詳細(xì)信息
AX2020 32V,1A Step-down High BrightnessLED Driver with 5000:1 Dimming
性能描述：
The AX2020 is a continuous conduction mode inductive step-down converter, designedfor driving single or multiple series connected LED efficiently from a voltage source higherthan the total LED chain voltage. The device operates from an input supply between 8V and32V and provides an externally adjustable output current of up to 1A. Depending upon thesupply voltage and external components, the AX2020 can provide more than 15 watts ofoutput 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 ower 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.
特點(diǎn)：
·Simple low parts count
·Wide input voltage range: 8V to 32V
·Up to 1A output current
·Single pin on/off and brightness control using PWM
·Up to 1MHz switching frequency
·Typical 5% output current accuracy
·High-Side Current Sense
·Hysteretic Control: No Compensation
·Adjustable Constant LED Current
典型應(yīng)用電路圖：
引腳圖：
The package of AX2020 is SOT89-5L; the pin assignment is given by: