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ZXLD1350

Zetex Semiconductors
Part Number ZXLD1350
Manufacturer Zetex Semiconductors
Description 350mA LED driver
Published Apr 26, 2007
Detailed Description ZXLD1350 350mA LED driver with internal switch Description The ZXLD1350 is a continuous mode inductive step-down convert...
Datasheet PDF File ZXLD1350 PDF File

ZXLD1350
ZXLD1350

Overview
ZXLD1350 350mA LED driver with internal switch Description The ZXLD1350 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 350mA.
Depending upon supply voltage and external components, this can provide up to 8 watts of output power.
The ZXLD1350 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.
Depending upon the control frequency, this will provide either a continuous or a gated output current.
The PWM filter components are contained within the chip.
The PWM filter provides a soft-start feature by controlling the rise of input/output current.
The soft-start time can be increased using an external capacitor from the ADJ pin to ground.
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 www.
DataSheet4U.
com Applications • • • • • Low voltage halogen replacement LEDs Automotive lighting Low voltage industrial lighting LED back-up lighting Illuminated signs • • • • • • • • • • • • • Simple low parts count Internal 30V NDMOS switch 350mA output current Single pin on/off and brightness control using DC voltage or PWM Internal PWM filter 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 (*) Using standard external components as specified under ...


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