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LTC3803-5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3803-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 26 page LT4430 1 4430fb • • + • • VIN 4430 TA01 + VOUT VCC VCC VIN OPTO GND COMP OC FB LTC3900 SYNC CG FG LT4430 ISOLATION BARRIER LT1952 n 48V Input Isolated DC/DC Converters n Isolated Telecommunication Power Systems n Distributed Power Step-Down Converters n Offline Isolated Power Supplies n Industrial Control Systems n Automotive and Heavy Equipment FEATURES DESCRIPTION TYPICAL APPLICATION APPLICATIONS Secondary-Side Opto-Coupler Driver The LT®4430 drives the opto-coupler that crosses the gal- vanic 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 opto- coupler 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 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. The LT4430 is available in the low profile 6-lead TSOT-23 package. n 600mV Reference (1.25% Over Temperature) n Wide Input Supply Range: 3V to 20V n Overshoot Control Function Prevents Output Overshoot on Start-Up and Short-Circuit Recovery n High Bandwidth Error Amplifier Permits Simple Loop Frequency Compensation n Ground-Referenced Opto-Coupler Drive n 10mA Opto-Coupler Drive with Current Limiting n Low Profile (1mm) ThinSOTTM Package Simplified Isolated Synchronous Forward Converter Isolated Flyback Telecom Converter Start-Up with Overshoot Control (See Schematic on Back Page) VIN 50V/DIV VOUT 5V/DIV OVERSHOOT CONTROL IMPLEMENTED t = 5ms/DIV 4430 TA01b L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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