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Re: DRSSTC question
- To: tesla@xxxxxxxxxx
- Subject: Re: DRSSTC question
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Sat, 24 Sep 2005 11:57:04 -0600
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- Resent-date: Sat, 24 Sep 2005 12:04:05 -0600 (MDT)
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Original poster: Steve Conner <steve@xxxxxxxxxxxx>
Bare IGBTs will flow current in the opposite direction
due to the body diode on the IGBT die
IGBTs don't have a body diode. It's more of a sort of 15V zener like
what a BJT has. It can't stand any significant level of reverse
current, so in a DRSSTC application it's vital to use IGBTs with
built-in diodes, or add your own.
Some good fast diodes I know of are the RHRP and RHRG series from Intersil.
IGBTs with built-in diodes have an actual real fast rectifier on a
separate chunk of silicon. The maker basically takes one of their
IGBT dies and one of their fast rectifier dies, and sticks them side
by side in the same package. (The jargon term is "co-packaged".)
Hence the diode is as good as any fast diode you can buy. It's not an
inferior parasitic diode like in a MOSFET.
Steve Conner
http://www.scopeboy.com/