IR2117 implementation - simulation trouble

Thread Starter

HMartins

Joined May 10, 2011
23
Hi.

I can't figure why I am in trouble to implement IR2117. It just seems not to work no mater how simple the implementation is. I have done the simplest I could imagine, still, doesn't work. Of course it all started with bootstrap capacitor, etc, then I decided to isolate just this bit of as simple as possible circuit.

In the files:
http://alcachofra.net/IR2117-diagram.pdf
http://alcachofra.net/IR2117-spice.pdf

Your have the diagram and spice output image.

Can I have some help, please?

Thanks
H. Martins
 

kubeek

Joined Sep 20, 2005
5,724
I don´t think there is much help for this kind of behavior, the circuit should work flawlessly.
Where did you get the IR2117 model?
 

Jony130

Joined Feb 17, 2009
5,176
Well I think that your input signal DRAVE A is to low.
Your input signal is equal only to 5V, and your input gate is supply from 15V.
So I think you need at least 7.5V to IR2117 correct detected the high state at the input.
According to the data-sheet you need 9.5V min because of input gate hysteresis.
 

ifixit

Joined Nov 20, 2008
650
Hi HMartins,

Try a logic input of at least 10V. The voltage between Vs and Vb needs to be minimum 10V and maximum 20V.

Regards,
Ifixit
 

Thread Starter

HMartins

Joined May 10, 2011
23
You are right. I suppose I read something stating TTL level and I assumed hysteresis was within 5V. Most obvious problems are difficult to clear out:D.

I just resting adding a common emitter transistor to the out of the 74HC11 (in a page I didn't show) and it worked.

Any better way of doing this level convertion? Common emitter transistors tend to saturate and produce an on to off extra delay.

Of course I can use an opamp, but ... I suppose there are level shifters or converters I never used.

Thank you
Martins
 
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