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IS31LT3957A - HIGH VOLTAGE LED LIGHTING CONTROLLER

General Description

The IS31LT3957A is a current mode PWM controller designed to drive a low side external NMOS FET for wide input/output voltage range and high LED current applications.

An external resistor senses the high side output current of the LED string.

Key Features

  • Wide high voltage input range: 5V to 75V.
  • Supports boost, buck-boost, SEPIC and buck topology.
  • ±2% output current accuracy.
  • Adjustable operating frequency range of 100kHz~1MHz.
  • Programmable soft start to avoid inrush current.
  • Fixed under voltage lockout threshold.
  • EMI reduction capabilities - Programmable spread spectrum function - Operating frequency synchronization with external clock source.
  • Supports either analog or PWM dimming.
  • Fault protection.

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Datasheet Details

Part number IS31LT3957A
Manufacturer Lumissil
File Size 604.77 KB
Description HIGH VOLTAGE LED LIGHTING CONTROLLER
Datasheet download datasheet IS31LT3957A Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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IS31LT3957A HIGH VOLTAGE LED LIGHTING CONTROLLER WITH FAULT PROTECTION March 2020 GENERAL DESCRIPTION The IS31LT3957A is a current mode PWM controller designed to drive a low side external NMOS FET for wide input/output voltage range and high LED current applications. An external resistor senses the high side output current of the LED string. A high side sense is the most flexible current sensing scheme, since it functions in either boost or buck-boost mode configurations. The controller can be configured with an external resistor to operate between 100kHz~1MHz frequency resulting in small external inductor and capacitors while maintaining high efficiency.