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.
A8431 Datasheet
