This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS61165: 用于驱动8串2并白光LED,无法点亮LED驱动电压低

Part Number: TPS61165


SCH和PCB设计如图,焊接恒温加热板250度,

实际使用的元件D1为SBD10L45A,C1修改为4.7uF,其余元件符合原理图内,

测试时连接,8串2并LED,恒流电阻配置为0.666R(1R并2R)驱动电流300mA(150+150),

信号源输入50kHz方波占空比99%,测量得最高输出电压18V,无法点亮LED,无电流。

短路末端四颗LED,可以微点亮剩余的颗LED,电流7mA,

短路末端五颗可以高亮剩下的三颗,但电流已超过设定的恒流值300mA达到了500mA。