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LM3402 Datasheet 0.5A Constant Current Buck Regulator

Manufacturer: National Semiconductor (now Texas Instruments)

General Description

The LM3402/02HV are monolithic switching regulators designed to deliver constant currents to high power LEDs.

Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 735 mA (typical) for step-down (Buck) regulators.

Hysteretic control with controlled on-time coupled with an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series - parallel connected arrays of LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low-power shutdown and thermal shutdown complete the

Overview

www.DataSheet4U.com LM3402/LM3402HV 0.5A Constant Current Buck Regulator for Driving High Power LEDs October 2006 LM3402/LM3402HV 0.

Key Features

  • Integrated 0.5A N-channel MOSFET VIN Range from 6V to 42V (LM3402) VIN Range from 6V to 75V (LM3402HV) 500 mA Output Current Over Temperature Cycle-by-Cycle Current Limit No Control Loop Compensation Required Separate PWM Dimming and Low Power Shutdown Supports all-ceramic output capacitors and capacitor-less outputs n Thermal shutdown protection n MSOP-8 Package n n n n n n n n.