Revisited PWM driver for H Bridge

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DaHu_285096
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        I have been playing around with the PWM and dead band function and think I might have a solution for my 125 kHz modulated H-Bridge driver. The circuit is attached. Would there be any reason this would not work? Or, a more efficient way of doing it? Thanks   
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DaHu_285096
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        By the way, the invertors shown on external circuit are actually part of the MOSFET driver IC's and the MOSFETS are matched pairs in IC's, the invertors are shown to explain switching logic levels   
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Bob_Marlowe
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Can you guarantee that under all circumstances as power-up, initialization, reset and power down the PSoC outputs can not cause a shortcut in your bridge?

   

 

   

Bob

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ETRO_SSN583
Level 9
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An H Bridge datasheet shows worst case Ton, Toff delays under T, V conditions.

   

If it does not don't use it, it is incompletely characterized.

   

 

   

So those numbers + some margin designer feels comfortable with to cover layout

   

and any other issues become dead band settings. Many H bridge offerings even

   

include Safe Area, Thermal, and the actual timing circuits, so even dead band is

   

irrelevant from external PWM.

   

 

   

Regards, Dana.

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Anonymous
Not applicable

Hello,

   

i am trying too using PSOC 5 to produce two phase shift signals with dead band. I notice that you have the same problem. Could you help me if you had found the solution for this issue?

   

thanks

   

regards

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ETRO_SSN583
Level 9
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Just look at global properties and setup -

   

 

   

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ETRO_SSN583
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Another approach -

   

 

   

    

   

          http://www.cypress.com/?rID=73644

   

 

   

Regards, Dana.

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