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From: Mike Poulton
Subject: Re: Problems with MOSFET drivers
Date: 18 Nov 2002 00:02:42 GMT
Organization: MTP Technologies
On 17 Nov 2002, email@example.com (Eric Y. Chang) said:
> markp (firstname.lastname@example.org) wrote:
>: itself may have already acted as the 'fuse', putting an external fuse
>: in will do nothing other than waste money on fuses. See thinking
>: through the problem above.
> 'fuse' in quote marks did not mean an actual fuse. It meant a fast
> electronic circuit breaker. These can pay for themselves in just a
> few applications. Another trick is the "chicken resistor" which is
> exactly what it sounds like. You should be able to find that term
> on google.
Current limited power supplies are better than either of those. Any
type of fuse stops operation as soon as a fault occurs, making it hard
to find the fault. If the breaker is fast enough to protect MOS
devices, then it is also fast enough to trip from normal current
transients, or from the charging of filter capacitors at power-on.
Series resistance drops voltage during normal operation, which is not
acceptable for a mosfet driver, especially when the normal operating
current is only slightly below the maximum permssible current. I got my
hands on a real nice constant-current lab supply with adjustable
compliance. Had to give it back the same day, though.
Not only do I speak for my company, I AM my company!
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