IRPLLED1

IRPLLED1 (Rev D Version)

350mA to 1.5A High Voltage LED Driver using

IRS2540,1 or IRS25401,11

Table of Contents

Page

1. Introduction………………………………………………………………...….1

2. Constant Current Control.......................................................................3

3. Frequency Selection ..............................................................................6

4. Output L1 and COUT Selection .............................................................6

5. MOSFET vs Diode for the low side switch.…………...………………….12

6. VCC Supply ...……………………………………………………………….15

7. VBS Supply ………………………………………………………………….16

8. Enable Pin ……….………………………….……………………………….17

9. Over voltage protection………………….……………………………....….22

10. Other Design Considerations .…………….……………………………...24

11. Design Procedure Summary ……….…………………………………….25

12. Bill of Materials ………………………..……………………………….26-27

13. PCB Layout ………………………………………………………………...27