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ha17451ap/afp switching regulator controllers for dc/dc converters ade-204-057 (z) rev. 0 dec. 2000 description the ha17451 is a dual-channel switching regulator controller ic. each channel contains the basic circuits for controlling a pwm-type switching-regulator power supply. both channels are integrated onto the same chip. both channels can be completely synchronized, using the same oscillator output waveform. each channel can provide output voltages for step-up, step-down, inverting, and other converter topologies. these controllers operate at voltages from 3.3 v to 40 v, making them suitable for a wide range of applications. they are ideal for chopper-type dc/dc converters. they are similar to the tl1451, but note that the ha17451a differs from the tl1451a. functions low-dropout 2.5v voltage reference undervoltage lockout triangle-wave oscillator adjustable dead-time control error amplifier output driver (open-collector transistor type) pwm comparator
ha17451ap/afp 2 features low dropout voltage of on-chip 2.5v voltage reference: vdrop = 0.2 v (typ) operates throughout wide supply voltagerange: 3.3 v to 40 v large maximum output current: 50 ma (max) undervoltage lockout circuit high threshold voltage: 3.15 v (typ) low threshold voltage: 2.98 v (typ) low current drain: 1.5 ma (typ) operates at wide range of oscillator frequencies: f osc = 1 khz to 300 khz dead time adjustable through full duty cycle range surface-mount package (sop16) for saving space (ha17451afp) ordering information type name package ha17451ap dp-16 ha17451afp fp-16da
ha17451ap/afp 3 pin arrangement 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 c t r t non. inv. input1 inv. input1 feed back1 d.t.c1 out1 gnd vref non. inv. input2 inv. input2 feed back2 d.t.c2 out2 v cc s.c.p (top view) pin functions pin no. symbols functions 1c t timing capacitor 2r t timing resistor 3, 14 non. inv. input non-inverting input of error amp 4, 13 inv. input inverting input of error amp 5, 12 feedback output of error amp 6, 11 d.t.c dead time control 7, 10 out output 8 gnd ground 9v cc input voltage 15 s.c.p short circuit protection 16 vref reference voltage output
ha17451ap/afp 4 block diagram v cc reference voltage generation circuit triangle oscillator out1 output1 out2 output2 dead time control2 dead time control1 gnd r under- voltage lockout vref /2 error amp2 short circuit protection comparator pwm comparator2 pwm comparator1 + + + + vref non. inv. input1 inv. input1 feedback1 feedback2 non. inv. input2 inv. input2 s.c.p (16) (3) (4) c r tt (6) vref (5) (12) (14) (15) (11) (8) d.t.c2 d.t.c1 (10) (7) (2) (1) (9) error amp1 + + (13)
ha17451ap/afp 5 short-circuit protection in ha17451a 5 12 15 (2) 14 13 10 (1) (3) + + + + ? high low error amp2 low 1.23 v vref vref pwm comparator2 feedback line load (voltage drop) v b ? vout r u.v.l.o. also used as positive feedback route positive feedback shutdown (1)overcurrent ? (2)vout drops ? (3)output turns off absolute maximum ratings (ta = 25 c) item symbol rating unit note power supply voltage v cc 40 v error amplifier input voltage v i 20 v collector output voltage v o 40 v collector output current i o 50 ma power dissipation p t 680 mw * operating temperature topr - 20 to +85 c storage temperature tstg - 55 to +125 c note: this value applies to the ha17451ap at ambient temperatures up to ta = 45 c. derate by8.3 mw/ c above that point.
ha17451ap/afp 6 electrical characteristics (ta = 25 c, v cc = 6 v, f osc = 200 khz) reference section item symbol min typ max unit test conditions output voltage vref 2.40 2.50 2.60 v i o = 1 ma voltage drop vdrop ? 0.2 0.35 v i o = 1 ma line regulation line ? 2 12.5 mv v cc = 3.0 to 40 v load regulation load ? 1 7.5 mv i o = 0.1 to 1 ma maximum output current i omax 3 10 30 ma vref = 0.5 v reverse voltage state minimum current i or 18 ?? m a - 0.2 v < vref < 0 v undervoltage lockout protection section item symbol min typ max unit test conditions high level threshold vth 2.90 3.15 3.30 v i o = 0.1 ma low level threshold vtl 2.75 2.98 3.15 v i o = 0.1 ma hysteresis width v hys 100 170 ? mv i o = 0.1 ma reset voltage v r 1.5 1.9 ? vi o = 0.1 ma protection section item symbol min typ max unit test conditions input threshold v tpc 0.56 0.61 0.66 v input standby voltage v stby 140 185 230 mv no pull up input source current ibpc 10 15 20 m a comparator threshold voltage vtc ? 1.23 ? v pins 5 and 12 oscillator section item symbol min typ max unit test conditions frequency f osc ? 200 ? khz c t = 330 pf, r t = 10 k w initial accuracy f dev ? 10 ? % voltage stability f dv ? 1 ? %
ha17451ap/afp 7 electrical characteristics (ta = 25 c, v cc = 6 v, f osc = 200 khz) (cont) dead time control section item symbol min typ max unit test conditions input threshold voltage vt0 ? 2.05 2.25 v f osc = 10 khz duty cycle = 0% input threshold voltage vt100 1.20 1.45 ? vf osc = 10 khz duty cycle = 100% error amp section item symbol min typ max unit test conditions input offset voltage v io - 6 ? 6mvv o (pin 5, 12) = 1.25 v input offset current i io - 100 ? 100 na v o (pin 5, 12) = 1.25 v input bias current i b ? 160 500 na v o (pin 5, 12) = 1.25 v common mode input voltage range v icr 1.0 ? 1.45 v v cc = 3.3 to 40 v open loop gain a v 70 80 ? db r nf = 200 k w * band width gb ? 2.5 ? mhz common mode rejection ratio cmrr 40 60 ? db maximum output voltage v om+ vref - 0.15 ?? v v om- ?? 1.0 output sink current i om+ 0.5 1.6 ? ma v o = 1.25 v output source current i om- ?- 70 - 45 m av o = 1.25 v note: r nf is connected between pin 4 and 5 for channel 1, pin 12 and 13 for channel 2. output section item symbol min typ max unit test conditions collector off-state current (1) i leak (1) ?? 10 m av o = 40 v collector off-state current (2) i leak (2) ?? 10 m av o = 40 v v cc = open saturation voltage vsat ? 1.2 2 v i o = 10 ma
ha17451ap/afp 8 pwm comparator section item symbol min typ max unit test conditions input threshold voltage vt0 ? 2.05 2.25 v f osc = 10 khz duty cycle = 0% input threshold voltage vt100 1.20 1.45 ? vf osc = 10 khz duty cycle = 100% input sink current isink 0.5 1.6 ? ma v o (pin 5, 12) = 1.25 v input source current isource ?- 70 - 45 m av o (pin 5, 12) = 1.25 v total current item symbol min typ max unit test conditions standby current iccs ? 1.5 2.0 ma output off-state average supply current icca ? 1.9 2.6 ma r t = 10 k w s cp (pin 15) = 0 v test circuit 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ha17451a 1 f note c 330 pf t r 10 k t w sw 1 c pe v cc r l r l output 1 output 2 note: connect a phase compensating capacitor (at least 1 f) to vref.
ha17451ap/afp 9 characteristic curves 3.0 2.5 2.0 1.5 1.0 0.5 0 i = 1 ma ta = 25 c out 0 10 20 30 40 reference output voltage vs. supply voltage supply voltage v cc (v) reference output voltage vref (v) drop-out voltage vdrop (v) output transistor ?n?duty (%) open loop gain a v (db) phase variation f (deg.) variation r tc (%) reference output voltage variation vs. ambient temperature ambient temperature ta ( c) frequency (hz) ambient temperature ta ( c) dead time input voltage v d.t.c (v) drop-out voltage vs. ambient temperature open loop gain, phase variation vs. frequency output transistor ?n?duty vs. dead time input voltage (1) 1.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?0 0 25 50 75 85 v cc = 6 v i out = 1 ma 16 15 141312 11 10 9 1 2 34 5 6 78 ha17451a a v 1 ma 0.4 0.3 0.2 0.1 0 ?0 0 25 50 75 85 vdrop = v ?vref (v = 3 v) v : vref (v = 3 v) ?vref (x) > 5 mv cc (x) cc (x) cc cc 100 1 k 10 k 100 k 1 m 10 m 100 90 80 70 60 50 40 30 20 10 0 v = 6 v ta = 25 c cc av f output transistor ?n?duty (%) dead time input voltage v d.t.c (v) output transistor ?n?duty vs. dead time input voltage (2) 0 20 40 60 80 100 1.00 1.25 1.50 1.75 2.00 2.25 v = 6 v c = 33000 pf r = 39 k f = 0.8 khz ta = 25 c cc t t w osc 0 20 40 60 80 100 1.00 1.25 1.50 1.75 2.00 2.25 v = 6 v c = 330 pf r = 10 k f = 200 khz ta = 25 c cc t t osc w
ha17451ap/afp 10 oscillator frequency variation vs. ambient temperature oscillator frequency vs. timing resistance standby current vs. supply voltage supply voltage v cc (v) i o (ma) t r , t f vs. i o undervoltage lockout threshold voltage vs. ambient temperature 15 10 5 0 ? ?0 ?5 ?0 0 25 50 75 85 w v = 6 v r = 10 k c = 330 pf f = 200 khz cc t t osc c = 330 pf c = 3300 pf c = 33000 pf c =150 pf t 300 100 10 1 5 10 100 v = 6 v ta = 25 c cc t t t ta = ?0 c ta = 25 c ta = 85 c 16 15 14 13 12 11 10 9 1 2 34 5 6 78 ha17451a a 7 6 5 4 3 2 1 0 010203040 16 15 141312 11 10 9 1 2 34 5 6 78 ha17451a 4.0 3.5 3.0 2.5 2.0 200 25507585 vth vti ambient temperature ta ( c) ambient temperature ta ( c) timing resistance (k w ) variation (%) standby current i ccs (ma) t r , t f ( m s) undervoltage lockout threshold voltage vth, vtl (v) oscillator frequency (khz) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 10 20 30 40 50 0 v = 6 v c = 330 pf r = 10 k ta = 25 c w t t pin 7 or pin 10 t r t f 90% 10% t f t r cc
ha17451ap/afp 11 timing waveforms dead time input voltage triangle oscillator output error amp output output standstill reference output of short-circuit protection comparator output transistor base waveform (internal) output transistor collector waveform (out1, out2) protection enable waveform (scp) short-circuit protection comparator output (internal) reference voltage (vref ) undervoltage lockout release point supply voltage (v ) cc power-on undervoltage lockout notes: voltages shown in diagram are typical values. 2.05 v 1.6 v 1.45 v 1.23 v 100% high low high (off) low (on) 0.61 v 0.19 v high low 2.5 v v min 3.3 v cc 0 v 3.15 v 1.5 v 1.7 v 2.7 v 2.5 v ?internal waveform timing diagram
ha17451ap/afp 12 typical system configurations step-down output circuit switching transistor step-up output circuit (using transistor in ic as switching element) step-up output circuit s.c.p disable (using external transistor as switching element) inverting output circuit units r: c: l: f h w c3 13 k 0.47 c2 4.7 r3 r4 18 k c4 470 p r5 1.8 k q1 2sb857 l1 hrp24 d1 l2 r6 36 k r7 12 k c5 1000 v = 5 v out d2 hrp22 r12 33 k r13 3.9 k c8 100 r11 30 k r10 15 k c6 0.47 r 18 k t c t c7 r1 33 k r2 33 k c1 2.2 16 1 15 2 14 3 13 4 12 5 11 6 10 7 9 8 ha17451a v = 12 v out + + + + + + + + + + c2 2.2 r3 r4 33 k 33 k r1 3.9 k r2 10 k c1 0.47 63 k r9 c t r 18 k t 470 p c6 r10 470 k r12 820 k l2 r11 2.2 k q2 2sb857 d2 hrp24 c7 470 v = 15 v out v = ?5 v out c5 470 75 k 6.8 k r7 r8 d1 hrp24 l1 q1 r6 2.2 k c4 10 r5 c3 470 k 470 p 16 1 15 2 14 3 13 4 12 5 11 6 10 7 9 8 ha17451a v = 9 v in v = 9 v in + 470 p ?dual-output dc/dc converter 2sb857 2000 p 2000 p
ha17451ap/afp 13 precautions precaution concerning inverting (negative voltage) output conditions circuit diagram r + r > |v | v 18 a out to prevent leakage current in the ic from interfering with stable and efficient operation, choose r and r values that satisfy the following condition: where, r , r : |v |: 18 a: feedback voltage resistors absolute value of negative output voltage minimum current with negative voltage at reference voltage pin; i (min) out v in v cc out ? out + r r vref iref iref inv. input ha17451a negative dc output i (min) or ?.2 v 0 v vref or 18 a 2 1 12 1 2 12
ha17451ap/afp 14 package dimensions hitachi code jedec eiaj mass (reference value) dp-16 conforms conforms 1.07 g unit: mm 6.30 19.20 16 9 8 1 1.3 20.00 max 7.40 max 7.62 0.25 + 0.13 ?0.05 2.54 0.25 0.48 0.10 0.51 min 2.54 min 5.06 max 0 ?15 1.11 max hitachi code jedec eiaj mass (reference value) fp-16da conforms 0.24 g unit: mm *dimension including the plating thickness base material dimension *0.22 0.05 *0.42 0.08 0.12 0.15 m 2.20 max 5.5 10.06 0.80 max 16 9 1 8 10.5 max + 0.20 ?0.30 7.80 0.70 0.20 0 ?8 0.10 0.10 1.15 1.27 0.40 0.06 0.20 0.04
ha17451ap/afp 15 cautions 1. hitachi neither warrants nor grants licenses of any rights of hitachi? or any third party? patent, copyright, trademark, or other intellectual property rights for information contained in this document. hitachi bears no responsibility for problems that may arise with third party? rights, including intellectual property rights, in connection with use of the information contained in this document. 2. products and product specifications may be subject to change without notice. confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. hitachi makes every attempt to ensure that its products are of high quality and reliability. however, contact hitachi? sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. design your application so that the product is used within the ranges guaranteed by hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail- safes, so that the equipment incorporating hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the hitachi product. 5. this product is not designed to be radiation resistant. 6. no one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from hitachi. 7. contact hitachi? sales office for any questions regarding this document or hitachi semiconductor products. hitachi, ltd. semiconductor & integrated circuits. nippon bldg., 2-6-2, ohte-machi, chiyoda-ku, tokyo 100-0004, japan tel: tokyo (03) 3270-2111 fax: (03) 3270-5109 copyright ? hitachi, ltd., 2000. all rights reserved. printed in japan. hitachi asia ltd. hitachi tower 16 collyer quay #20-00, singapore 049318 tel : <65>-538-6533/538-8577 fax : <65>-538-6933/538-3877 url : http://www.hitachi.com.sg url northamerica : http://semiconductor.hitachi.com/ europe : http://www.hitachi-eu.com/hel/ecg asia : http://sicapac.hitachi-asia.com japan : http://www.hitachi.co.jp/sicd/indx.htm hitachi asia ltd. (taipei branch office) 4/f, no. 167, tun hwa north road, hung-kuo building, taipei (105), taiwan tel : <886>-(2)-2718-3666 fax : <886>-(2)-2718-8180 telex : 23222 has-tp url : http://www.hitachi.com.tw hitachi asia (hong kong) ltd. group iii (electronic components) 7/f., north tower, world finance centre, harbour city, canton road tsim sha tsui, kowloon, hong kong tel : <852>-(2)-735-9218 fax : <852>-(2)-730-0281 url : http://www.hitachi.com.hk hitachi europe ltd. electronic components group. whitebrook park lower cookham road maidenhead berkshire sl6 8ya, united kingdom tel: <44> (1628) 585000 fax: <44> (1628) 585160 hitachi europe gmbh electronic components group dornacher stra b e 3 d-85622 feldkirchen, munich germany tel: <49> (89) 9 9180-0 fax: <49> (89) 9 29 30 00 hitachi semiconductor (america) inc. 179 east tasman drive, san jose,ca 95134 tel: <1> (408) 433-1990 fax: <1>(408) 433-0223 for further information write to: colophon 2.0

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