Table of Contents
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ILD8150 80 V high side buck LED driver IC with hybrid dimming
Introduction
2.3.5
2.3.6
2.4
Layout consideration ....................................................................................................................................... 11
2.5
Design example ................................................................................................................................................ 12
2.5.1
................................................................................................................................................. 12
2.5.2
Select switching frequency ........................................................................................................................... 13
2.5.1
Inductor value and its current calculation ................................................................................................... 13
2.5.2
Diode selection .............................................................................................................................................. 13
2.5.3
capacitor selection ................................................................................................................................... 13
2.5.4
capacitor selection ................................................................................................................................. 13
2.5.5
Bootstrap capacitor C
2.5.6
V
capacitor C
3
Application circuit .................................................................................................................... 15
3.1
Schematic layout .............................................................................................................................................. 15
3.2
PCB layout ......................................................................................................................................................... 16
4
Measurement results with reference design ................................................................................ 17
4.1
LED current vs supply voltage .......................................................................................................................... 17
4.2
Dimming ............................................................................................................................................................ 18
4.3
Soft-start ........................................................................................................................................................... 19
4.4
Cycle-by-cycle current limitation ..................................................................................................................... 19
4.5
Efficiency ........................................................................................................................................................... 20
4.6
Thermal behavior ............................................................................................................................................. 20
4.7
Output current ripple ....................................................................................................................................... 21
5
Application with flyback converter XDPL8218 ............................................................................. 23
6
Appendix A .............................................................................................................................. 24
7
References .............................................................................................................................. 26
Revision history............................................................................................................................. 27
Application Note
selection .................................................................................................................... 11
selection ............................................................................................................... 11
selection ............................................................................................................... 14
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V 1.0
2019-01-23
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