Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

problem about high voltage switch

Status
Not open for further replies.

nksunmoon

Junior Member level 2
Joined
Sep 8, 2009
Messages
24
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,462
here is the problem:
I want to use MOSFETs to transfer a voltage ranging from 0V to 80V like a switch. The MOSFETs provided by the PDK can endure 80V Vds at most, but can only endure 5V Vgs at most.
The threshold is about 1.2V. So, how can I use the MOSFETs like this to form a switch to transfer a signal whose voltage ranges from 0V to 80V?

I need the help.
Thank you very much!
 

if you have 80v rated fets that will see 80v in the circuit then that isn't really enough derating. You should pick higher voltage fets, eg100v, but see what the peak transient ring (if any) is across the fets when they switch.
 

if you have 80v rated fets that will see 80v in the circuit then that isn't really enough derating. You should pick higher voltage fets, eg100v, but see what the peak transient ring (if any) is across the fets when they switch.

if I want to transfer a voltage ranging from 0V to 50V, how should I do?
 

a schematic would be needed, are you transferring it into a cap?...if so , mind out for inrush current.
This is some sort of high voltage signalling thing for noisy environments?
 

With the load use the bootstrapped triggering scheme. Use IR2110 and put connect the gate to the HO and put some minimal load to get start working.

Or use a optocouplerised firing scheme with a individual power supply.
IR2110+-+4.png

In this scheme connect the 0V to 80V signal input instead of 300V line and connect a load in OUT pin.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top