ZXLD1352 Datasheet | Zetex Semiconductors

.Data Sheet.co.kr A Product Line of Diodes Incorporated 350m A LED driver with internal switch and enhanced PWM dimming range Description The ZXLD1352 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 7V and 30V and provides an externally adjustable output current of up to 350m A. Depending upon supply voltage and external ponents, this can provide up to 8 watts of output power. The ZXLD1352 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted above, or below the set value, by applying an external control signal to the 'ADJ' pin. The ADJ pin will accept either a DC voltage or a PWM waveform. DC voltages between 0.3V and 2.5V allow adjustment of output current from 25% to 200% of nominal. 1000:1 adjustment of output current is possible using PWM control. Applying a voltage of 0.2V or lower to the ADJ pin turns the output off and switches the device into a low current standby state. The device is assembled in a TSOT23-5 pin package. Features - - - - - - - - - - - - - Simple low parts count Internal 30V NDMOS switch 350m A output current Single pin on/off and brightness control using DC voltage or PWM 1000:1 PWM dimming range Soft-start High efficiency (up to 95%(- )) Wide input voltage range: 7V to 30V 40V transient capability Output shutdown Up to 1MHz switching frequency Inherent open-circuit LED protection Typical 4% output current accuracy Applications - - - - - Low voltage halogen replacement LEDs Automotive lighting Low voltage industrial lighting LED back-up lighting Illuminated signs (- ) Using standard external ponents as specified under electrical characteristics. Efficiency is dependent upon the number of LEDs driven and on external...