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.

TPS92641控制灯珠时电流达不到

Other Parts Discussed in Thread: TPS92641

HI,

我正在用TPS92641控制大约500个0.5w白光灯发光,10个灯珠串联,并联50条,因为每个灯珠需要3V@120mA,总电流要达到5A。

输入电压电压48V;

Fsw=(330kk+20k)/(20k*33k*1200pf)=442kHz

Rcs=0.15

两个MOS管用的是PSMN069_100YS

我的PWM固定在200Hz,占空比调到100%,电感用的是100Uh,模拟电压调节范围在0-2.5v,

负载我无论并联多少灯,总电流最大值基本都在900mA左右,没办法在上升,我试着将Rcs换成0.1或者0.05都没有改变!

能给出什么建议吗?