Return-Path: X-Spam-DCC: paranoid 1290; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL 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 t7AIcYhY026342 for ; Mon, 10 Aug 2015 20:38:34 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZOrvP-0005vW-AU for rs_out_1@blacksheep.org; Mon, 10 Aug 2015 19:35:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZOrvP-0005vN-0i for rsgb_lf_group@blacksheep.org; Mon, 10 Aug 2015 19:35:55 +0100 Received: from nm33-vm3.bullet.mail.ir2.yahoo.com ([212.82.97.108]) by relay1.thorcom.net with esmtps (TLSv1:ECDHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1ZOruN-0003A8-N4 for rsgb_lf_group@blacksheep.org; Mon, 10 Aug 2015 19:35:53 +0100 Received: from [212.82.98.59] by nm33.bullet.mail.ir2.yahoo.com with NNFMP; 10 Aug 2015 18:34:38 -0000 Received: from [212.82.98.74] by tm12.bullet.mail.ir2.yahoo.com with NNFMP; 10 Aug 2015 18:34:38 -0000 Received: from [127.0.0.1] by omp1011.mail.ir2.yahoo.com with NNFMP; 10 Aug 2015 18:34:38 -0000 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 621703.14613.bm@omp1011.mail.ir2.yahoo.com Received: (qmail 78250 invoked by uid 60001); 10 Aug 2015 18:34:38 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1439231678; bh=W8BR+SxudrG+ot2mKSBZ1Np7Abdr4XupRLvg3mbRyHo=; h=Message-ID:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=3pFihsUoim4gHx2EaJXc2nTDZI38MAE3ZySI1nwx1x30vQAJMqUglkEudNgFhKBsGQ1z+ITftrbkWtBOeNmuA4tKfd1Jj7FSQonC9eNAsc2l7ZpnP7exTUX0xM8sT/fRkMMyLWxNcbp4d8ZhwQFCEOnboD0eTcTVPlJhUUn0gH8= X-YMail-OSG: IeBQdxMVM1npdT.pxAYiASQy2h1HM0K1RB1gFdAUFWWeAa8 ChaKM9.16A8JseCykOJcx0gDELX7BmYiie2GT5t03nRdIaCwrof92vPC3q59 .53MYkX1_aMxEpzaURCbpgC4OdQyLfu__dJ0KzT66ucM5A.D6lcKfr6ymcW5 NhgrPprC0iFSgWSm3cVo2815UDWZwNY.o6kja0EsLFXriTVq7IAB.f7Rxwuk hoUgWvPt3eYoBxoQ2vY6RDgZiJucGtjm94_zbIWw2.aeGIEdl613MJCPO9_8 3l_G2ES2cfsWlkjG3nJLTb8Pb.XEpXVrO2tnoKQfmVmdej84hA4fxjZL7.Zq A3XMZk_YAUL6R7f6DObK4jcqDk7WHDnxEL1Ado8dW8Ap4jcfJMroQzjzDAFu k5vqu8OO2pCr140xGD8BMjLbX.nSVbNhWr5m5MSxXsQbGsqC_BSOkO1LmMUZ XV9NjMnV8CPVA4uvBhFPAytVsH25oCE3zDyFdHHC6IeML4QTA1tVuDgJ6B5p y8Jw9t_7qOlYEZ2oZ1g53ntqJT4g4XiKrwKVxk.oqe3OQp.OCRQuDOt9802i Cqy1oU.4- Received: from [176.227.128.81] by web173005.mail.ir2.yahoo.com via HTTP; Mon, 10 Aug 2015 19:34:38 BST X-Rocket-MIMEInfo: 002.001,SGkgDQoNCk15IHRlbiBjZW50cyB3b3J0aC4uLi4NCklmIHlvdSBoYXZlbid0IGxvb2tlZCBhdCBpdCBiZWZvcmUgdHJ5IGh0dHA6Ly93d3cuY3MuYmVya2VsZXkuZWR1L35jdWxsZXIvQUlJVC9wYXBlcnMvcmFkaW8vU29rYWwlMjBBQUNENS1wb3dlcmFtcHMucGRmLiAgUGxvdWdoIHRocm91Z2ggdGhlIG1hdGggYW5kIHRoZW4gZm9yZ2V0IGxvb2sgYXQgdGhlIGZpbmFsIHNlY3Rpb24gb24gZW1waXJpY2FsbHkgc2V0dGluZyB0aGUgZGV2aWNlIGluIGNsYXNzIEUuIFRoaXMgd29yayBzaGVldCB0aGF0IGhhcyABMAEBAQE- X-Mailer: YahooMailBasic/605 YahooMailWebService/0.8.203.812 Message-ID: <1439231678.71969.YahooMailBasic@web173005.mail.ir2.yahoo.com> Date: Mon, 10 Aug 2015 19:34:38 +0100 From: M0FMT To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Scan-Signature: 5c335215f1b3de26d890ee84d49616ce Subject: LF: Protecting a MOSFET driver chip from MOSFET failure? Content-Type: text/plain; charset=iso-8859-1 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id t7AIcYhY026342 Status: O X-Status: X-Keywords: X-UID: 3852 Hi My ten cents worth.... If you haven't looked at it before try http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-poweramps.pdf. Plough through the math and then forget look at the final section on empirically setting the device in class E. This work sheet that has saved me from destroying endless devices. A smooth transition of the Drain volts is important by accurately setting the shunt capacity C1.. Make sure you do not over drive the gate. Make sure the Gate wave is uniform preferably a fast rising square wave ON time equal to OFF time for best drive efficiency. A driver helps but not mandatory. This amp will run (relatively) cool at unbelievable efficiency 90%+ and take a lot of mis-loading abuse. Look at Rog's GW3UEP website as well. 73 es GL Pete M0FMT IO91UX Sent via my own personal Too-Way (two way) Earth Station to and from the Eutelsat Ka-band satellite  http://www.tooway.co.uk/  at approximately 172 degrees Azimuth in the Clarke belt owing to BTs 19th century cable technology inability to provide a good enough 21st century broadband service. I agree for this message to be passed on to BT Plc at 81 Newgate Street, London EC1A 7AJ  via the snoops at GCHQ Cheltenham, thanks for your cooperation it is appreciated.