Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t7ACcs5X024313 for ; Mon, 10 Aug 2015 14:38:54 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZOmJ9-0004Co-W8 for rs_out_1@blacksheep.org; Mon, 10 Aug 2015 13:36:03 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZOmJ9-0004CZ-Hb for rsgb_lf_group@blacksheep.org; Mon, 10 Aug 2015 13:36:03 +0100 Received: from mx02.posteo.de ([89.146.194.165]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1ZOmI4-0001xG-Mw for rsgb_lf_group@blacksheep.org; Mon, 10 Aug 2015 13:36:02 +0100 Received: from dovecot04.posteo.de (unknown [185.67.36.27]) by mx02.posteo.de (Postfix) with ESMTPS id B0CD525ACC40 for ; Mon, 10 Aug 2015 14:34:40 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot04.posteo.de (Postfix) with ESMTPSA id 3mqcDw32nszFpWD for ; Mon, 10 Aug 2015 14:34:40 +0200 (CEST) Message-ID: <55C89A4A.2030602@posteo.de> Date: Mon, 10 Aug 2015 14:34:18 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <1892164761.20150810130954@chriswilson.tv> In-Reply-To: <1892164761.20150810130954@chriswilson.tv> X-Scan-Signature: 0b2d339ae1d48966556dfb6ad64e2bce Subject: Re: LF: Protecting a MOSFET driver chip from MOSFET failure? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3840 Am 10.08.2015 14:09, schrieb Chris Wilson: > 10 August 2015 > > > Is there a way of protecting a typical MOSFET driver IC from being > taken out by a MOSFET failure in a Class E LF amp? > Hi Chris, It can be helpful to use a RF transformer between driver and FET. This also allows you to have negative voltages during the OFF period. Even with rectangular voltages and a high Ciss of a few nF, it works well. I'm using a ferrite core between an IXDD414CI and 4xIRFP460 73, Stefan