Re: High side driving N-channel Mosfet with PWM

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#1883

From: a7yvm109gf5d1
Date: Mon, 05 May 2008 13:36

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On May 5, 7:24 am, "Phil in Melbourne" <reply@tonewsgroup> wrote:
> So I would have thought that this would be a simple problem but the more
> information I get the more I get confused......
>
> I want to PWM a whole lot of LEDs. The current consumption of the bank of
> LEDs is in the order of 15 Amps, at 12V.
>
> For reasons I won't go into, my only option is to use a high side mosfet.
>
> I have chosen an N-channel MOSFET (IRL3803) mainly because of its huge
> current capability and very low on resistance of 7 milli ohms.
>
> I am hoping to use PWM at a reasonably high frequency, say 20khz or higher,
> and I want to use an efficient MOSFET driver IC that is designed for the
> job.

Why so high? If it's just for brightness control, you don't need that
surely?

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From: a7yvm109gf5d1@netzero.com
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: High side driving N-channel Mosfet with PWM
Date: Mon, 5 May 2008 06:36:37 -0700 (PDT)
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