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MIC4043 - Low-Voltage Secondary-Side Shunt Regulator

Description

The MIC4043 is a shunt regulator optimized for secondaryside regulation in low-voltage power supplies.

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Datasheet Details

Part number MIC4043
Manufacturer Micrel Semiconductor
File Size 1.62 MB
Description Low-Voltage Secondary-Side Shunt Regulator
Datasheet download datasheet MIC4043 Datasheet
Additional preview pages of the MIC4043 datasheet.

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Full PDF Text Transcription

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MIC4043 Low-Voltage, Secondary-Side Shunt Regulator General Description The MIC4043 is a shunt regulator optimized for secondaryside 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 opto-isolators 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 opto-isolator’s LED (secondary side); the opto-isolator’s transistor (primary side) provides this signal to the controller’s feedback input.
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