PMP2493 Reference Design

Texas Instruments

Buck Converter with Minimum Component Count to Drive LEDs (11.3V @ 400mA)

Description

The TPS40200 controller can be used as a low-cost LED driver. With an input voltage rating of 4.5 to 52 V: it can power LED strings with regulated current and up to a 45 V drop across the string. Current is sensed across a resistor between the cathode of the string and ground and is compared against a 696 mV reference to provide regulated current. Because the driver is a buck and not a boost or flyback: an open string will not produce voltages above the input voltage and over-voltage protection is not needed. The driver can operate in either the continuous or discontinuous mode. For output voltages above 35 V the discontinuous mode is needed due to duty cycle limitation above 35 V. The circuit shown has a Pulse Width Modulator (PWM) input for dimming purposes. Targeted current can be set with jumpers.

Features
Applications
Product Categories
  • Power management

Parts

Part Number Name Companion Part
TPS40200 TPS40200 Buy Datasheet
UCC2897 UCC2897 Buy Datasheet

Bill Of Materials

Download the bill of materials for PMP2493 Download

Other Documents

Title Updated Type Size (KB)
PMP2493 BOM 17 Jan 2011 PDF 20
PMP2493 SCHEMATIC 17 Jan 2011 PDF 88