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Groups > sci.electronics.design > #518985
| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Fet G-S zener |
| Date | 2018-10-11 13:05 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <ppo3c2$ukg$1@dont-email.me> (permalink) |
| References | <6d28623e-8ace-49bb-902e-a2fb20f750a7@googlegroups.com> |
"George Herold" <gherold@teachspin.com> wrote in message news:6d28623e-8ace-49bb-902e-a2fb20f750a7@googlegroups.com... > Well I just blew out the G-S junction of a fet. I'm going to redesign > circuit > a bit... but I was also thinking of adding a ~15V G-S zener. > (V_GS max = +/- 20 V) > Is there any downside I should think about? > I guess I'd need some sort of current limit. (Resistor at a minimum) > > George H. You mean besides the obvious ones (conduction current, blocking leakage..)? Capacitance I guess, which can lead to gate oscillations, especially on modern FETs (SuperJunction) which like to sing at 300-400MHz (where even a 50pF zener is a fine resonant stub). A little gate resistance or ferrite bead as usual. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/
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Fet G-S zener George Herold <gherold@teachspin.com> - 2018-10-11 09:37 -0700
Re: Fet G-S zener "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-11 13:05 -0500
Re: Fet G-S zener George Herold <gherold@teachspin.com> - 2018-10-11 12:17 -0700
Re: Fet G-S zener Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-11 15:36 -0400
Re: Fet G-S zener George Herold <gherold@teachspin.com> - 2018-10-11 13:01 -0700
Re: Fet G-S zener sea moss <danluster81@gmail.com> - 2018-10-11 18:22 -0700
Re: Fet G-S zener George Herold <gherold@teachspin.com> - 2018-10-11 20:16 -0700
Re: Fet G-S zener Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-12 08:33 -0400
Re: Fet G-S zener John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-11 15:50 -0700
Re: Fet G-S zener piglet <erichpwagner@hotmail.com> - 2018-10-12 10:13 +0100
Re: Fet G-S zener George Herold <gherold@teachspin.com> - 2018-10-12 06:18 -0700
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