lab seme ip1525a series IP1527A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 3/95 regulating pulse width modulators features ? 8 to 35v operation ? 5.1v reference trimmed to 1% ? 100hz to 500khz oscillator range ? separate oscillator sync terminal ? adjustable deadtime control ? internal soft start ? input undervoltage lockout ? latching pwm to prevent multiple pulses ? dual source/sink output drivers +v in input voltage collector voltage logic inputs analogue inputs output current, source or sink reference output load current oscillator charging current p d power dissipation t a = 25c derate @ t a > 50c p d power dissipation t c = 25c derate @ t c > 25c t j operating junction temperature t stg storage temperature range t l lead temperature (soldering, 10 seconds) +40v +40v C0.3 to +5.5v C0.3 to +v in 500ma internally limited 5ma 1w 10mw/c 2w 16mw/c see ordering information C65 to +150c +300c absolute maximum ratings (t case = 25c unless otherwise stated) top view j package C 16 pin ceramic dip n package C 16 pin plastic dip d package C 16 pin plastic (300) soic 8 1 2 3 4 5 6 7 14 13 12 11 10 9 15 16 inv. input n. i. input osc. output soft start discharge sync v ref v in output b ground shutdown compensation c v output a c t r t part jCpack nCpack dC16 temp. number 16 pin 16 pin 16 pin range ip1525a 4 -55 to +125c IP1527A 4 -55 to +125c ip3525a 444 0 to +70c ip3527a 444 0 to +70c order information note: to order, add the package identifier to the part number. eg. ip1525aj ip3527adC16
lab seme ip1525a series IP1527A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 3/95 q q pwm inv. input n.i. input 1 2 error amp t t oscillator r c osc. output 6 5 to internal circuitry v ref 16 15 12 reference regulator gnd +v in 3 sync 4 discharge +v in compensation soft start 8 v ref 50 m a shutdown 10 5k w u.v. lockout flip flop s r latch output a v c 11 14 13 output b 5k w 9 7 ip1525a output stage output a v c 11 14 13 output b IP1527A output stage +8 to +35v +4.5 to +35v 0 to 100ma 0 to 400ma 0 to 20ma 100hz to 400khz 2k w to 200k w 470pf to 0.1 m f 0 to 500 w C55 to +125c 0 to +70c recommended operating conditions block diagram v in input voltage collector voltage sink/source load current (steady state) sink/source load current (peak) reference load current oscillator frequency range r t oscillator timing resistor c t oscillator timing capacitor deadtime resistor range operating ambient temperature range ip1525a / IP1527A ip3525a / ip3527a description the ip1525a and IP1527A families of pwm switching regulator control circuits offer improved performance and lower parts count when used in designing switching power supplies. included are 5.1 volt reference, error amplifier, adjustable dead-time oscillator with synchronisation capability, latched pwm comparator, totem-pole output drivers, shutdown, soft start, and undervoltage lockout. the ip1525a and IP1527A differ only in output phasing. the ip1525a output is low when off, while the IP1527A output is high when off.
output voltage line regulation load regulation temperature stability total output variation short circuit current output noise voltage long term stability initial accuracy voltage stability temperature stability minimum frequency maximum frequency current mirror clock amplitude clock width sync threshold sync input current input offset voltage input bias current input offset current dc open loop gain gain bandwidth product t j = 25c v in = 8 to 35v i l = 0 to 20ma over line, load and temp. v ref = 0 f = 10 hz to 10khz v in = 8 to 35v r t = 200k w c t = 0.1 m f r t = 2k w c t = 470pf i rt = 2ma t j = 25c sync voltage = 3.5v r l 3 10m w t j = 25c lab seme ip1525a series IP1527A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 3/95 ip1525a ip3525a IP1527A ip3527a parameter test conditions min. typ. max. min. typ. max. units electrical characteristics (t j = over operating temperature range unless otherwise stated) 5.0 5.1 5.2 220 550 20 50 4.95 5.25 80 100 40 200 150 26 12 36 90 120 400 600 1.7 2.0 2.2 3.0 3.5 0.3 0.5 1.0 1.2 2.0 2.8 1.0 2.5 210 110 1 60 75 12 5.05 5.10 5.15 210 550 20 50 5.0 5.2 80 100 40 200 110 26 0.3 1 36 90 120 400 600 1.7 2.0 2.2 3.0 3.5 0.3 0.5 1.0 1.2 2.0 2.8 1.0 2.5 0.5 5 110 1 60 75 12 v mv mv v ma m vrms mv khr % hz khz ma v m s v ma mv m a db mhz reference section oscillator section 2 error amplifier section 3 notes 1. test conditions unless otherwise stated: v in = 20v t j = C55 to +125c for ip1525a / IP1527A t j = 0 to +70c for ip3525a / ip3527a 2. oscillator section test conditions: f osc = 40khz (r t = 3.6k w , c t = 0.01 m f , r d = 0) 3. error amplifier section test condition: v cm = 5.1v 4. output driver section test condition: v c = 20v
v cm = 1.5 to 5.2v v in = 8 to 35v v pin1 C v pin2 3 150mv v pin2 C v pin1 3 150mv zero duty cycle max. duty cycle v shutdown = 0v v shutdown = 2v to outputs v shutdown = 2.5v v shutdown = 2.5v t j = 25c i sink = 20ma i sink = 100ma i source = 20ma i source = 100ma v comp = high v c = 35v c l = 1nf t j = 25c c l = 1nf t j = 25c v in = 35v output low level output high level common mode rejection supply voltage rejection minimum duty cycle maximum duty cycle input threshold input threshold input bias current soft start current soft start low level shutdown threshold shutdown input current shutdown delay output low level output high level undervoltage lockout output leakage rise time fall time supply current ip1525a ip3525a IP1527A ip3527a parameter test conditions min. typ. max. min. typ. max. units 0.2 0.5 3.8 5.6 60 75 50 60 0 45 49 0.6 0.9 3.3 3.6 0.05 1.0 25 50 80 0.4 0.6 0.6 1.3 2.0 0.1 1.0 0.2 0.5 0.2 0.4 1.0 2.0 18 19 17 18 578 200 100 600 50 300 10 20 0.2 0.5 3.8 5.6 60 75 50 60 0 45 49 0.6 0.9 3.3 3.6 0.05 1.0 25 50 80 0.4 0.6 0.6 1.3 2.0 0.1 1.0 0.2 0.5 0.2 0.4 1.0 2.0 18 19 17 18 578 200 100 600 50 300 10 20 v db % v m a m a v ma m s v v v m a ns ma lab seme ip1525a series IP1527A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 3/95 notes 1. test conditions unless otherwise stated: v in = 20v t j = C55 to +125c for ip1525a / IP1527A t j = 0 to +70c for ip3525a / ip3527a 2. oscillator section test conditions: f osc = 40khz (r t = 3.6k w , c t = 0.01 m f , r d = 0) 3. error amplifier section test condition: v cm = 5.1v 4. output driver section test condition: v c = 20v electrical characteristics (t j = over operating temperature range unless otherwise stated) pwm comparator error amplifier section (cont.) 3 shutdown section output drivers (each output) 4 total standby current
13 a b ip1525a +v c gnd 12 11 14 +v supply r1 return t1 q1 q2 lab seme ip1525a series IP1527A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 3/95 applications information to output filter 13 r2 a b ip1525a +v c gnd 12 r1 11 14 +v supply return q1 13 a b ip1525a +v c gnd 12 11 14 +v supply r1 return r2 c2 r3 c1 q1 q2 t1 13 a b ip1525a +v c gnd 12 +v supply q1 t1 t2 q2 11 14 r1 r2 return c1 c2 for singleCended supplies, the driver outputs are grounded. the v c terminal is switched to ground by the totemCpole source transistors on alternate oscillator cycle. in conventional pushCpull bipolar designs, forward base drive is controlled by r1Cr3. rapid turnCoff times for the power devices are achieved with speedCup capacitors c1 and c2. low power transformers can be driven directly by the ip1525a. automatic reset occurs during deadtime when both ends of the primary winding are switched to ground. the low source impedance of the output drivers provides rapid charging of power fet input capacitance while minimis- ing external components.
lab seme ip1525a series IP1527A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 3/95 charge time ( m s) 10 100 200 11 ms 10 ms 1 2 5 20 50 10 200 500 100 2 ms 5 ms 2 5 20 50 r timing resistor (k w ) t c = 1 n f t c = 2 n f t c = 5 n f t c = 0 . 0 1 f t c = 0 . 0 2 f t c = 0 . 0 5 f t c = 0 . 1 f t 7 5 r t r d c t 6 discharge time ( m s) 100 200 300 400 500 0 r deadtime resistor ( w ) d c = 1 n f t c = 2 n f t c = 5 n f t c = 0 . 0 1 f t c = 0 . 0 2 f t c = 0 . 0 5 f t c = 0 . 1 f t 0.2 1 10 100 200 0.5 5 22050 typical performance characteristics oscillator charge time vs r t and c t oscillator discharge time vs. r d and c t frequency (hz) c = 1 n f p c = 0 p -20 0 20 40 60 80 100 1 10 100 1k 10k 100k 1m 10m r = 20k w z r = 0 z voltage gain (db) c p r z 9 1 2 1 2 3 4 output current, source or sink (a) 0 0.01 1 0.1 0.2 0.3 0.5 0.7 0.02 0.03 0.05 0.07 saturation voltage (v) v = 20v in t = 25?c a source sat, v - v oh c sink sat, v ol error amplifier openCloop frequency response ip1525a output saturation characteristics
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