JohnJohn20
Advanced Member level 4
Hi guys. I am sure this question has been asked before but when I search I get so many answers that don't really apply so I am confused.
I have a 20V PSU which I want to power a 3 phase permanent magnet motor (brushless motor I guess).
If I could, I would like to use 6 of TK40E06N1 (S N-channel MOSFET, 60 A, 60 V) for the high side and the low side switches of the H bridge.
- Would I need to use a bootstrap capacitor driver?
- If so, would I need a higher voltage than 20V to power the driver?
My second option is to use IRF5305PBF P-channel MOSFET (31 A, 55 V) for the high side switching and the TK40E06N1 for the low side.
- I would then have a positive 18V regulator (L7818) and a negative regulator for the MOSFET gates
- MOSFET Vgs(max) is 20V. I think 18V will charge the gates very quickly. Is 18V too close to Vgs(max)?
- Most of the driving circuits I have seen use a resistor (1KΩ to 10KΩ) between the MOSFET gate and source to discharge the gate and a transistor to charge it up. I feel this might be a bit slow. I want to switch the motor poles at 40kHz.
- Can someone suggest a suitable driver chip to use in this case?
- Or will I need to build one using 2 transistors for each MOSFET?
Any guidance would be appreciated. Thanks.
I have a 20V PSU which I want to power a 3 phase permanent magnet motor (brushless motor I guess).
If I could, I would like to use 6 of TK40E06N1 (S N-channel MOSFET, 60 A, 60 V) for the high side and the low side switches of the H bridge.
- Would I need to use a bootstrap capacitor driver?
- If so, would I need a higher voltage than 20V to power the driver?
My second option is to use IRF5305PBF P-channel MOSFET (31 A, 55 V) for the high side switching and the TK40E06N1 for the low side.
- I would then have a positive 18V regulator (L7818) and a negative regulator for the MOSFET gates
- MOSFET Vgs(max) is 20V. I think 18V will charge the gates very quickly. Is 18V too close to Vgs(max)?
- Most of the driving circuits I have seen use a resistor (1KΩ to 10KΩ) between the MOSFET gate and source to discharge the gate and a transistor to charge it up. I feel this might be a bit slow. I want to switch the motor poles at 40kHz.
- Can someone suggest a suitable driver chip to use in this case?
- Or will I need to build one using 2 transistors for each MOSFET?
Any guidance would be appreciated. Thanks.