
The MIC4043 is a shunt regulator optimized for secondary-side regulation in low-voltage power supplies. Featuring an output stage guaranteed to swing within 400mV of ground, the MIC4043 can be used in power supplies operating down to 1.8V, even with optoisolators requiring greater than 1.2V of headroom.In power supply applications, the MIC4043 normally drives the LED of an optically isolated feedback circuit. The MIC4043 monitors a resistively-divided output voltage and sinks error current through the optoisolator’s LED (secondary side); the optoisolator’s transistor (primary side) provides this signal to the controller’s feedback input. The MIC4043 is also practical for other voltage-monitoring applications requiring an opencollector output.The MIC4043 replaces conventional ’431-type shunt regulators to allow low-voltage applications where there is inadequate headroom for a 2.5V regulator in series with an optoisolator. Replacing ’431-type devices requires only a minor change to the way that the resistive-divider values are calculated.
Ideal for 1.8V switching converters
Low-voltage operation:
400mV maximum saturation over operating temperature range
Easy to use:
Voltage in, current out2% voltage tolerance over operating temperature range
MIC4043 封裝圖
MIC4043 封裝圖
型號(hào) | 制造商 | 描述 | 購(gòu)買(mǎi) |
---|---|---|---|
MIC4043YM4-TR | Vishay Sprague | 鉭電容 軸向 | 立即購(gòu)買(mǎi) |
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