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Evaluation board: CAT4238 10-LED boost converter

Posted: 22 Oct 2008     Print Version  Bookmark and Share

Keywords:CAT4238  DC/DC converter  LEDs 

This document by Denisa Stefan, applications engineer with Catalyst Semiconductor, discusses the CAT4238EVAL1 evaluation board for CAT4238 high efficiency 10-LED boost converter. The functionality and major parameters of the CAT4238 can be evaluated with the CAT4238EVAL1 board.

The CAT4238 is a high voltage CMOS constant-current DC/DC converter that has been designed to drive with high efficiency white or other high brightness LEDs. The high-voltage output stage allows driving up to 10 white LEDs in series. A single external resistor sets the LED current between 5mA and 40mA. LED current can be adjusted using either a PWM signal or a DC voltage. Detailed descriptions and electrical characteristics are in the CAT4238 data sheet.

The evaluation board contains a CAT4238 DC-DC boost converter in a typical application circuit. As configured, the board circuit is set to drive up to 10 white LEDs in series. The user can chose to connect the CAT4238 output to the on-board LEDs string or to an external LEDs string from an application.

View the PDF document for more information.

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