AP1511 pwm control 5a step-down converter this datasheet contains new product information. anachip corp. re serves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. rev. 1.5 apr 10, 2006 1/5 ? features - input voltage: 3.6v to 23v. - output voltage: 0.8v to v cc . - duty ratio: 0% to 100% pwm control - oscillation frequency: 300khz typ. - soft-start, current limit, enable function - thermal shutdown function - built-in internal sw p-channel mos - sop-16l pb-free package. ? applications -microprocessor core supply -networking power supply -lcd mnt, tv power supply -telecom power supply ? general description AP1511 consists of step-down switching regulator with pwm control. these devices include a reference voltage source, oscillation circuit, error amplifier, internal pmos and etc. AP1511 provides low-ripple power, high efficiency, and excellent transient characteristics. the pwm control circuit is able to vary the duty ratio linearly from 0 up to 100%. this converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. an enable function, an over current protect function and a short circuit protect function are built inside, and when ocp or scp happens, the operation frequency will be reduced from 300khz to 30khz. also, an internal compensation block is built in to minimum external component count. with the addition of an internal p-channel power mos, a coil, capacitors, and a diode connected externally, these ics can function as step-down switching regulators. they serve as ideal power supply units for portable devices when coupled with the sop-16l mini-package, providing such outstanding features as low current consumption. since this converter can accommodate an input voltage up to 23v, it is also suitable for the operation via an ac adapter. ? pin assignments AP1511 1 2 3 15 14 13 12 11 10 9 8 7 6 5 4 16 (top view) sop-16l gnd gnd nc nc v c pvcc output output gnd gnd fb en ocset vcc output output ? pin descriptions pin name pin no. description gnd 1 gnd pin gnd 2 gnd pin fb 3 feedback pin en 4 h: normal operation l: step-down operation stopped ocset 5 add an external resistor to set max output current. vcc 6 signal vcc output 7 switch output pin output 8 switch output pin output 9 switch output pin output 10 switch output pin pvcc 11 power vcc v c 12 voltage clamp pin nc 13 not connected nc 14 not connected gnd 15 gnd pin gnd 16 gnd pin
AP1511 pwm control 5a step-down converter anachip corp. www.anachip.com.tw rev. 1.5 a pr 10, 2006 2/5 ? ordering information ap 1511 x x package packing s: sop-16l blank : tube a : taping ? block diagram oscillation circuit reference voltage source with soft start pwm - switched control circuit + - vss en vccp output 100 ua ocset fb v c vcc ct v en driver thermal shutdown ? absolute maxi mum ratings symbol parameter rating unit v cc v cc pin voltage v ss - 0.3 to v ss + 25 v v fb v out pin voltage v ss - 0.3 to v cc v v en en pin voltage v ss - 0.3 to v cc + 0.3 v v output switch pin voltage v ss - 0.3 to v in + 0.3 v p d power dissipation (note) internally limited mw t opr operating temperature range -20 to +125 o c t stg storage temperature range -40 to +150 o c caution: the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefore not be exceeded under any conditions. note: due to the ic and sbd and inductor were hot in high current, if you need to reduce the operation temperature that you must increase the component space or thermal dissipation space.
AP1511 pwm control 5a step-down converter anachip corp. www.anachip.com.tw rev. 1.5 a pr 10, 2006 3/5 ? electrical characteristics (v in = 12v, t a =25c, unless otherwise specified) symbol parameter conditions min. typ. max. unit v in input voltage -- 3.6 - 23 v v fb feedback voltage -- 0.784 0.8 0.816 v i fb feedback bias current i out =0.1a - 0.1 0.5 a i sw switch current -- 5.5 - - a i sss current consumption during power off v en =0v - 10 - a ? v out /v out line regulation v in = 3.6v~23v - 1 2 % ? v out /v out load regulation i out = 0 to 5a - 0.5 1 % f osc oscillation frequency measure waveform at sw pin 240 300 360 khz f osc1 frequency of current limit or short circuit protect measure waveform at sw pin 10 - - khz v sh evaluate oscillation at sw pin 2.0 - - v sl power-off pin input voltage evaluate oscillation stop at sw pin - - 0.8 v i sh -- - 20 - a i sl power-off pin input leakage current -- - -10 - a i ocset ocset pin bias current -- 75 90 105 a t ss soft-start time -- 0.3 2 5 ms v in =5v, v fb =0v - 70 100 r dson internal mosfet rdson v in =12v, v fb =0v - 50 70 m ? effi efficiency v in = 12v, v out = 5v i out = 5a - 90 - % ja thermal resistance junction-to-ambient - 50 - o c/w ? typical application circuit AP1511 en c c d1 fb output r ocset ocset pvcc vcc v c cvcc c en 20k 0.1uf r en c in c out optional v ss c ocset v in r b r a v out note: v out = v ref x (1+r a /r b ) r b =1k~10k ohm 470uf c 0.1uf 6.8k 1.3k l1 15uh 0.1uf 680uf 3k 2.2 0.1uf c v in =12v, i max =5a v out 2.5v 3.3v 5v l1 value 10uh 12uh 15uh
AP1511 pwm control 5a step-down converter anachip corp. www.anachip.com.tw rev. 1.5 a pr 10, 2006 4/5 ? typical performance characteristics efficiency (vin=+5v) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.0 1.0 2.0 3.0 4.0 5.0 6.0 iout (a) efficiency (%) vout:3.3v efficiency (vin=+12v) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.0 1.0 2.0 3.0 4.0 5.0 6.0 iout (a) efficiency (%) vout:3.3v vout:5.0v ? test circuit a fb vcc vss en open open fb vcc vss en + - oscillation output output a fb vcc vss en + - + - v output ocset ocset ocset pvcc pvcc pvcc enable function test feedback function test operation function test ? function description pwm control the AP1511 consists of dc/dc converters that employ a pulse-width modulation (pwm) system. in converters of the AP1511, the pulse width varies in a range from 0 to 100%, according to the load current. the ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current.
AP1511 pwm control 5a step-down converter anachip corp. www.anachip.com.tw rev. 1.5 ap r 10, 2006 5/5 ? marking information ( top view ) sop-16l 1 9 8 AP1511 yy ww x logo id code: internal year: "01" = 2001 "02" = 2002 xth week: 01~52 ~ 16 part no. ? package information package type: sop-16l e h view "a" l 0.015x45 o c 7 o (4x) view "a" a a1 d b e 7 o (4x) y a2 dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.40 1.60 1.75 0.055 0.063 0.069 a1 0.10 - 0.25 0.040 - 0.010 a2 1.30 1.45 1.50 0.051 0.057 0.059 b 0.33 0.41 0.51 0.013 0.016 0.020 c 0.19 0.20 0.25 0.0075 0.008 0.0098 d 9.80 9.90 10.00 0.386 0.390 0.394 e 3.80 3.90 4.00 0.150 0.154 0.157 e - 1.27 - - 0.050 - h 5.80 6.00 6.20 0.228 0.236 0.244 l 0.38 0.71 1.27 0.015 0.028 0.050 0 - 8 0 - 8
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