LT4430 Secondary-Side Opto-Coupler Driver Fea T Descrip T n 600mV Reference (1.25% Over Temperature) The LT 4430 drives the opto-coupler that crosses the gal- n Wide Input Supply Range: 3V to 20V vanic barrier in an isolated power supply. The IC contains n Overshoot Control Function Prevents Output a precision-trimmed reference, a high bandwidth error Overshoot on Start-Up and Short-Circuit Recovery amplifier, an inverting gain of 6 stage to drive the opto- n High Bandwidth Error Amplifier Permits Simple Loop coupler and unique overshoot control circuitry. Frequency Compensation The LT4430s 600mV reference provides 0.75% initial n Ground-Referenced Opto-Coupler Drive accuracy and 1.25% tolerance over temperature. A high n 10mA Opto-Coupler Drive with Current Limiting bandwidth 9MHz error amplifier permits simple frequency TM n Low Profile (1mm) ThinSOT Package 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 T A unique overshoot control function prevents output n 48V Input Isolated DC/DC Converters overshoot on start-up and short-circuit recovery with a n Isolated Telecommunication Power Systems single capacitor. n Distributed Power Step-Down Converters The LT4430 is available in the low profile 6-lead TSOT-23 n Offline Isolated Power Supplies package. n Industrial Control Systems n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Automotive and Heavy Equipment Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Simplified Isolated Synchronous Forward Converter ISOLATION BARRIER Isolated Flyback Telecom Converter V V IN OUT Start-Up with Overshoot Control + + (See Schematic on Back Page) V IN 50V/DIV FG CG V LT1952 SYNC CC LTC3900 V OUT 5V/DIV OVERSHOOT CONTROL V CC V OPTO IMPLEMENTED IN LT4430 GND COMP 4430 TA01b t = 5ms/DIV OC FB 4430 TA01 4430fd 1 For more information www.linear.com/LT4430 ion pplica ions pplica ion uresLT4430 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW Supply Voltage V ........................................................................20V V 1 6 OPTO IN IN GND 2 5 COMP FB Voltage .................................................... 0.3V to 6V OC 3 4 FB OPTO Short-Circuit Duration ............................ Indefinite Operating Junction Temperature Range (Note 2) S6 PACKAGE 6-LEAD PLASTIC TSOT-23 E-, I-Grades ....................................... 40C to 125C T = 125C, = 250C/W JMAX JA H-Grade ............................................. 40C to 150C MP-Grade .......................................... 55C to 150C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4430ES6 PBF LT4430ES6 TRPBF LTBFY 6-Lead Plastic TSOT-23 40C to 125C LT4430IS6 PBF LT4430IS6 TRPBF LTBFY 6-Lead Plastic TSOT-23 40C to 125C LT4430HS6 PBF LT4430HS6 TRPBF LTBFY 6-Lead Plastic TSOT-23 40C to 150C LT4430MPS6 PBF LT4430MPS6 TRPBF LTBFY 6-Lead Plastic TSOT-23 55C to 150C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4430ES6 LT4430ES6 TR LTBFY 6-Lead Plastic TSOT-23 40C to 125C LT4430IS6 LT4430IS6 TR LTBFY 6-Lead Plastic TSOT-23 40C to 125C LT4430HS6 LT4430HS6 TR LTBFY 6-Lead Plastic TSOT-23 40C to 150C LT4430MPS6 LT4430MPS6 TR LTBFY 6-Lead Plastic TSOT-23 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: