Re: MOSFET Driver cannot drive a MOSFET? or something wrong?
- From: Mark <makolber@xxxxxxxxx>
- Date: Wed, 14 May 2008 08:10:55 -0700 (PDT)
On May 14, 3:06 am, bigca...@xxxxxxxxx wrote:
1-2 ohm but didn't work.
On May 13, 1:52 pm, James Arthur <dagmargoodb...@xxxxxxxxx> wrote:
On May 12, 11:31 pm, bigca...@xxxxxxxxx wrote:
Here is my circuits, simple, yet, when I disconnect the MOSFET and
load from the circuits, the waveform, duty cycle, amplitude,
everything else is correct. After I connect the mosfet and load (here
I didn't use a laser diode, in stead I use a 1 ohm power resistor),
all 're in a messy! MOSFET is hot coz it's not fully on, square wave
form contains a lot of ringing, overshoot, duty cycle? no duty cycle
but some weired square waves with spikes.
It is a very common circuits but I wonder something wrong?
http://www.dianyuan.com/bbs/u/65/2567951210659430.jpg
Where's your gate resistor? You need one.
(Methinks your FET screams.)
Cheers,
James Arthur- Hide quoted text -
- Show quoted text -
what rate are you switching at?
what is the gate capacitance of your FET?
can the driver drive that capacitance at that speed?
Mark
.
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- MOSFET Driver cannot drive a MOSFET? or something wrong?
- From: bigcaboy
- Re: MOSFET Driver cannot drive a MOSFET? or something wrong?
- From: James Arthur
- Re: MOSFET Driver cannot drive a MOSFET? or something wrong?
- From: bigcaboy
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