1 - 5w primary side cc regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 1 pt4225_ds rev en1.1 pt 4225 general description t h e pt 4225 is primary side constant current regulator, which is designed for high performance and cost - effective led lighting applications. w ith powtech s proprietary constant current compensation technique accurate outpu t current regul ation is achieved without the need of a secondary feedback circuitry. i ntegrated primary inductance compensation circuitry provides accurate constant current operation despite variations in primary inductance. excellent emi p erformance is achieved with fre quency j ittering function together with soft driving control at totem pole gate drive output. the device integrates a high voltage power switch, a n oscillator, a current sense circuit, cc control circuit . it also features a c omplete set of integrated prote ction functions to protect against all fault conditions including output open/ short circuit, line under - voltage, and over temperature shut down. the pt 4225 is available in an so p - 7 package. f eatures ? cc w ithout s econdary f eed back ? i ntegrates 600v power swit ch ? i nductance compensation ? low startup current (< 10 a) ? adjustable primary side current limit ? v cc /fb over voltage protection ? vcc/fb uvlo ? feedback loop open circuit protection ? over temperature protection a pplications ? s ub 5w led lighting applications orderin g information p ackage t emperature r ange ordering part number t ransport m edia m arking so p - 7 pb free - 40 to 85 pt 4225 e sog 25 00/ tape and reel pt 4225 xxxxx x n ote: typical application circuit xxxxxx assembly factory code lot number c 1 c 2 r 2 d 1 r 1 d 2 c 4 r 4 r 3 dc out r 5 ac in cs drain gnd vcc p t 4 2 2 5 fb nc t 1 c 3 r 6 d 3 drain 1 2 3 4 7 5 6
1 - 5w primary side cc regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 2 pt4225_ds rev en1.1 pt 4225 pin assignment pin descriptions pin no. sop7 pin n ames des cription 7 nc not connected 4 cs primary side current sense input 3 vcc power supply, the device is supplied by an auxiliary winding. 2 fb feedback winding voltage sense input 1 gnd ground 5,6 drain i nternal power switch output, drive primary winding absolute maximum ratings (note1) sym parameter value unit v cc v cc pin voltage - 0.3~ 3 5 v v fb v cs fb cs pin input voltage - 0.3 ~ 5 v v drain drain pin voltage - 0.3~600 v topt operating junction temp. range - 40 to 150 tstg storage temp. range - 55 to 150 esd hbm 2 000 v r ja sop - 7 12 0 /w note 1 : ab solute maximum ratings indicate limits beyon d which damage to the device may occur. recommended o perating r ange indicate s conditions for which the device is functional, but do not guarantee specific performance limits. electrical characteristics state dc and ac electrical specifications under partic ular test conditions which guarantee specific performance limits. this assumes that the device is within the operating ra nge . specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of devic e performance. recommended operating range sym parameter value unit v cc v cc pin operating voltage 9 .5 ~26 v t a operating ambient temperature - 20~85 g n d n c v c c d r a i n c s p t 4 2 2 5 d r a i n f b 1 2 3 4 7 6 5 s o p 7
1 - 5w primary side cc regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 3 pt4225_ds rev en1.1 pt 4225 electrical characteristics (t a =25 , v cc =1 6 v unless specified otherwise ) symbol parameter test conditio n min typ max unit supply voltage (v cc ) i start start up current vcc =1 3 .0 v 1 10 a v vcc_on v cc turn on threshold v cc rising 1 3 .5 1 5 1 6 . 5 v v vcc _ off v cc minimum operating voltage v cc f alling 8.0 9.0 10.0 v v vcc _ clamp vcc clamp voltage icc=10ma 33 v v vcc _ ovp vcc over voltage protection threshold 26 2 7.5 29 v i vcc q vcc supply current n o switching 35 0 7 00 a feed back voltage sense pin ( fb ) v fbmax fb over voltage protection 2.4 2. 5 2. 6 v v fb min fb minimum voltage 0. 8 v i fb _open fb open loop current - 85 a current sense input pin (cs) vcs current limit threshold ifb=0 4 9 0 500 5 1 0 mv t leb current sense leading edge blanking time 25 0 n s driver output drain r ds(on) on state resistance v cc =16 v 8 15 i ds o ff state leak current v cc =0 , v ds = 60 0 v 1 a bv ds drain breakdown voltage v cc =0 i drain =250ua 6 0 0 v protection t sd thermal shut down threshold 150
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