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LT4430ES6 Datasheet(PDF) 1 Page - Linear Technology |
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LT4430ES6 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LT4430 1 4430f FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Secondary-Side Optocoupler Driver The LT®4430 drives the optocoupler that crosses the galvanic barrier in an isolated power supply. The IC con- tains 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% tolerance over temperature. A high bandwidth 9MHz error amplifier permits simple frequency compensation and negligible phase shift at typical loop crossover frequencies. The optocoupler driver provides 10mA 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. ■ 48V Input Isolated DC/DC Converters ■ Isolated Telecommunication Power Systems ■ Distributed Power Step-Down Converters ■ Offline Isolated Power Supplies ■ Industrial Control Systems ■ Automotive and Heavy Equipment ■ 600mV 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 Compensation ■ Ground-Referenced OptoCoupler Drive ■ 10mA OptoCoupler Drive with Current Limiting ■ Low Profile (1mm) ThinSOTTM Package Simplified Isolated Synchronous Forward Converter , LTC and LT are registered trademarks of Linear Technology Corporation. • • + • • VIN 4430 TA01 + VOUT VCC VCC VIN OPTO GND COMP OC FB LTC3900 SYNC CG FG LT4430 ISOLATION BARRIER LT1952 Isolated Flyback Telecom Converter Startup with Overshoot Control (See Schematic on Page 20) VIN 50V/DIV VOUT 5V/DIV OVERSHOOT CONTROL IMPLEMENTED t = 5ms/DIV 4430 TA01b ThinSOT is a trademark of Linear Technology Corporation. |
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