unisonic technologies co., ltd p2576 linear integrated circuit www.unisonic.com.tw 1 of 8 copyright ? 2011 unisonic technologies co., ltd qw-r101-025.g 3a step-down voltage switching regulator ? description as a step-down (buck) switching regulator, the utc p2576 provides drives 3a load. the utc p2576 are simple because it only needs to use a minimum number of external components. frequency compensation and a fixes-frequency oscillator are in it. utc p2576 can perform with standard inductors, and simplifying the switch mode power supplies? design. utc p2576 guarantees output load conditions and 10% on the oscillator frequency. its external shutdown is included with 50 a standby current. as well as thermal shutdown for full protection under fault conditions, the output switch has cy cle by cycle current limiting. ? features * output current 3a * input voltage range from 7v to 40v * requires 4 external components * very high efficiency * ttl shutdown * low power standby mode * thermal shutdown, * current limit protection * internal oscillator: 52 khz fixed frequency to-220b 1 1 to-263-5 sop-8 hsop-8 to-220-5 1 ? ordering information ordering number package packing lead free halogen free p2576l-xx-ta5-t P2576G-XX-TA5-T to-220-5 tube p2576l-xx-tb5-t p2576g-xx-tb5-t to-220b tube p2576l-xx-tq5-r p2576g-xx-tq5-r to-263-5 tape reel p2576l-xx-tq5-t p2576g-xx-tq5-t to-263-5 tube p2576l-xx-s08-r p2576g-xx-s08-r sop-8 tape reel p2576l-xx-s08-t p2576g-xx-s08-t sop-8 tube p2576l-xx-sh2-r p2576g-xx-sh2-r hsop-8 tape reel p2576l-xx-sh2-t p2576g-xx-sh2-t hsop-8 tube note: xx: output voltage, refer to marki ng information.
p2576 linear integrated circuit unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r101-025.g ? pin configuration of sop-8/hsop-8 1 gnd fb gnd gnd gnd 2 3 4 5 6 7 8 v in v out on/off ? pin descriptions for sop-8/hsop-8 pin no. pin name pin description 1 v in input voltage 2 v out output voltage 3 fb feed back. 4 off / on off / on select pin, when connected to the ground th e chip in operating normally. 5,6,7,8 gnd ground for to-220b/to-220-5/to-263-5 pin no. pin name pin description 1 v in input voltage 2 v out output voltage 3 gnd ground 4 fb feed back. 5 off / on off / on select pin, when connected to the ground th e chip in operating normally. ? marking information package voltage code marking to-220b to-220-5 to-263-5 50:5.0v ad:adj
p2576 linear integrated circuit unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r101-025.g ? block diagram
p2576 linear integrated circuit unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r101-025.g ? absolute maximum ratings (t a =25c, unless otherwise specified) parameter symbol ratings units supply voltage v cc 40 v maximum supply voltage v cc ( max ) 45 v off / on pin input voltage v on/off -0.3 ~ v in v output voltage to gr ound (steady state) v out -1.0 v power dissipation p d internally limited mw junction temperature t j +150 c operating temperature t opr -40 ~ +125 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (t j =25c, v in =12v, i load =500ma.) parameter symbol test conditions min typ max unit p2576 - 5.0v feedback voltage v out v in =12v, i load =0.5a 4.900 5.0 5.100 v 8v v in 40v, 0.5a i load 3.0a 4.800 5.0 5.200 v efficiency v in = 12 v, i load =3.0 a 77 % p2576 - adj feedback voltage v fb v in =12v, i load =0.5a, v out =5v 1.217 1.23 1.243 v 8v v in 40v, 0.5a i load 3.0a, v out =5v 1.193 1.23 1.267 v efficiency v in = 12 v, i load =3.0 a, v out =5v 77 % all output voltage oscillator frequency f osc (note 4) 42 52 63 khz saturation voltage v sat i out =3a (note 1) 1.4 1.8 v max duty cycle (on) dc (note 2) 93 98 % current limit i limit (note 1, 4) 4.2 5.8 6.9 a output leakage current i i(leak) v in =40v, output=-1v (notes 3) 2 ma output=-1v 7.5 30 ma quiescent current iq (note 6) 5 10 ma standby quiescent current i stby off / on pin=5v (off) 50 200 a on/off pin logic input level v ih v out =0v 2.2 1.4 v v il v out =nominal output voltage 1.2 1.0 v on/off pin input current i i off / on pin=5v (off) 12 30 a i il off / on pin=5v (on) 0 10 a notes: 1. 2. 3. 4. output pin sourcing current. no diode, in ductor or capacitor connected to output. feedback pin removed from output and connected to 0v. feedback pin removed from output and connected to +12v, to force the output transistor off. the oscillator frequency reduces to approximately 11 kh z in the event of an output short or an overload which causes the regulated output voltage to drop appr oximately 40% from the nomin al output voltage. this self- protection feature lowers the average power dissipation of p2576 by lowering the minimum duty cycle from 5% down to approximately 2%.
p2576 linear integrated circuit unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r101-025.g ? application circuit feedback v in gnd + c i 100 f on/off output l 1 100 h +5v 3a load + c o 680 f 1n5822 d 1 dc input p2576
p2576 linear integrated circuit unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r101-025.g ? typical test circuit v in gnd c i 100 f + feedback output l 1 v out + c o 680 f mbr360 d 1 100 h load on/off p2576 v in unregulated dc input c i : 100 f, 75v c o : 680 f, 25v d 1 : schottky, mbr360 l 1 : 100 h r 1 : 2k, 0.1% r 2 : 6.12k, 0.1% v in utc p2576 - adj r1 r2 output l1 c out 680 f v out =5.0 v gnd on/off v in mbr360 d 1 + 7v-40v unregulated dc input c in 100 f load 100 h feedback note: ) r r ( v v ref out 1 2 1 + = ) v v ( r r ref out 1 1 2 ? = (where v ref =1.23v, r1 between 1k and 5k.)
p2576 linear integrated circuit unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r101-025.g ? typical application circuit (t a =25c, v cc =12v, unless otherwise specified) saturation voltage (v) output current (a) dropout voltage 2.0 1.5 1.0 0.5 -75 0 25 125 150 junction temperature (c) input-output differential (v) -50 -25 100 50 75 0 20 0 input voltage (v) quiescent current (ma) 8 18 16 14 12 10 10 20 30 40 50 60 quiescent current v out =5v, measured at ground pin t =25c 22 24 i load =3a i load =0.2a standby quiescent current 75 60 50 40 0 25 125 junction temperature (c) -50 -25 100 50 75 30 standby quiescent current (a) 70 on/off pin:5v v in =40v v in =12v output voltage deviation(v) time(ms) load transient response load current(a) 0 -1 1 0.01 3 0 0.4 1.2 1.6 2.0 2.4 2.8 0.8 3.6 4.0 3.2 v in =12v, v out =5v@3a
p2576 linear integrated circuit unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r101-025.g ? typical application circuit(cont.) 20.0 0 0 duty cycle ( ) quiescent current (ma) 2.5 5.0 17.5 15.0 12.5 10.0 7.5 20 40 60 80 100 quiescent current vs. duty cycle 20.0 0 duty cycle () feedback voltage change (mv) -15.0 -10.0 15.0 10.0 -5.0 20 40 60 80 100 feedback voltage vs duty cycle 5.0 0 -20.0 i load =0.5a 40.0 22.5 25.0 37.5 35.0 32.5 30.0 27.5 adjustable version only v in =7v v in =40v feedback pin current (na) output voltage(v) inductor current(a) utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior writ ten consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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