pme02-series ? psrs-78xxlf ? switching regulator ? smd ? plastic case specification can change without a notice ? we acce pt no liability for any inaccuracy or printing erro rs. page 1/4 psrs-78xxlf all specifications typical at ta=25c, nominal inpu t voltage and full load unless otherwise specified input specifications voltage range wide input (see table) output specifications voltage accuracy (100% load) 2%, typ. short circuit protection continuous (hiccup / automatic recovery) line regulation 0.2%, typ. load regulation (10% - 100% load) 0.3%, typ. ripple and noise (20mhz bandwidth) 25 mv pk-pk, max. output current limit 1.8 a temperature coefficient 0.02% / c general specifications dynamic load stability (100% <-> 10% load) 30 mv, typ. quiescent current (nom. input, 3.3 and 5 vout) 15 ma, typ thermal shutdown 160c capacitance load 1000 uf, max. on/off control current on: open or 1.5 pme02-series ? psrs-78xxlf ? switching regulator ? smd ? plastic case specification can change without a notice ? we acce pt no liability for any inaccuracy or printing erro rs. page 2/4 selection guide order # i n p u t v o l t a g e n o m . ( v d c ) i n p u t v o l t a g e r a n g e ( v d c ) o u t p u t n o r m a l ( v d c ) o u t p u t a d j u s t r a n g e ( v d c ) c u r r e n t m a x . ( m a ) e f f i c i e n c y m a x . ( % ) psrs-783r3lf 12 4.5 - 28 3.3 1.8 - 5.5 500 90 psrs-7805lf 12 6.0 - 28 5 2.5 - 8.0 500 94 PSRS-7812LF 24 14 - 28 12 4.5 - 13.5 500 95 psrs-7815lf 24 17 - 28 15 4.5 - 15.5 500 96 if you need other specifications, please enquire. notes:
pme02-series ? psrs-78xxlf ? switching regulator ? smd ? plastic case specification can change without a notice ? we acce pt no liability for any inaccuracy or printing erro rs. page 3/4 package / pinning / derating 11.82 (0.47) 8.50 (0.34) 71 85 100% 75% 50% 25% 40 20 0 20 40 60 80 100 outputpower ambienttemperature(c) temperaturederatinggraph # switching reg. 1 +vin 5 +vout 6 vadj 7 gnd 9 gnd 10 on/off others omitted pin connections 0 50 100 150 200 250 time (s ec .) t e m p e r a t u r e ( c ) 9 0 m a x (>2 2 0 c) s e c 220 c 10 max s ec p eak.temp 240 c external capacitor table part number c1 (ceramic cap.) c2 (ceramic cap.) psrs-783r3lf 10uf/50v 22uf/16v psrs-7805lf 10uf/50v 22uf/16v PSRS-7812LF 10uf/50v 10uf/25v psrs-7815lf 10uf/50v 10uf/25v k7805t-500 1 7 ,9 5 vin gnd vout c2 226k/25v 106k/50v c1 6 1 0 on/of f r1 r2 gnd 470pf c 3 100 f c5 1. c1,c2: choose a ceramic type capacitors; c3 is require ,for best performance, use a 100f or more capacitor please. 2. c1,c2 are require and should be placed close to the pins of the converter, with shortest possible traces. 3. no parallel connection or plug and play. *l: to reduce output ripple, it is recommended to a dd a lc filter to output port. recommended paramete r: 10h ~ 47h. psrs - 7805lf *l
pme02-series ? psrs-78xxlf ? switching regulator ? smd ? plastic case specification can change without a notice ? we acce pt no liability for any inaccuracy or printing erro rs. page 4/4 app notes the on/off pin provides several features for adjust ing and sequencing the power supply, a user has the flexibility of using the on/off pin as: 1) a digital on/off control by pulling down the on/ off pin with an open-drain transistor. on/off 2) line uvlo. if desired to achieve a uvlo voltage , an resistor divider from vin to on/off to gnd can be used to disable the converter until a higher input voltage is achieved. for example, it is not useful for a converter with 12v output to start up with a 12v input voltage, as the output cannot teac h regulation. to enable the converter when the input voltage reaches 14v, a 51k /5k resistor divider from vin to gnd can be connected to the on/off pin. both the precision 1.25v threshold and 150mv hysteresis are multiplied by the resistor ratio, pr oviding a proportional 12% hysteresis for any start up threshold. so, the turn off threshold would be betw een 12.3v to 15.7v. 7,9 5 vin gnd +vout 100 f 1 dc/dc converter c1 6 470pf 10 51k 5k load 2) power supply sequencing. by connecting a small c apacitor from on/off to gnd, the 2 a current source and 1.25v threshold can provide a stable and predictable delay between start-up of multiple power supplies. for example, a start-up de lay of roughly 64ms is provided using 100nf, and roughly 136ms by using 200nf. 7,9 5 vin gnd +vout 100 f 1 d c/dc converter c1 6 470pf 10 100nf c5 load 7,9 5 vin gnd +vout 100 f 1 d c/d c converter c1 6 470pf 10 200nf c5 load delay time: 64ms delay time: 136ms part # vout (nominal) vout adjust up r2 (kohm) vout adjust down r1 (kohm) psrs-783r3lf 3.3 = = psrs-7805lf 5 = = PSRS-7812LF 12 = = psrs-7815lf 15 = = the r1, r2 which choose from the table 1 equation are used to set th e output voltage. select the r1 or r2 resistor to provide the desired regulation voltage. r1 is used to set the output voltage to lower, r2 is used to set the output voltage to higher. if no need to adjust the outp ut voltage, please connect a ceramic capacitor to gnd with 470pf typical value. insure the o utput voltage is in the adjust range. 3 . 3 * 10 10. 75 ? ? vout vout 5 * 10 52. 91 ? ? vout vout 12 * 20 02. 287 ? ? vout vout 15 * 15 37. 269 ? ? vout vout vout vout ? ? 3 . 3 10. 75 * 61 vout vout ? ? 5 52. 91 * 61 vout vout ? ? 12 02. 287 * 71 vout vout ? ? 15 37. 269 * 66
|
