primary side offline led controller with active pfc china resources powtech (shanghai) co. ltd ww w.crpowtech.com page 1 PT4219_ds rev en1.0 pt 4219 general description t h e pt 42 1 9 is a primary side constant current controlle r which can achieve high power factor in a single stage converter, targeted to applications in solid state lighting . i t is designed for the flyback topology, and regulates output cu rrent accurately without the secondary feedback loop. pt 42 1 9 works in quasi - resonant mode to reduce the mosfet switching loss . the device use s extremely low start up and low quiescent current to achieve high efficiency . a c omplete set of integrated protect ion functions allows the pt 42 1 9 to protect against all fault conditions such as vcc under - voltage, vcc over - voltage, cycle by cycle current limit, output open/short circuit, rcs open cir cuit , transformer winding short circuit and over temperature shut down . the pt 42 1 9 is available in sop8 package. f eatures ? c onstant current control w ithout s econdary f eed back ? accurate constant current output ? quasi - resonant mode operation ? ultra - low 10ua start up current ? low quiescent current (1ma) ? vcc under voltage protection ? over voltage protection by voltage holding ? cycle by cycle current limit ? rcs open circuit protection ? transformer winding short circuit protection ? output open/ short circ uit protection ? over temperature protection a pplications ? solid state lighting ? industrial and commercial lighting ? residential lightin g ordering information p ackage t emperature r ange ordering part number t ransport m edia m arking sop - 8 - 40 to 85 pt 42 1 9esoh 3000/ tape and reel pt42 1 9 xxxx x x typical application circuit c 2 r 2 d 2 c 3 v c c d r v g n d d 3 c 4 r 4 r 3 d e t p t 4 2 1 9 r 6 c o m p c s a c 8 5 ~ 2 6 4 v r s t r c s r 1 1 r 1 2 v i n s n c c 1 d 1
primary side offline led controller with active pfc china resources powtech (shanghai) co. ltd ww w.crpowtech.com page 2 PT4219_ds rev en1.0 pt 4219 pin assignment pin descriptions pin no. pin n ames description 1 vins one of the input pin of the internal multiplier. 2 det a uxiliary w inding v oltage s ense pin to detect the moment of z ero current of secondary winding, and over voltage . 3 v cc power supply pin for all internal circuit. 4 drv ex ternal mosfet gate driver pin 5 cs primary winding current sensing pin 6 gnd ground 7 nc not connected 8 comp c ompensation pin for constant current control loop absolute maximum ratings (note1) sym parameter value unit v cc v cc dc supply voltage 30 v v v cc_ clamp v cc clamp voltage 3 1 v i v cc _ clamp v cc dc clamp current 10 ma i det_max max det pin current - 50 - 10 ma i drv_max max drv pin current 1.2 a v drv drv pin voltage range - 0.3~ 3 1 v v cs cs pin voltage range - 0.3~ 3 1 v v i/o other i/o pin input voltage - 0.3~7 v t opt operating temp. range - 40 to 1 2 5 t stg storage temp. range - 55 to 150 r ja so p8 184 /w hbm esd capability, hbm note2 2 000 v p t 4 2 1 9 1 2 3 8 7 6 comp nc vins cs drv gnd sop - 8 4 5 det vcc
|
