MOSFET specs
OPTO specs
Then you will need ether the charge-pump driver approach, or the photo-voltaic opto-coupler, to generate a gate voltage greater than the supply voltage to fully turn on the top MOSFET, since it is operating as a source-follower, with the gate voltage needing to be greater then the source volage by more than the MOSFET Vgs(th) value.I would prefer to use both MOSFETs from the same kind, prefereably the N-type
Then you will need ether the charge-pump driver approach, or the photo-voltaic opto-coupler, to generate a gate voltage greater than the supply voltage to fully turn on the top MOSFET, since it is operating as a source-follower, with the gate voltage needing to be greater then the source volage by more than the MOSFET Vgs(th) value.
What opto-driver?since the opto-driver has no external power supply
Basically when on, the PVI behaves as a current source (Isc) so long as it's below its open circuit voltage (Voc). So basically dt=dQ/Isc.@all, the arrangement purposed on post #5, based on everyone's inputs, seems to solve the issue; I'm just curious to know if I took the correct approach to assess the switching time with the selected MOSFET+OPTO set. I would appreciate if someone could give some insight about the Calculation topic on that post.
Hi; This one: APV1111GVWhat opto-driver?
Thank you, this matches with the approach posed on post #5; the central point then was to check if it is correct and if there were any other boundary condition to be considered.The turn-on delay will be Qg(th)/Isc
The one selected do have this information. it lies within an acceptable range, 0,1ms.Turn off behavior depends greatly on the PVI you use. Many have fast turn-off circuitry, but the actual behavior of this is usually not documented well. But it's always faster than turn-on time. Best to investigate this with actual testing.
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