6~30V/1.5A,Step-down High Brightness LED Driver with 5000:1 Dimming
GENERAL DESCRIPTION The JWD4215 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple series connected LED efficiently from a voltage source higher than the total LED chain voltage. The device operates from an input supply between 8V and 30V and provides an externally adjustable output current of up to 1.2A. Depending upon the supply voltage and external components, the JWD4215 can provide more than 30 watts of output power. The JWD4215 includes the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current, and a dedicated DIM input accepts either a DC voltage or a wide range of pulsed dimming. Applying a voltage of 0.3V or lower to the DIM pin turns the output off and switches the device into a low current standby state. The JWD4215 is available in SOT89-5 packages.
FEATURES Simple low parts count Wide input voltage range: 8V to 30V Up to 1.2A output current Single pin on/off and brightness control using DC voltage or PWM Up to 1MHz switching frequency Typical 5% output current accuracy Inherent open-circuit LED protection High efficiency (up to 97%) High-Side Current Sense Hysteretic Control: No Compensatio Adjustable Constant LED Current
APPLICATION Low voltage halogen replacement LEDs Automotive lighting Low voltage industrial lighting LED back-up lighting Illuminated signs SELV lighting LCD TV backlighting