Re: TI UC2710 vs. Microchip TC4422 FET drivers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Rob: what is the frequency top end of the TC4422?  Your testing may have
found this. It looks like a very useful substitute for a tube.
   Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Fri, 05 Jul 2002 18:12:29 -0600
> To: tesla-at-pupman-dot-com
> Subject: TI UC2710 vs. Microchip TC4422 FET drivers
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Fri, 5 Jul 2002 18:17:09 -0600
> 
> Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <rob-at-pythonemproject-dot-com>
> 
> I built both of these chips into my SSTC driver so I could compare
> them.  Here is what I found:
> 
> Both chips are somewhat idiot proof, as they survived being interchanged
> into the wrong sockets and powered up behind an 18V regulator.  Dohhh!
> 
> 1.  UC2710-  big plus, thermal shutdown.  Minus points for wasting
> output swing. Chip has a Vdd max of 18V, which means if you are going
> thru a gate transformer it cuts (18V-Vsatplus-Vsatminus) in half at 50%
> duty cycle.  You want every millivolt of swing, and you don't get it
> with this chip.
> 
> 2.  TC4422- big plus, 9A peak vs. the UC2710's 6A peak.  Big plus, its
> CMOS and swings rail to rail.  I'm getting about 0.5V more drive at the
> gate of my FETS.  Minus point, 18V max.  I'd like to see a couple more
> volts of output swing.  Another minus point, no thermal protection.
> But, because it swings rail to rail, it runs cooler as no power is
> wasted in saturation, so that is a plus.
> 
> Overall, it seems the TC4422 has the edge, and its $5.00 cheaper at
> Digikey.
> 
> Rob.
> 
> 
> 
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