Re: MOSFET GOT XTREMELY HOT

On Thu, 08 May 2008 22:40:05 +0100, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:



bigcaboy@xxxxxxxxx wrote:

I just used the IRFP044 as picture shows but it gets extremely hot at
8A DC. It buzzed and I saw a sine wave stacked DC at Gate. Is't
caused by the linear region resistance?

got a picture from other website:

http://www.unsp.com.cn/app/pic/2006526115419.jpg

or any other reasons?

Hard to tell without more info but why have you got a 10k resistor in the
gate drive circuit ? You should be using a few hundred ohms at most.

Graham

Local feedback from the op amp output will make it easier to servo
into a stable gate drive voltage, as well.

RL
.