Difference between these two MOSFET driver chips / General Science and Electronics / Forums

Forums

4hv.org :: Forums :: General Science and Electronics

« Previous topic | Next topic »

Difference between these two MOSFET driver chips

Move Thread

LAN_403

Alex M

Fri Jan 20 2012, 01:39AM

Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552

What is the difference between inverting and non inverting MOSFET driver IC's?

UCC37322P and UCC37323P

What does inverting and non inverting mean? and which one should I use for driving an N-channel MOSFET?

I am switching the MOSFET's at around 50khz and need fast switching for my halfbridge driver in order to try and reduce MOSFET heating as much as I can by ensuring the gates are being driven well.

Thanks.

Fri Jan 20 2012, 01:52AM

Registered Member #4146 Joined: Tue Oct 18 2011, 02:01AM
Location: Wisconsin, U.S.A
Posts: 56

The inverting chip will put out the opposite polarity of what you put into it and the non-inverting will put out the same polarity you put into it. Well atleast i'm pretty sure but who knows i could be wrong.

Inducktion

Fri Jan 20 2012, 03:58AM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

You mean UCC37322P and UCC37321P?

The non inverting chip will output a high when the input signal is high. The inverting chip will output a low when the signal input is high.

Make sense? :o

Alex M

Fri Jan 20 2012, 04:57PM

Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552

Inducktion wrote ...

You mean UCC37322P and UCC37321P?

The non inverting chip will output a high when the input signal is high. The inverting chip will output a low when the signal input is high.

Make sense? :o

Yes that makes sense ( :

No I meant UCC37322P and UCC37323P, I got them from TI. Do they come in matched pairs and do I need to use one of each? or if not which one should I use for driving an N-channel MOSFET?

Thanks.

m4ge123

Fri Jan 20 2012, 06:02PM

Registered Member #4118 Joined: Mon Oct 03 2011, 04:50PM
Location: MD
Posts: 140

It doesn't matter. Just know that your signal will be inverted if you use the inverting one.

Inducktion

Fri Jan 20 2012, 07:12PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Then that's not right.

The ones I listed are complementary pairs, they both are essentially the same chip, just one inverts and the other doesn't.

The UCC37323P chip you listed is a dual 4 amp non-inverting AND inverting chip contained in one nice package

While the UCC37321P and the UCC37322P are 9 amp drivers, where the UCC37321P is the inverting version, and the UCC37322P is the non inverting.

Alex M

Fri Jan 20 2012, 07:57PM

Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552

Inducktion wrote ...

Then that's not right.

The ones I listed are complementary pairs, they both are essentially the same chip, just one inverts and the other doesn't.

The UCC37323P chip you listed is a dual 4 amp non-inverting AND inverting chip contained in one nice package

While the UCC37321P and the UCC37322P are 9 amp drivers, where the UCC37321P is the inverting version, and the UCC37322P is the non inverting.

So can I use just the UCC37322P on its own, this will be for switching MOSFET's (to reduce heating) that will be driving a flyback transformer and eventually I hope to make a tesla coil of some kind using them. Just though I would try them with a flyback first.

Steve Conner

Fri Jan 20 2012, 09:28PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

A common setup is one UCC37321 and one UCC37322. The inputs are connected together, and the gate drive transformer primary is connected between the outputs of the two chips. Since one output follows the input while the other does the opposite, this is a miniature H-bridge, and it gives plenty of drive voltage and current.

If at this point you're thinking "what is a gate drive transformer" see the HVWiki. Or use one of the IR21xx series high-side drivers, but be warned they're easier to destroy than a GDT-based setup.

Alex M

Fri Jan 20 2012, 10:20PM

Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552

Steve Conner wrote ...

A common setup is one UCC37321 and one UCC37322. The inputs are connected together, and the gate drive transformer primary is connected between the outputs of the two chips. Since one output follows the input while the other does the opposite, this is a miniature H-bridge, and it gives plenty of drive voltage and current.

If at this point you're thinking "what is a gate drive transformer" see the HVWiki. Or use one of the IR21xx series high-side drivers, but be warned they're easier to destroy than a GDT-based setup.

Thanks. Yes I know what I a gate drive transformer is thank's. This is one of the reasons I was looking into using gate drive chips as when I run my halfbridge based plasma speaker with audio being feed the MOSFET's run more linearly and thus heat up faster as the gate drive voltage changes depending on the frequency of the audio.

I have requested some UCC37321's from TI to go with the UCC37322's I have.

Alex.

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob