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发布者:微桥AX2201 发布时间:2010-12-31 阅读:4707次    关键字: AXELITE 亚瑟莱特 LED 微桥 AX2201
AX2201-PWM Step-Down Controller for LED Driver


AX2201-PWM Step-Down Controller for LED Driver PDF文档下载 

GENERAL DESCRIPTION
    The AX2201 integrates Pulse-Width-Modulation (PWM) control circuit into a single
chip. These devise include a reference voltage source, oscillation circuit, error amplifier and etc.
    AX2201 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an internal compensation block is built in to minimum external component count.
    With the addition of an external P-channel Power MOS, a coil, capacitors, and a
diode connected externally, these components can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L and MSOP-8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 24V, it is also suitable for the operation via an AC adapter.

FEATURES
- Input voltage:3.6V to 23V
- Output voltage:0.25V to VCC
- LED backlight and high Power LED application
- Duty ratio:0% to 100% PWM control
- Oscillation frequency:330KHz.
- Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- External SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- MSOP-8L and SOP-8L Pb-Free packages.

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