LT4430 Datasheet | Linear Technology

LT4430 Secondary-Side Optocoupler Driver .. - - - Features 600m V Reference (1.25% Over Temperature) Wide Input Supply Range: 3V to 20V Overshoot Control Function Prevents Output Overshoot on Startup and Short-Circuit Recovery High Bandwidth Error Amplifier Permits Simple Loop Frequency pensation Ground-Referenced Opto Coupler Drive 10m A Opto Coupler Drive with Current Limiting Low Profile (1mm) Thin SOTTM Package DESCRIPTIO - The LT®4430 drives the optocoupler 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 600m V reference provides ±0.75% initial accuracy and ±1.25% tolerance over temperature. A high bandwidth 9MHz error amplifier permits simple frequency pensation and negligible phase shift at typical loop crossover frequencies. The optocoupler driver provides 10m A of output current and is short-circuit protected. A unique overshoot control function prevents output overshoot on startup and short-circuit recovery with a single capacitor. The LT4430 is available in the low profile 6-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. - - - U APPLICATIO S - - - - - - 48V Input Isolated DC/DC Converters Isolated Telemunication Power Systems Distributed Power Step-Down Converters Offline Isolated Power Supplies Industrial Control Systems Automotive and Heavy Equipment TYPICAL APPLICATIO ISOLATION BARRIER VIN Simplified Isolated Synchronous Forward Converter Isolated Flyback Tele Converter Startup with Overshoot Control (See Schematic on Page 20) VIN 50V/DIV LT1952 FG CG SYNC LTC3900 VCC + - - + VOUT - - VIN GND OC LT4430 OPTO P FB VOUT 5V/DIV OVERSHOOT CONTROL IMPLEMENTED t = 5ms/DIV 4430 TA01b 4430 TA01 4430f LT4430...