Electronics > Projects, Designs, and Technical Stuff
Best MOSFET Type for H-bridge
i_am_fubar:
So, there's a lot of MOSFET terminology that I'm a bit wooly on and I don't know how actually relevent it is to application.
Trench HEXFET
Power Trench
Enhancement
Depleation
...etc
Are there any rule of thumb application information for when to use what type?
Example, I'm building a small 5v 5A 3-phase motor driver. And am looking at the FDC8878 MOSFET.
It ticks most of the obvious boxed, 18m\$\Omega\$ RdsOn, Sub 50nS turn on/off, low nC for parasitics.
But I don't know if the Power Trench ness off it means it's good, bad or just a bit meh.
Cheers
fcb:
Enhancement/Depletion mode are types of FET's and define how they operate: https://en.wikipedia.org/wiki/Depletion_and_enhancement_modes
Trench HEXFET, Power Trench are trademarks of corporations that in-part refer to the construction of the MOSFET: https://en.wikipedia.org/wiki/Power_MOSFET
i_am_fubar:
So enhancment and depletion (in the case of MOSFETs) N and P type. huh, go figure it would be that easy :-+
fcb:
--- Quote from: i_am_fubar on February 13, 2020, 09:14:12 pm ---So enhancment and depletion (in the case of MOSFETs) N and P type. huh, go figure it would be that easy :-+
--- End quote ---
Nope.
It's to do with whether or not the FET is 'on' or 'off' with a zero g-s voltage.
Zero999:
--- Quote from: fcb on February 13, 2020, 09:52:52 pm ---
--- Quote from: i_am_fubar on February 13, 2020, 09:14:12 pm ---So enhancment and depletion (in the case of MOSFETs) N and P type. huh, go figure it would be that easy :-+
--- End quote ---
Nope.
It's to do with whether or not the FET is 'on' or 'off' with a zero g-s voltage.
--- End quote ---
To complicate matters it's possible to deplete enhancement mode MOSFETs and enhance depletion mode MOSFETs. Assuming N-channel devices, applying a negative gate voltage to an enhancement mode device can often reduce the leakage current, especially with low gate threshold types and applying a positive voltage to a depletion mode device, can further reduce the on resistance.
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