A8431 - White LED Driver Constant Current Step-up Converter

Allegro MicroSystems

A8431 Datasheet Preview — Preview of A8431 PDF

Datasheet Details

Part number	A8431
Manufacturer	Allegro MicroSystems
File Size	354.11 KB
Description	White LED Driver Constant Current Step-up Converter
Datasheet	A8431_AllegroMicroSystems.pdf

A8431 Product details

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 Enable GND ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V (unless otherwise noted) Characteristics Input Voltage Range Supply Current Feedback Reference Voltage Feedback Input Current Switch Curren

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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Published: Mar 14, 2007 |