Electronics > Beginners

Do dual mosfets max VDS doubled, in the back to back connection as a switch ?

(1/1)

BravoV:
With identical mosfets, does the maximum VDS doubled at the switched line ?

For e.g. each max breakdown VDS = 100V, with this configuration will it become 200V ?

Assuming the gate driver is fully isolated, like using photovoltaic MOSFET driver.

capt bullshot:
No, it does not.
One of the MOSFETs is reverse biased in this configuration, so its internal diode is conducting and pushing all the voltage drop to the other one.

BravoV:

--- Quote from: capt bullshot on December 19, 2018, 06:59:33 am ---No, it does not.
One of the MOSFETs is reverse biased in this configuration, so its internal diode is conducting and pushing all the voltage drop to the other one.

--- End quote ---

Ah, thanks, forgot the body diodes at both fets.  :palm:

So the max breakdown simply = (A single VDS) + (Single body diode VF) ?

Back to drawing board to find suitable MOSFETs.

capt bullshot:
Or even simpler just the single VDS, since the body diode VF usually is significantly lower than the breakdown voltage, especially as long as it isn't carrying current.

BravoV:
Yeah, noted, as the VF is minuscule compared to VDS, again, thanks.

Navigation

[0] Message Index

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod