what device can i used other than Zener diode for constant voltage and provide a path for excess current to ground

 

Welcomme to AAC, @AKSHAYMUKUND
The TL431 is effectively an adjustable zener. Two resistors set the voltage between 2.5V and 36V.

 

Welcome to AAC.

What is your application? That will influence the answer.

 

a path for excess current to ground

Are you talking a few mA excess, or many Amps? The shunt devices would be quite different.

 

Are you talking a few mA excess, or many Amps? The shunt devices would be quite different.

many amp

 

Hello,

Why do you want to dump current?
Would voltage regulator be in question?

Bertus

 

Welcome to AAC.

What is your application? That will influence the answer.

iot based project i need a 10v supply constant to make my LDO on . but whenever i increase the current nearly about 130amp then my zener is burn in that case i need same switching circuit that can provide a path for excess current

 

Show us a schematic of the circuit you are currently using and hopefully we can guide you from there.

 

Look in the TL431 datasheet.
https://www.ti.com/lit/ds/symlink/tl431.pdf?ts=1650513275848&ref_url=https%3A%2F%2Fwww.google.com%2F
There are lots of useful application circuits.
one of the examples is a high current shunt regulator.

 

? Can't see the schematic. Keep the file size <300k.

 

He is trying to shunt unused 130A (!) thru his little zener diode.
The input is probably a thousands of Watts from a lightning bolt and he wants to reduce it to 12V at 50mA.

 

How long will it have to shunt 130A?

 

Not very long if it is through a 1W Zener.

I suspect that he means 130 mA.

Bo

 

Show us a schematic of the circuit you are currently using and hopefully we can guide you from there.

How long will it have to shunt 130A?

yes nearly about 130-140A and then the Zener diode is burn I'm using up to 18w Zener diode still it happen i need some switching circuit in between capacitor and Zener like a switch have any idea about than

 

yes nearly about 130-140A

 

What are you doing that requires shunting 130 A ground?

Bob

 

What is your source voltage? The power you have to dissipate is 140A x (Source voltage - 10V)
One thing you WILL need is a heatsink, and it won't be a small heatsink.
Even if your source voltage is only 12V, you will still need to dissipate 280W, and that need a heatsink rated at 0.17°C/W, so you will probably also need a fan.

 

What is your source voltage? The power you have to dissipate is 140A x (Source voltage - 10V)
One thing you WILL need is a heatsink, and it won't be a small heatsink.
Even if your source voltage is only 12V, you will still need to dissipate 280W, and that need a heatsink rated at 0.17°C/W, so you will probably also need a fan.

ok I will try this thanks for the suggestion .what you think about mosfet as a switch in between capacitor and zener?

 

ok I will try this thanks for the suggestion .what you think about mosfet as a switch in between capacitor and zener?

See Fig. 31 of the datasheet I referenced in post #9.
You can use a MOSFET instead of the BJT, or you can use several devices in parallel.

 

See Fig. 31 of the datasheet I referenced in post #9.
You can use a MOSFET instead of the BJT, or you can use several devices in parallel.

ok i try this one thank you for your support if any problem occurred then i will get back to you