AX2020 Datasheet Text
AX2020 32V,1A Step-down High Brightness LED Driver with 5000:1 Dimming
GENERAL DESCRIPTION The AX2020 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple series connected LED efficiently from a voltage source higher than the total LED chain voltage. The device operates from an input supply between 8V and 32V and provides an externally adjustable output current of up to 1A. Depending upon the supply voltage and external ponents, the AX2020 can provide more than 15 watts of output power. The AX2020 includes the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current, and a dedicated DIM input accepts a wide range of pulsed dimming. Applying a voltage of 0.3V or lower to the DIM pin turns the output off and switches the device into a low current standby state. The AX2020 is available in SOT89-5L package. Features
Simple low parts count Wide input voltage range: 8V to 32V Up to 1A output current VÛmw`R- yÑb€ Single pin on/off and brightness control using PWM Up to 1MHz switching frequency Typical 5% output current accuracy w.goftechm Sense High-Side Current Hysteretic Control: No pensation Adjustable Constant LED Current
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AX2020
BLOCK DIAGRAM
VIN V25
CSN
CS
- PARATOR + 130mV 2.5V 70µ + GATE DRIVER Driver
SW
UVLO PARATOR GND DIM BUFFER
DIM
PIN ASSIGNMENT The package of AX2020 is SOT89-5L; the pin assignment is given by: Name Description (Top View) Switch Output. SW is the output of VIN CSN SW the internal driver switch. 5 4 GND Signal and power ground. Connect GND directly to ground plane. Logic level dimming input. Drive AX2020 DIM...