Microchip MIC4043BM4 TR

Преобразователи, источники питания10V10V

Overview

The MIC4043BM4 TR 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 MIC4043BM4 TR 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 MIC4043BM4 TR normally drives the LED of an optically isolated feedback circuit. The MIC4043BM4 TR 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 MIC4043BM4 TR is also practical for other voltage-monitoring applications requiring an opencollector output.The MIC4043BM4 TR 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.

Features