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Article #1896Re: High side driving N-channel Mosfet with PWM
From: Tim Williams
Date: Tue, 06 May 2008 06:32
Date: Tue, 06 May 2008 06:32
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"Phil in Melbourne" <reply@tonewsgroup> wrote in message news:481eee7b$0$17511$afc38c87@news.optusnet.com.au... > I have chosen an N-channel MOSFET (IRL3803) mainly because of its huge > current capability and very low on resistance of 7 milli ohms. You can get P-channel MOSFETs in similar ratings. Maybe not quite so small Rds(on), but certainly in the amperage you need at that voltage. There are plenty of lower voltage P-channels (whereas the supply kind of dries up over 200V, sadly). Stick a zener on the gate to protect it from nasty automotive supply voltages and you can practically drive it from a naked 2N3904 collector sinking to ground. Tim -- Deep Fryer: A very philosophical monk. Website @ http://webpages.charter.net/dawill/tmoranwms
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X-Google-Thread: 112d1e,23a05bb8461714c3 X-Google-Thread: 103407,23a05bb8461714c3 X-Google-Attributes: gid112d1e,gid103407,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news1.google.com!news3.google.com!out04a.usenetserver.com!news.usenetserver.com!in02.usenetserver.com!news.usenetserver.com!in03.usenetserver.com!news.usenetserver.com!hwmnpeer01.phx!news.highwinds-media.com!hw-filter.lga!newsfe05.lga.POSTED!53ab2750!not-for-mail From: "Tim Williams" <tmoranwms@charter.net> Newsgroups: sci.electronics.design,aus.electronics References: <481eee7b$0$17511$afc38c87@news.optusnet.com.au> Subject: Re: High side driving N-channel Mosfet with PWM Lines: 19 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <2YSTj.117$xo5.81@newsfe05.lga> NNTP-Posting-Host: jkonhpkcapfkohaancjdpecajnjegdeb X-Complaints-To: abuse@charter.net X-Trace: dbkajaeeceiapgbcoldnlfdnfaaakleeajhnfhiampefkgicjkonhpkcapfkohaacfbhgfnifmddoeeenieeojhfohkcmmkbilnfeopnkgdhfihocngphleghpdncbocneoickjoboohodkb NNTP-Posting-Date: Mon, 05 May 2008 23:32:30 MST Date: Tue, 6 May 2008 01:32:05 -0500