ec421 3 constant current n - channel mosfet linear led controller e - cmos corp. (ww w .e c mo s . c om.tw) 4h22 n rev. f00 2 1 / 5 fe a tures ? universal input voltage range of 120va c 16% or 230vac 16% ? constant led current controller ? adjusted constant current operation ? low quiescent current ? simplifies circuit and system designs ? pwm dimming control ? external n - channel mosfet for high current application ? temperature compensated constant current ? programmable over temperature protection ? programmable over current protection ? programmable led short protection ? sop10 package appl i c a tions ? high power led driver ? lighting applications ? t5 or t8 tube ? low cost solution ? co nstant current s ink general description the EC4213 is a constant n - channel mosfet current linear led controller for replace discrete solutions in ac /dc power application (up to 270 v ac ). t he controller can drive a n output power of 10 % variation from a universal input voltage range of 120va c 16%, or 230vac 16% for different led strings. the solution eliminates the need of individual components by combining them into a single package, which results in a significant reduction of both system cost and board space. the controller is capable of a dimming input for adjustable led brightness control by pulse width modulation (pwm) . the EC4213 can protect the external n - channel mosfet against over temperature and over current . internal thermal foldba ck function regulates led driv ing current automatically for temperature management of the leds or the n - channel mosfet during high power operation or high ambient temperature conditions by a n external ntc resistor . the se features provide maximum system protection for the demanding lighting applications. the EC4213 is available in a s pace saving sop10 package , an d th e operating temperature is from C 4 0 c to + 12 5c. typical application circuit fig. 1 simplified application circuit q 1 br 1 r e xt v led r 1 r 2 i led 1 2 3 4 10 9 8 7 5 6 v in r ext v cs gnd v ff d im ntc led s v s v o r 5 r ntc r 3 r cs r 4
ec421 3 constant current n - channel mosfet linear led controller e - cmos corp. (ww w .e c mo s . c om.tw) 4h22 n rev. f00 2 2 / 5 abs olute m ax i mum r a tings v in supply voltage ..................................... ........ . . . .. . 5 5 0 v v ff , d im , v s , ntc , led s , r ext , v cs , v o operation voltage . .. . .................................................................... 6 v operati n g t e mpera ture - 4 0 c to +12 5 c storage t e mperature - 5 5c to +150 c maximum d i e t e mperature . +150c le a d t e mperature. + 260 c esd hbm voltage hv pin .... . 1 . 2 kv esd hbm voltage l v pin .... . . 3 .5 kv esd m m voltage . . 3 5 0 v pin configuration note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rat ing level may affect device reliability. electr i cal characterist i cs t a = 25 c u nless o the r w ise specif i ed parameter conditions min typ max unit electrical characteristic v in operation voltage 2 5 500 v i led current regulation (note 1) v in = 25 vdc, r ext = 6 95 100 105 ma v in = 2 5 vdc, r ext = 2 285 30 0 31 5 ma i q quiescent c urrent (note 2 ) v in =20vdc, r ext = open 3 0 0 a v ref reference voltage 0.6 v v s external reference voltage 1.2 1 v v dim - h d im pin high threshold v dim rising 1.4 v v dim - l d im pin low threshold v dim falling 0.4 v thermal characteristic v ref (t) v ref temperature coefficient t a = - 40 c ~1 25 c 0.01 / t a operating temperature - 40 125 p d total power dissipation (operation) 1 w r ja thermal resistance sop10 package 14 0 /w protection leds led short protection 0.6 4 v otp ntc 0. 3 v tfp ntc the rmal foldback protection 0. 5 v note: 1. i led =0.6/r ext , v ff = 0v, d im = 0v , led s = 0v , ntc pin is connected to v s pin. 2 . v ff = 0v, d im = 0v , led s = 0v , ntc pin is connected to v s pin. 1 2 3 so p 10 4 10 9 8 7 5 6 r ext v o v cs gnd v in d im ntc v ff led s v s
e - cmos corp. (ww w .e c mo s . c om.tw) 4h22 n rev. f00 2 ec 42 1 3 con stant current n - channel mosfet linear led controller 3 / 5 function diagram pin descriptions o rdering information part no. package type marking information remark ec4 21 3 nnm 1 r s op - 10l ec421 3 lllll yywwt 1. lllll lot no 2. yyww date code 3. t internal tracking code pin symbol description 1 v in i nput supply voltage . 2 gnd all external components are connected to ground pin with shortest loops feasible. 3 v ff input voltage sensing through a voltage di vider for constant output power regulation. 4 d im connect a logic level pwm signal for adjustable brightness of led strings. 5 v s external voltage reference for thermal foldback circuit. 6 ntc connect a divider of a resistor and thermistor from v s to mo nitor the temperature of the leds or the n - channel mosfet . 7 led s led short protection . 8 r ext an external resistor between r ext and gnd pin sets different current regulation for led strings. 9 v cs a resistor is connected between v cs and r ext pin for ov er current protection . 10 v o connect to gate of n - channel mosfet. fig. 2 detailed block diagram v in gnd r ext v o regulator v cc v ff v s voltage reference ntc thermal regulation d im v cs control circuits led s
e - cmos corp. (ww w .e c mo s . c om.tw) 4h22 n rev. f00 2 ec 42 1 3 con stant current n - channel mosfet linear led controller 4 / 5 led lighting EC4213 application circuit schematic 22 0 vac 5 0 w led lighting demo board part list component value package u1 ec 421 3 sop10 f1 1a dip br1 b 1 0 s smd q1 4 a to220 rv1 431kd14 (275vac) dip r 1 5.11 meg 0603 r 2 14.7 k 0603 r 3 7.5 k 0603 r 4 5.11 meg 0603 r 5 1 8 k 0603 r cs 0. 1 5 0805 r ext 1.3 dip r ntc 100k dip v led 240 v na fig. 3 typical application circuit u1 q 1 br 1 r e xt v led r 1 r 2 i led 1 2 3 4 10 9 8 7 5 6 v in r ext v cs gnd v ff d im ntc led s v s v o r 5 r ntc r 3 r cs r 4 ac f 1 rv 1
e - cmos corp. (ww w .e c mo s . c om.tw) 4h22 n rev. f00 2 ec 42 1 3 con stant current n - channel mosfet linear led controller 5 / 5 outline dimensions (dimensions shown in millimeters)
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