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.

Register Log in

voltage and current protection

Status
Not open for further replies.
U

ulaska

Member level 3
Joined
Aug 25, 2005
Messages
54
Helped
4
Reputation
8
Reaction score
0
Trophy points
1,286
Activity points
1,790
Hello,

i search but cant find what i want.

my circuit works with 12V and draws 0.18 A. and i want to use an ordinary 12V voltage adapter/regulator,
i want to protect my circuit from high voltage (>15V) and high current (>0.25A)

what can i use for this ? an IC or a protection circuit with few components ?

what do you suggest ?

thanks
 

As overvoltage protectionyou can use a zener dioda and SCR in the classic CROW-BAR configuration .. see picture below ..
As overcurrent protection you can use just simple slow-blow fuse (will also work with crow-bar), or, if you want to add more components, an electronic fuse ..
https://www.onsemi.com/PowerSolutions/product.do?id=NIS5112

Regards,
IanP
 

    U

    ulaska

    Points: 2
    Helpful Answer Positive Rating
Use transistor to Block excess current zener to Over volatge ...........
 

    U

    ulaska

    Points: 2
    Helpful Answer Positive Rating
is it a good idea to use LDO for regulation with 500mA?

**broken link removed**
 

The suggested LDO (LM2937) is also a good option for overvoltage and current protection, but you will need to ensure that the input voltage is ≈13Vdc (>12.5V) to provide good output regulation .. see picture below ..

Regards,
IanP
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top