Re: TC1410 MOSFET driver problems

On 14 Mar, 03:53, "Paul E. Schoen" <pst...@xxxxxxxxx> wrote:
<j...@xxxxxxxxxxxxxxxxxxxxx> wrote in message

[...]

The test circuit in the data *** is a 100 kHz square wave. The rise and
fall times of the IC are 25-40 nSec. While the circuit was working, the
driver stayed cold, and my simulation showed less than 100 mW. The
three-transistor driver has rise and fall times of about 200 nSec. The
Microchip App Note shows a 250 kHz example with 16 mW driver power.

I think there is something else wrong. I have not heard back yet from
Microchip. I have also requested samples of some TI parts that have an
output stage consisting of MOSFETs in parallel with bipolars, which
provides better drive through the transition area where the MOSFET actually
switches.

Thanks for your comments.

Paul

Yes. I missed the 100kHz test diagram. Just spiced it myself though
and am seeing roughly 100ma rms gate drive but more interestingly (at
switch off) there's a 10V peak, delayed negative voltage pulse feeding
back to the driver (about 200nS wide). Seems the driver's reverse
limit is 5V.
john


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