I have been trying to a get 4 of these working in an H-bridge also, but
perhaps I've been lead astray.  I was lead to believe that the gate voltage
needed to be 5v+Vds.  Is 5v enough to turn a 540 on completely?

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Roman Black
Sent: Tuesday, July 17, 2001 11:22 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: IRL540 MOSFET Question


Yep! They're designed for driving inductive loads
and the diodes match the FETs for performance.
The diodes are generally schottky or fast recovery
and have low on drop, 0.2v at medium currents is
common. But as someone said, often it's more
efficient to turn the FET on for flyback and let
the FET handle the reverse electrons.
-Roman


Dan Michaels wrote:
>
> Another question related to motor control. I am looking at
> building a discrete hi-current h-bridge using IRL540 [n-chan]
> and IRL5305 [p-chan] MOSFETs.
>
> These devices have an internal "body diode" that is in the
> exact configuration that, if 4 of these devices were hooked
> up in a full h-bridge config [p-chan above, n-chan below],
> that the diodes would fit together to form a perfect bridge
> clamp.
>
> The question is - the specs indicate these body diodes are
> quite fast and able to handle large currents, and I just wanted
> some outside verification that they are adequate to the inductive
> spike clamping job. Yes ????//
>
> thanks,
> - dan michaels
> www.oricomtech.com
> =========================
>
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