FET driver not working..why?

For schematic,see the PDF at

On a sunny day (Sat, 03 Nov 2012 22:04:40 -0800) it happened Robert Baer wrote in :

Well, you build a switch! Its a source follower!

Does this driver need to HV bias to that drive circuit?

is

RT

ix

you made a wrong connection, +12V should not be connected to pin8 on the ir2118

gate drive voltage is on 0.47u charged via the diode when the fet is off

-Lasse

Also the bootstrap diode is recommended to be ultra-fast recovery-- a

Best regards, Spehro Pefhany

You need to move the 12V connection from VB to VCC, and also connect a bootstrap capacitor between VB and VS, on the order of 10x Cin, and as mentioned use fast recovery diode between the VB-VCC.

and looking at again, the +12V need to be connected to Vcc, and the

must have been going a little too fast ;)

-Lasse

Nice, that link totally shut down my FF when I clicked in the PDF link..

Shut it down with no notice and when I restarted it, all it did was restore my other tab and had the audacity to not even apologies for it!

Oh well.

Jamie

On a sunny day (Sun, 04 Nov 2012 14:05:15 -0500) it happened Jamie wrote in :

Worked OK here 3 times. (I reloaded the pdf after every reply).

Wow! You're even more incompetent than I imagined.

Let us know if it works OK.

Depending on the "Load", I don't think this will work too well with a load that is high impedance if the load node doesn't pull down low enough to charge the bootstrap cap.

boB

No asshole, the link was block via my ISP when Acrobat tried to load it. You are a total imbecile, one that really does not know what f*ck they are talking about and likes shaving their own foot in their month

I hope you like eating s*it, because it appears that you walk in it all day, and after putting your foot in your mouth like you do, often, it must not be too tasty by now..

what a winner of a child your mother had.. You must of been the drippings from the sheet on that one knight out she couldn't remember.

Jamie

Good point. It expects to be actively or passively pulled down within a couple volts of ground during the 'off' times.

Best regards, Spehro Pefhany

What else do you expect from Maynard?

The irony! Maynard is trying to act superior, when he was expelled from school in the first grade & never went back.

Isn't Jamie one of Larkin's pimps? ...Jim Thompson

You are obsessed with prostitution and impotence. Curious.

No one claims Maynard.

Larkin claims every pimp he can get. Otherwise he'd have no friends

...Jim Thompson

You are probably incorrect, but the wiring is directly from the data sheet.