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TPS92391: 频率以及感值如何确认

Part Number: TPS92391

你好,请问一下

IC spec有三种应用

1、Full Feature Application for Display Backlight

2、Application With Basic/Minimal Operation

3、SEPIC Mode Application  请问这三种运用时,频率以及电感感值是如何确定选择的,之前有个项目输出电流460mA/26.1V 选择 1818K、电感选择10UH 效率很低,更改频率400K效率OK。想要了解一下,频率以及电感是如何确认的