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AX2012-1.9A Fixed Frequency White LED Driver PDF文档下载

GENERAL DESCRIPTION
    The AX2012 is a step-up converter designed for driving up to 8 series white LEDs for backlighting application. The AX2012 uses current mode, 1.2MHZ fixed frequency
architecture to regulate the LED current, which is set through an external current sense resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The AX2012 includes under-voltage lockout, current limiting and thermal shutdown protection preventing damage in the event of an output overload. The driver is available in small 6-pin TSOT23 and 8-pin TDFN (2mm x 2mm) packages.
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FEATURES
- 2.5V to 5.5 V operating input voltage range
- Drives up to 8 series White LEDs
- 1.2MHz Fixed Switching Frequency
- Wide range for PWM dimming (200Hz to 200KHz)
- Internal 1.9A switching current limit
- Over Voltage Protection (OVP)
- Internal Soft-start Function
- Current limit and Thermal shutdown protection
- Under voltage Lockout
- Available in the 6-pin TSOT23 and 8-pin TDFN Packages