NJW4615 - 1 - ver.2010-12-27 NJW4615 123 654 constant current led driver with pwm control general description ? package outline features operating voltage range 2.5v to 5.5v led drive voltage v led = 35v(max.) led output current 100ma(max.) current consumption 200 a output current accuracy 1.2% to 8 of white led can be operated. with pwm luminance control internal overcurrent protection circuit internal thermal shutdown circuit package sot-23-6 ? block diagram ? pin configration 1 : pwm 2 : gnd 3 : r s 4 : led 5 : en 6 : v dd NJW4615f1 the NJW4615 is a constant current led with pwm control. 35v resisting constant current control and pwm control circuit can be offered with small package. it can achieve luminance control multiple white or blue and red leds.it can contribute to the reli ability improvement of the system because it has an overcurrent protection and thermal shutdown circuit. the NJW4615 is suit for an amusement, home audio,etc. vref (0.2v) current limit thermal shut down control logic v dd led r s pw m en gnd
NJW4615 - 2 - ver.2010-12-27 ababsolute maximum ratings (ta=25 c) parameters symbol ratings unit vdd power supply v dd -0.3 to +6.0 v output voltage v led -0.3 to +40 v output current i led 100 ma pwm terminals voltage v pwm +6.0 (*1) v en terminals voltage v en +6.0 (*1) v power consumption p d 510 (*2) mw junction temperature tj -40 to +150 c operating temperature topr -40 to +85 c storage temperature tstg -40 to +150 c (*1): when input voltage is less than +6v, the absolute ma ximum control voltage is equal to the input voltage. (*2): mounted on glass epoxy board based on eia/jedec. (76.2 x 114.3 x 1.6mm : 2layers) recommended operating conditions (ta=25 c) parameters symbol conditions min typ max unit operating voltage v dd 2.5 - 5.5 v output voltage v led - - 35 v ? electrical characteristics (unless otherwise noted, v dd =3.0v, v led =1.0v, r s =10 ? , v en =v pwm =v dd , ta=25 c ) parameters symbol conditions min typ max unit operating current i dd - 200 320 a operating current at off state i dd_off v en =gnd - - 0.1 a output current accuracy ? i led -1.2 - +1.2 % output terminal leak current i leak1 v en =gnd, v dd =5.5v, v led =35v - - 0.1 a output terminal leak current 2 i leak2 v pwm =gnd v dd =5.5v, v led =35v - - 0.1 a en terminal on voltage v en_on i led =off on 1.6 - v dd v en terminal off voltage v en_off i led =on off 0 - 0.3 v pwm terminal on voltage v pwm_on i led =off on 0.7v dd - v dd v pwm terminal off voltage v pwm_off i led =on off 0 - 0.3v dd v en terminal input current i en - - 0.1 a pwm terminal input current i pwm - - 0.1 a rs terminal leak current i leak_rs v en =gnd, v rs = v led =3v - - 0.1 a pwm terminal on delay time t pwm_on v pwm =l h - 3 - s pwm terminal off delay time t pwm_off v pwm =h l - 1 - s maximum output current i led_max r s =0 ? 100 170 - ma
NJW4615 - 3 - ver.2010-12-27 typical application v ref (0.2v) 0 i led v dd r s :current sense resistance current limit thermalshutdown control lo g ic v led led rs pwm en gnd v dd led output current wave form at pwm control pwm control signal i led the rs resistance setting formula : led s i v r ) ( 2 . 0 = [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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