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From: "Peter Larsson"
Subject: Transient problem !
Date: Thu, 9 Jan 2003 23:23:12 +0100
NNTP-Posting-Date: Thu, 9 Jan 2003 22:24:05 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
I have this circuit:
| | 10 ohm (0,1uH series inductance)
The problem is this: I drive this test application with an 12V car battery.
The gate is driven by a MAX627 mosfet driver(runs at 100kHz) with
0.1uF(polyprop) and 680uF (low esr electrolytic) connected on the supply
line and close to the MAX627 from the same battery.
There is a high transient over the drain and source at turn off. The
transient is about 25 volts between drain and source and very narrow.
If I parallel another 10 ohm resistor the transient increases to 40 volts.
When the GROUND line is measured, there are also an increase of the
transient towards the electrolytic cap. This capacitor has been removed and
the result is ringings over the squrewave but the transient is still there !
My question is where does this come from?
Source inductance:13 nH
Drain inductance:5 nH
How can I find the source of this narrow transient ?
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