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
Go to full version