How do I protect my circuit

Thread Starter

uzairali001

Joined Sep 8, 2015
8
Currently my circuit consist of 1 esp32, 3 n-channel mosfet, and a rgb led strip which draws approx 1.5 amps per channel. how can i make this circuit hazard proof if something went wrong. I'm thinking to place 1 resetable fuse between main +ve and 1 for each channel.
 

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danadak

Joined Mar 10, 2018
3,577
I would add a 50 - 100 ohm transistor in series UP to MOSFET gate
to limit gate charge current into UP rails and dampen any L effects
in gate charge path due to layout.

"Normally" you tune the actual value based on scope observation. You want
rise/fall time fast, but also want to limit Vss and Vdd current in UP not to violate
allowable port and pin current in UP specs. If you have a design that turns all
MOSFETS on at once that further compounds the issue. Limiting current is driven
by internal logic operation with reduced rail V due to current drop flowing thru
rail. Excess current can cause internal logic faults, erratic operation, outright
logic circuit failure.

Severe ringing -




https://toshiba.semicon-storage.com/info/docget.jsp?did=59456


Regards, Dana.
 
Last edited:

Thread Starter

uzairali001

Joined Sep 8, 2015
8
Whats limiting the current thru the LEDs ?


Regards, Dana.
Don't worry about LED it's LED strip so it take cares of resistors all it requires 12v dc. I'm more interested in circuit protection like what happen if it short circuit somehow or what if led draws more current then It requires (although it's not possible because led strip has resistors)
 
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