[Diy_efi] Flyback Diode (was 555 timer...)

[Paul Bidmead]

yea your right
i went home last night and checked it and i wasn't driving the 640's gate 
high enough
thats why i switched to the logic level fet.

//BidSpec
----- Original Message ----- 
From: <dh at busb.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, July 11, 2005 9:54 PM
Subject: Re: [Diy_efi] Flyback Diode (was 555 timer...)


> You can't drive it too hard unless you take the gate outside the supplied
> voltage of the source and drain.  To the contrary, the greater the gate
> voltage (N-chan) the more 'on' the device (lower resistance and voltage
> drop.)
>
> dh
>
> ----- Original Message ----- 
> From: "Paul Bidmead" <bidmeadp at iinet.net.au>
> To: <diy_efi at diy-efi.org>
> Sent: Monday, July 11, 2005 12:40 AM
> Subject: Re: [Diy_efi] Flyback Diode (was 555 timer...)
>
>
>> beg my pardons....... i am using a different FET after i cooked a few
> '640s
>> from a low R injector on my gen-set
>> i then went to ecuv2.0 with the surface mount FET rated at 60v 40amps and
> a
>> 2" sqare heatsink i havnt blown one up yet (touch wood) but it doesnt get
>> hot.
>> im not sure if im driving it too hard but it "seems" not to mind
>>
>> //BidSpec
>>
>> ----- Original Message ----- 
>> From: "mike turner" <yardcooliediy at charter.net>
>> To: <diy_efi at diy-efi.org>
>> Sent: Saturday, July 09, 2005 6:11 AM
>> Subject: Re: [Diy_efi] Flyback Diode (was 555 timer...)
>>
>>
>> > The integral diode is generally slower than the external diode. This
>> > raises its dissipation above that of a faster diode. Also, using an
>> > external diode moves that dissipation off the mosfet which might be
> needed
>> > if you have omitted the mosfet heat sink for the bench test. :)
>> >
>> > Mike Turner
>> > _______________________________________________
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>>
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