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A8431 - White LED Driver Constant Current Step-up Converter

Description

Pb-Free, Surface Mount 26185.301 Preliminary Data Sheet Subject to Change Without Notice April 5, 2005 White LED Driver Constant Current Step-up Converter Functional Block Diagram FB SW A8431 VIN VREF 1.25 V 95 mV A1 RC CC A2 R S Q Driver Σ OVP Ramp Generator OVP 1.2 MHz Oscillator EN Ena

Features

  • Output voltage up to 32 V (OVP level) 2.5 V to 10 V input Drives up to 4 LEDs at 20 mA from a 2.5 V supply Drives up to 5 LEDs at 20 mA from a 3 V supply 1.2 MHz switching frequency 300 mA switch current limit 1 µA shutdown current OVP pin eliminates the need for an external Zener diode on the output.

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Datasheet Details

Part number A8431
Manufacturer Allegro MicroSystems
File Size 354.11 KB
Description White LED Driver Constant Current Step-up Converter
Datasheet download datasheet A8431 Datasheet

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Full PDF Text Transcription

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www.DataSheet4U.com Preliminary Data Sheet Subject to Change without Notice April 5, 2005 A8431 The A8431 is a noninverting boost dc-dc converter that provides a programmable constant current output up to 32 V for driving white LEDs in series.The A8431 also offers an OVP (overvoltage protection) pin. Driving the LEDs in series ensures identical currents and uniform brightness. Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source. Up to two parallel strings of eight white LEDs can be driven at 20 mA by increasing the supply voltage up to 10 V. The A8431 incorporates a power switch and a feedback sense amplifier to provide a solution with minimum external components.
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