200807041 this datasheet contains new product information. advanced power electronics corp. reserves 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. ape1809 pwm control 5a step-down converter ? general description ape1809 consists of step-down switching regulator with pwm control. these devise include a reference voltage source, osc illation circuit, error amplifier, internal pmos and etc. ape1809 provides low-ripple power, high efficiency, and excellent transient characteristics. the pwm control circuit is able to very the duty ratio linearly form 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 short circuit protect function are built inside, and when ocp or scp happens, the operation frequency will be reduced. 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 f unction as step-down switching regulators. they serve as ideal power supply units fo r portable devices when coupled with the sop-8l package, providing su ch 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. ? features - input voltage 4.0v to 23v - output voltage 0.8v to vcc - duty ratio 0% to 100% pwm control - oscillation frequency 330khz typ. - soft-start(ss), current limit(cl), enable function. - thermal shutdown function. - short circuit protect (scp). - built-in internal sw p-channel mos. - low esr output capacitor (multi-layer chip capacitor (mlcc)) application. - pdip-8l pb-free package. adva nced power electronics corp. 1
2 ape1809 ? block diagram vcc oscillator circuit reference voltage pwm switched control circuit + - vss v en en comp fb thermal shutdown sw with soft start ocset 110ua ? pin assignmet the package of ape1809 is pdip-8l; t he pin assignment is given by: name description en power-off pin h ? normal operation(step-down) l ? step-down operation stopped (all circuits deactivated) comp compensation pin ocset add an external resistor to set max switch output current. v cc ic power supply pin sw switch pin. connect external inductor/diode here. v ss gnd pin ( top view ) 1 2 3 4 8 7 6 5 fb sw ocset pdip-8l ape1809 sw en vss comp v cc fb feedback pin ? order/marking information order information top marking package type d: pdip-8l ape1809x ywwsss 1809d part number id code: internal ww: 01~52 yea r : 6 = 2006 adva nced power electronics corp.
3 ape1809 ? absolute maximum ratings (at ta=25 : ) characteristics symbol rating unit vcc pin voltage v cc v ss - 0.3 to v ss + 25 v feedback pin voltage v fb v ss - 0.3 to v cc v on/off pin voltage v en v ss - 0.3 to v cc + 0.3 v switch pin voltage v sw v ss - 0.3 to v cc + 0.3 v power dissipation pd internally limited mw storage temperature range t st -40 to +150 ?
4 ape1809 ? application circuit 1. mlcc c2 22uf r1 6.8k l1 1 2 c6 0.1uf ape1809 1 2 3 4 5 6 7 8 fb en comp vcc sw sw vss ocset c5 c1 1nf c4 r3 15k r5 2.0k r2 1.3k vout=5v5a c7 1.8nf d1 b540 vfb = 0.8 v ; r2 suggest 0.8k ~ 3.0k vout = vfb x on/off vcc+12v c8 22uf 0.1uf 0.1uf ( r1 r2 1 + ) option 22uh r4 100k x2 x2 c3 0.1uf c9 0.1u compensation capacitor selection(mlcc) vin v out r3 c7 c1 c9 12v 2.5/3.3/ 5.0v 15k 1800pf 1nf open 5v 3.3/2.5/1.8v 15k 1800pf 1nf open 2. el cap c2 470uf r1 30k l1 1 2 c6 0.1uf ape1809 1 2 3 4 5 6 7 8 fb en comp vcc sw sw vss ocset c8 c1 1nf c4 r3 3.9k r5 2.0k r2 5.6k vout=5v5a c7 10nf d1 b540 vfb = 0.8 v ; r2 suggest 0.8k ~ 6.0k vout = vfb x on/off vcc+12v 470uf 0.1uf 0.1uf ( r1 r2 1 + ) option 15uh r4 100k c3 0.1uf c8 c9 22nf compensation capacitor selection(al cap) vin v out r3 c7 c1 c9 5-16v 5/3.3/2.5/1.8v 3.9k 10nf 1nf open l1 recommend value (v in =12v) v out 1.8 v 2.5v 3.3v 5v i out =3a 12uh 15uh 18uh 22uh i out =5a 8uh 10uh 12uh 15uh adva nced power electronics corp.
5 ape1809 ? function descriptions pwm control the ape1809 consists of dc/dc converters that employ a pulse-width modulation (pwm) system. in converters of the ape1809, the pulse width varies in a range from 0 to 100%, according to the load current. the ripple volt age produced by the switching can easily be removed through a filter because the switch ing frequency remains constant. therefore, these converters provide a low-ripple powe r over broad ranges of input voltage and load current. rds(on) current limiting the current limit threshold is setting by t he external resistor (r5) connecting from v cc supply to ocset pin. the internal 110ua si nk current crossing the resistor sets the voltage at pin of ocset. when the pwm volt age is less than the voltage at ocset, an over-current condition is trigger ed. please refer to the formula for setting the current limit value: r i i ds(on) ocset sw(max) 11 . 0 r3 + = ? ? ? ? ? ? + = 2 1 1 8 . 0 r r v v out table 1 resistor select for output voltage setting v out r2 r1 1.3k 6.8k 5v 5.6k 30k 1.5k 4.7k 3.3v 5.6k 18k 2.2k 4.7k 2.5v 5.6k 12k 1.8v 2k 2.5k adva nced power electronics corp.
6 ape1809 pcb layout guide if you need low tc & tj or large pd(power dissipation), the dual sw pins(5&6) on the pdip-8l package are internally connected to die pad, the pcb layout should allow for maximum possible copper area at the sw pins. 1. connect c3 to v cc pin as closely as possible to get good power filter effect. 2. connect r5 to v cc pin as closely as possible. 3. connect ground side of the c2 & d1 as closely as possible. adva nced power electronics corp.
7 ape1809 ? typical characteristics vfb vs vin iccq vs vin vfb vs vin 0.785 0.790 0.795 0.800 0.805 0.810 0.815 3 5 7 9 11 13 15 17 19 21 23 25 vin(v) vfb(v) iccq v s v in 0.0 1.0 2.0 3.0 4.0 5.0 6.0 3 5 7 9 11 13 15 17 19 21 23 25 vin(v) iccq(ma ) fosc vs vin fosc vs temperature fosc vs vin 280.0 300.0 320.0 340.0 360.0 380.0 3 5 7 9 11 13 15 17 19 21 23 25 vin(v) fosc(khz) fosc vs temperature 290.0 300.0 310.0 320.0 330.0 340.0 350.0 -20 0 20 40 60 80 100 120 temp ( : ) fosc(khz) vfb vs temperature iccq vs temperature vfb vs temperature 0.785 0.790 0.795 0.800 0.805 0.810 0.815 -20 0 20 40 60 80 100 120 temp ( : ) vfb(v) iccq vs temperature 0.0 1.0 2.0 3.0 4.0 5.0 6.0 -20 0 20 40 60 80 100 120 temp ( : ) iccq(ma ) adva nced power electronics corp.
8 ape1809 ? typical characteristics output ripple (v in =12v, v out =5.0v, i out =5a) power on test wave (v in =12v, v out =5v, i out =5a ) load transient response (v in =12v, v out =5v, i out =0.2~5a) en on test wave (v in =12v, v out =5v, i out =5a ) efficiency (v in =12v, v out =5v) vou t=5 v 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.0 1.0 2.0 3.0 4.0 5.0 iout(a) efficiency(%) sw i out sw i sw v out v in sw i out sw i sw v out v in v out (ac) v out (ac) adva nced power electronics corp.
9 ape1809 ? typical characteristics (mlcc) output ripple (v in =12v, v out =3.3v, i out =3a) power on test wave (v in =12v, v out =5v, i out =3a ) load transient response (v in =12v, v out =5v, i out =0.1~3a) en on test wave (v in =12v, v out =5v, i out =3a ) efficiency (v in =12v, v out =5v) efficiency (v out =3.3v) vou t=5 v 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.0 0.5 1.0 1.5 2.0 2.5 3.0 iout(a) efficiency(%) vou t=3 .3 v 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0.00.51.01.52.02.53.0 iout(a) efficiency(%) vin =1 2 v vin=5.0v sw i sw sw i sw v out v in sw i out sw i sw v out v in v out (ac) v out (ac) adva nced power electronics corp.
package outline : pdip-8 millimeters min nom max a 3.60 4.50 5.40 a1 0.38 ---- ---- a2 2.90 3.95 5.00 b 0.36 0.46 0.56 b1 1.10 1.45 1.80 b2 0.76 0.98 1.20 c 0.20 0.28 0.36 d 9.00 9.60 10.20 e 6.10 6.65 7.20 e1 7.62 7.94 8.26 e2 8.30 9.65 11.00 e l 3.18 ---- ---- 1.all dimensions are in millimeters. 2.dimension does not include mold protrusions. ?? part marking information & packing : pdip-8 2.540 bsc symbol s advanced power electronics corp. 10 part numbe r date code (ywwsss) y 1809d ywwsss
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