Help with an h bridge controller

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Discussion Overview

The discussion revolves around the design of an H-bridge controller for an R/C car, specifically focusing on the use of p-type MOSFETs in place of n-type MOSFETs. Participants explore the implications of this choice on performance and the feasibility of implementing a PWM torque controller without voltage pump circuits.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant is using p-type MOSFETs for an H-bridge controller and questions the possibility of avoiding voltage pump circuits while still enabling PWM control.
  • Another participant seeks clarification on whether p-type MOSFETs are being used for low-side switches and expresses skepticism about their performance compared to n-type MOSFETs.
  • A later reply acknowledges the use of n-type MOSFETs for high-side switches and requests datasheets for both n-channel and p-channel devices being discussed.

Areas of Agreement / Disagreement

Participants express differing views on the performance of p-type versus n-type MOSFETs, indicating a lack of consensus on the best approach for the H-bridge design.

Contextual Notes

There are unresolved questions regarding the specific devices being used and their performance characteristics, as well as the implications of using p-type MOSFETs in this application.

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i'm using p type mosfets for an r/c cars h bridge controller (the two n types have been replaced with p types because of their lower internal resistance) and was wondering if there is a way to do it without voltage pump circuits that stills alllows a P.W.M. torque controller.
 
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So you're using p-type mosfets for the low-side switches as well?

EDIT -- I would have thought the n-fets would have better performance. What are the devices?
 
berkeman said:
So you're using p-type mosfets for the low-side switches as well?

EDIT -- I would have thought the n-fets would have better performance. What are the devices?

large 1:4 scale r/c car and use a LOT of current the difference in the internal resistance was becoming a problem in heating, and srry it was n types just i was typeing without thinking
 
Last edited:
Okay, so you want to use n-channel power MOSFETs for the high-side switches instead of p-channel. Hmmm, got to think about that one. Do you have a pointer to the n-channel device datasheets? And maybe one to the p-channel FETs that you are trying to replace.
 

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