BCR430ULEDBOARDTOBO1 Infineon

ER 201704 PL39 008 Linear LED driver with BCR430U Low-voltage-drop LED driver board up to 100 mA About this document Scope and purpose This document presents an evaluation board design for a linear and low-voltage-drop LED driver based on an Infineon BCR430U controller IC. It is an engineering report on features and performance for a 24 V/100 mA (max. LED current) solution, with explanations covering circuit and layout design. BCR430U is a linear LED controller IC in a small PG-SOT23-6-1 package regulating the LED current in standalone operation without any external power transistor. Intended audience This document is intended for design engineers, application engineers and students, for example, who need to design low-cost, highly reliable linear LED drivers for: LED strips LED displays and channel letters Architectural and landscape lighting Retail lighting Table of contents About this document ....................................................................................................................... 1 Table of contents ............................................................................................................................ 1 1 Introduction .......................................................................................................................... 2 2 Technical specification ........................................................................................................... 2 3 List of product features ........................................................................................................... 2 4 Circuit description .................................................................................................................. 2 4.1 Circuit diagram ........................................................................................................................................ 2 4.2 Configuration ........................................................................................................................................... 2 5 PCB layout ............................................................................................................................. 2 6 Bill of Materials (BOM) ............................................................................................................ 2 7 Test results ............................................................................................................................ 2 7.1 Ambient temperature (T ) from -40C to 125C ...................................................................................... 2 A 7.1.1 On-board LEDs as the load ................................................................................................................ 2 7.2 More measurements ............................................................................................................................... 2 Revision history.............................................................................................................................. 2 Engineering Report Please read the Important Notice and Warnings at the end of this document V 1.2 www.infineon.com/bcr430u 2020-10-14 Linear LED driver with BCR430U Low-voltage-drop LED driver board up to 100 mA Introduction 1 Introduction This is an engineering report for a 24 V, 100 mA linear LED driver evaluation board. This document contains the technical specification for the LED driver, a description of the main features, and circuit and layout descriptions, as well as the measurement results. In this application, an Infineon BCR430U is used as an LED driver IC. It regulates the LED current in standalone operation without any external power transistor. The LED current level can be adjusted up to 100 mA by connecting a high ohmic resistor Rset to pin RS. The default LED current is set to 50 mA with an Rset of 12 k. The voltage drop at the integrated LED driver stage can typically go down to 135 mV (refer to Figure 12), improving the overall system efficiency and providing extra voltage headroom to compensate for tolerances of LED forward voltage or supply voltage. A smart over-temperature protection function reduces the LED current when the junction temperature of BCR430U is very high. 1 6 N.C. LED 2 5 GND N.C. 3 4 RS VS Figure 1 BCR430U pin definition Figure 2 Top and bottom side of the reference design board (55.1 mm x 33.7 mm) Engineering Report 2 V 1.2 2020-10-14