NJW4615

NJW4615 Constant Current LED Driver with PWM Control GENERAL DESCRIPTION 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 reliability improvement of the system because it has an overcurrent protection and thermal shutdown circuit. The NJW4615 is suit for an amusement, home audio,etc. PACKAGE OUTLINE NJW4615F1 FEATURES Operating Voltage Range 2.5V to 5.5V LED Drive Voltage VLED= 35V(max.) LED Output Current 100mA(max.) Current consumption 200µA 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 V DD L ED V R EF (0.2V) C urrent Lim it T herm al Shut D own RS C ontrol Logic GND EN PW M PIN CONFIGRATION 6 5 4 NJW4615 1 2 3 1 2 3 4 5 6 : : : : : : PWM GND RS LED EN VDD Ver.2010-12-27 -1- NJW4615 ABABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETERS SYMBOL RATINGS UNIT VDD Power Supply VDD -0.3 to +6.0 V Output voltage VLED -0.3 to +40 V Output Current ILED 100 mA PWM Terminals Voltage VPWM +6.0 (*1) V EN Terminals Voltage VEN +6.0 (*1) V Power Consumption PD 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 maximum 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 PARAMETERS SYMBOL CONDITIONS Operating voltage VDD Output voltage VLED MIN 2.5 - TYP - (Ta=25°C) MAX Unit 5.5 V 35 V ELECTRICAL CHARACTERISTICS (Unless otherwise noted, VDD=3.0V, VLED=1.0V, RS=10Ω, VEN=VPWM=VDD, Ta=25°C) PARAMETERS SYMBOL CONDITIONS Operating Current IDD Operating Current at OFF state IDD_OFF VEN=GND Output Current Accuracy ∆ILED Output Terminal Leak Current ILEAK1 VEN=GND, VDD =5.5V, VLED =35V Output Terminal Leak Current 2 ILEAK2 VPWM=GND VDD =5.5V, VLED =35V EN Terminal ON Voltage VEN_ON ILED=OFF→ON EN Terminal OFF Voltage VEN_OFF ILED=ON→OFF PWM Terminal ON Voltage VPWM_ON ILED=OFF→ON PWM Terminal OFF Voltage VPWM_OFF ILED=ON→OFF EN Terminal Input Current IEN PWM Terminal Input Current IPWM RS Terminal Leak Current ILEAK_RS VEN=GND, VRS = VLED =3V PWM Terminal ON Delay Time tPWM_ON VPWM=L → H PWM Terminal OFF Delay Time tPWM_OFF VPWM=H → L Maximum Output Current ILED_MAX RS =0Ω MIN TYP 200 -1.2 1.6 0 0.7VDD 0 3 1 100 170 MAX 320 0.1 +1.2 0.1 0.1 VDD 0.3 VDD 0.3VDD 0.1 0.1 0.1 - Unit µA µA % µA µA V V V V µA µA µA µs µs mA -2- Ver.2010-12-27 NJW4615 TYPICAL APPLICATION VLED VDD Output current wave form at PWM control VDD LED I LED 0 LED I LED V REF (0.2V) Rs Current Limit ThermalShutDown Control Logic RS :Current sense resistance GND EN PWM PWM control signal The Rs Resistance Setting formula : RS = 0.2(V ) I LED [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. Ver.2010-12-27 -3-