Overvoltage Protection

Status
Not open for further replies.
Z

zuirgham

Junior Member level 3
Joined
Mar 19, 2019
Messages
31
Helped
0
Reputation
0
Reaction score
1
Trophy points
8
Activity points
368
Vin = 9.2V - 9.8V. For the circuit mentioned in the figure, if Input Voltage crosses 10V , Zener gets activated.
For the given circuit, when zener is activated, will more current flow through the base of PNP and cause any trouble to the PNP transistor ? Or the circuit would do fine ?
 

Attachments

  • Capture.PNG
    9.8 KB · Views: 75

Provided you use the specified transistor it should be fine, its internal base resistor will limit the current to a safe level.

Brian.
 

You have no DC supply connection to the transistor emitter, so it won't work.
Click to expand...
Look again, the circuit is fine.

If you don't have one of those "digital transistors" with built-in base resistors, you need to add an external base resistor.
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…