LT4430

PRODUCTION

Secondary-Side Optocoupler Driver

Data Sheet Product Selection Table
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Overview

  • 600mV Reference (1.25% Over Temperature)
  • Wide Input Supply Range: 3V to 20V
  • Overshoot Control Function Prevents Output Overshoot on Start-Up and Short-Circuit Recovery
  • High Bandwidth Error Amplifier Permits Simple Loop Frequency Compensation
  • Ground-Referenced Opto-Coupler Drive
  • 10mA Opto-Coupler Drive with Current Limiting
  • Low Profile (1mm) ThinSOT™ Package

The LT4430 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% 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.

Applications

  • 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
LT4430
Secondary-Side Optocoupler Driver
Simplified Isolated Synchronous Forward Converter Isolated Flyback Telecom Converter Start-Up with Overshoot Control (See Schematic on Back Page) Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Technical Articles 3

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 2
LTM8047
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter
LTM8048
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT4430
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC968A-B

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A

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Product Details

DC968A-B Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

eval board
schematic 2
DC968A-C

OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A

Buy Now View Details

Product Details

This evaluation board is obsolete and no longer recommended. The replacement board is the DC1317A-C.

DC968A-C Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

eval board
schematic 3
DC968A-A

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A

Buy Now View Details

Product Details

DC968A-A Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver


 


eval board
schematic 4
DC968A-D

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A

Buy Now View Details

Product Details

DC968A-D Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver
DC968A-B
LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A
DC968A-B - Schematic
DC968A-C
OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A
DC968A-C - Schematic
DC968A-A
LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A
DC968A-A - Schematic
DC968A-D
LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A
DC968A-D - Schematic

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