Secondary-Side Optocoupler Driver

Posted on Feb 5, 2014

The LT ®4430 drives the opto-coupler that crosses the galvanic barrier in an isolated power supply. The IC contains a precision-trimmed reference, a high bandwidth error amplifier, an inverting gain of 6 stage to drive the optocoupler and unique overshoot control circuitry. The LT4430`s 600mV reference provides ±0. 75% initial accuracy and ±1. 25%

Secondary-Side Optocoupler Driver
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tolerance over temperature. A high bandwidth 9MHz error amplifier permits simple frequency compensation and negligible phase shift at typical loop crossover frequencies. The opto-coupler driver provides 10mA of output current and is short-circuit protected. A unique overshoot control function prevents output overshoot on start-up and short-circuit recovery with a single capacitor.

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