v pin 4 d C maximum duty cycle (%) max 012345 0 10 20 30 40 50 60 70 80 90 100 v pin 1 transfer curve of pulse width modulator duty cycle vs input voltage maximum duty cycle vs base voltage on q1
r 2 d max = f v z + v be q1 r 1 +r 2 () lab seme ip5661 c ip5561c semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 4/95 typical performance characteristics error amplifier power derating curve slow start voltage typical frequency plot vs r t and c t start-up circuit (optional) t ambient temperature (?c) a p max (w) d 25 50 75 100 125 150 0.00 0.25 0.50 0.75 1.00 t = r'c pin4 v t oscillator frequency (khz) 1 10 100 200 timing capacitance (nf) 2 2.5 3 3.5 4 4.5 r = 5 k w r = 1 0 k w r = 2 0 k w r = 4 0 k w 5 1.5 50 5 p d =v cc i cc + ( v cc C v z ) i z + ( v pin7 i pin7 x d ) 2 r 1 r c 1 q z v 4 2 ip5561 1 v 5 2 t c t r ip5561
|
