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NPN & PNP matched pairs at 10A

Catwell
This is a major issue I've been having lately. I am designing H-Bridges for stepper motors. And at low amperage, 2A -5A, matching resistance of the NPN and PNP Mosfets is easy, having a perfectly balance bridge. But when you get into the 10A range, that is where the matching ends. What I find is that almost always the PNP has a higher resistance than the NPN.
 
I know there are ICs that are complete H-bridges, but I haven't found any that can handle 10A or more. So, I am going to stick with building the bridge from individual Mosfet.
 
With that being said, where can I find impedance matched NPN and PNP pairs that can handle 10A or more? Any help would be greatly appreciated.
 
Cabe
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  • 0 in reply to Former Member

    PNP/NPN doesn't mean Mosfet N or P channel, but means NPN BJT and PNP BJT there are many difference in between.

    Well balanced bridge it's necessary in order to balance the power dissipation on those devices.

     

    I believe you have to use a complementary devices, just like used in audio power amplifier.

    I will check on one of my audio amplifier built many years ago, if I remember well the power BJT were MJE series.

     

     

    Regards

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