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Diodes Incorporated

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Product Description:
The ZXLD1356 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 6V and 60V and provides an externally adjustable output current of up to 550mA. Depending upon supply voltage and external components, this can provide up to 30 watts of output power. The ZXLD1356 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 (dimmed) or a gated output current. Soft-start can be forced 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.

Product Specifications:
Typically better than 0.8% output current accuracy
Available in thermally enhanced DFN package
Simple and with low part count
Single pin on/off and brightness control using DC voltage or PWM
PWM resolution up to 1000:1
High efficiency (up to 97%)
Wide input voltage range: 6V to 60V
Inherent open-circuit LED protection

Product Overview Specs
Part Number ZXLD1356
Min.- Max. Input Voltage (V) 6 ~ 60
Output Voltage (V) 60
Typ Peak Output Current (A) 0.55
Max Output Current (mA) -
LED Current Accuracy (%) 3
Frequency (kHz) typ 1000
Efficiency (%) 97
Operating Temperature (C) -40 to +125
Quiescent Current (mA) typ -
Standby Quiescent Current (uA) typ 65

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