NJW4617 Constant Current LED Driver with PWM Control GENERAL DESCRIPTION PACKAGE OUTLINE The NJW4617 is a constant current LED Driver with PWM control. 45V 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. NJW4617DL3 (TO-252-5) FEATURES Operating Voltage Range 2.5V to 40V Recommended LED Drive Voltage VLED=40V(max.) LED Output Current ILED=500mA(max.) Output Current Accuracy ±2.0% To 11 of White LED can be operated. (at LED Vf=3.4V) Current Consumption 450µA typ. With PWM Luminance Control and ON/OFF Control Internal Over Current Protection Circuit Internal Thermal Shutdown Circuit Package TO-252-5 BLOCK DIAGRAM VDD LED VREF ( 0.2V ) RS Current Limit TSD LED OVP Control Logic Standby Timer GND EN/PWM PIN CONFIGRATION 1: 2: 3: 4: 5: 1 2 3 4 VDD EN/PWM GND RS LED 5 * Please note that this device is still under the development and therefore the specifications are subject to change. Ver.2013-09-24 -1- NJW4617 ABSOLUTE MAXIMUM RATINGS PARAMETERS SYMBOL VDD Power Supply VDD Output voltage VLED EN/PWM Pin Voltage VENPWM Power Consumption Junction Temperature Operating Temperature Storage Temperature PD RATINGS -0.3 to +45 -0.3 to +45 -0.3 to +45 1190 (*1) 3125 (*2) -40 to +150 -40 to +105 -40 to +150 (Ta=25°C) UNIT V V V mW °C °C °C (*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers) (*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers), Internal Cu area: 74.2×74.2mm Tj Topr Tstg RECOMMENDED OPERATING CONDITIONS PARAMETERS SYMBOL CONDITIONS Operating Voltage VDD Output Current ILED Output Voltage VLED MIN 2.5 20 - TYP - (Ta=25°C) MAX Unit 40 V 500 mA 40 V ELECTRICAL CHARACTERISTICS (Unless otherwise noted, VDD=12V, VLED=1.0V, RS=2Ω, VENPWM=VDD, Ta=25°C) PARAMETERS SYMBOL CONDITIONS MIN TYP MAX Unit Quiescent Current IDD 340 550 µA Quiescent Current at OFF State IDD_OFF VENPWM=GND 0.1 µA -2 +2 % Output Current Accuracy ∆ILED Output Pin Leak Current ILEAK VENPWM=GND, VDD=40V, VLED =40V 0.1 µA OFF Delay Time tD_OFF 10 25 50 ms V 0.7VDD EN/PWM Pin ON Voltage1 VENPWM_ON1 VDD<5V, ILED=OFF→ON VDD 3.5 VDD EN/PWM Pin ON Voltage2 VENPWM_ON2 VDD≥5V, ILED=OFF→ON V V 0 0.5 EN/PWM Pin OFF Voltage VENPWM_OFF ILED=ON→OFF EN/PWM Pin Input Current IENPWM 7 µA RS Pin Leak Current IOUT_RS LED=OPEN 4 µA VENPWM=L→H, ILED=OFF→ON, PWM Pin ON Delay Time tPWM_ON 10 µs RS=0.4Ω VENPWM=H→L, ILED=ON→OFF, PWM Pin OFF Delay Time tPWM_OFF 1.2 µs RS=0.4Ω RS = 0Ω, LED Short Protection 22 V VLED_SHORT Detect Voltage ILED =ILED MAX→ ILED MAX × 0.5 Maximum Output Current ILED_MAX RS =0Ω 550 980 mA * Please note that this device is still under the development and therefore the specifications are subject to change. -2- Ver.2013-09-24 NJW4617 TYPICAL APPLICATION VDD /VLED VDD LED VREF ( 0.2V ) Current Limit TSD LED OVP RS Control Logic Standby Timer GND EN/PWM The Rs Resistance Setting formula: RS ( Ω ) = 0.2(V ) ILED ( A) * Please note that this device is still under the development and therefore the specifications are subject to change. Ver.2013-09-24 -3- NJW4617 MEMO [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. -4- Ver.2013-09-24