Re: Paralleling FET's

• To: tesla-at-pupman-dot-com
• Subject: Re: Paralleling FET's
• From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 17 Oct 1999 19:32:00 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Bryan wrote:

> To put FET's in parallel, you have to find out each one's turn on
> information exactly.  Then you have to put equalizing resistors in the
> gate so that they all turn on at the _same_ time and the _same_ amount.

FETs don't drain DC gate current. Most power MOSFETS can be directly
connected in parallel without equalizations systems, because they
conduct less if they become hot. You equalization method is applicable
to bipolar transistors, but it would be safer to put equalization 
resistors in series with the emitters. You can also put equalization
resistors in series with the sources of MOSFETS, but this is usually
not necessary.

Antonio Carlos M. de Queiroz

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