Nchannel Totem pole?

Mosaic

Well-Known Member

• Jul 3, 2011

• #1

Can a totem pole using only a pair of Nchannel mosfets be workable?

I guess reversing the Source & Drain as necessary?

Thanks!

 

crutschow

Well-Known Member

Most Helpful Member

• Jul 4, 2011

• #2

You can make an N-MOSFET totem pole but the upper transistor must be driven by a voltage higher than it's drain voltage to properly turn on. That's typically 10V above the drain voltage for standard MOSFETs and 5V for logic-level type MOSFETs.

You do not reverse the source and drain.

 

S

shortbus=

Well-Known Member

Most Helpful Member

• Jul 4, 2011

• #3

Using a half-bridge driver will make your life easier doing this. A half-bridge diver is half of what is needed for a H-bridge.
Here is a quick Google link to get you started; https://www.google.com/search?q=hal...ox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GWYE

 

Mosaic

Well-Known Member

• Jul 4, 2011

• #4

Do these half bridges exist in array form....perhaps 8 totems matched to an 8 bit port?

 

Mosaic

Well-Known Member

• Jul 5, 2011

• #5

Anyone?

 

ronv

Well-Known Member

Most Helpful Member

• Jul 5, 2011

• #6

Maybe you could tell us what you are trying to do? If your not hung up on N mos TTL logic has totem pole outputs and you can get several in an IC.

 

Mosaic

Well-Known Member

• Jul 5, 2011

• #7

Well I have an app driven by 5V PIC MCu and I need to drive light (<2A) inductive loads in the 12-15VDC range with reversible polarity. I'd like a soln to be sized to the 8 bit MCU ports. Thus the half H bridge or totem pole soln.

 

ronv

Well-Known Member

Most Helpful Member

• Jul 5, 2011

• #8

Here is a nice 3 amp one.

https://www.electro-tech-online.com/custompdfs/2011/07/LMD18201.pdf

If your closer to 1 amp try the 75410.

 

Mosaic

Well-Known Member

• Jul 6, 2011

• #9

I guess a multiport soln isn't common. I need to get several H bridges.

 

Mosaic

Well-Known Member

• Jul 6, 2011

• #10

Ok ..dug up this 1:
https://www.newark.com/texas-instru...hedProduct=sn754410&whydiditmatch=rel_default

 

ronv

Well-Known Member

Most Helpful Member

• Jul 6, 2011

• #11

It's one amp, but you get 2 full bridges per package.