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TPS61196: PWM占空比小于0.1%时,电路无法正常工作

Part Number: TPS61196


VIN:12V

VOUT:36V

ISET:80mA

fsw:200KHZ

PWM:频率f:2khz;占空比D:0.06%

当PWM占空比由10%调至0.06%时,常温下(25℃)LED可正常工作,但在高温下(70℃),LED不工作,并且讲占空比调回10%时,LED也不工作。

想问:PWM的占空比(或PWM开启时间)受哪些因素影响?内置MOS管的爬坡时间?SW的PWM控制模式和PFM控制模式的转换时间?