| 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. |
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