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 controlled regulator

Status
Not open for further replies.
E

edaenrico

Member level 4
Joined
Apr 19, 2010
Messages
76
Helped
10
Reputation
20
Reaction score
10
Trophy points
1,288
Activity points
1,864
Hi,

I have to design a voltage regulator where the output voltage is controlled by an external analog voltage.

The output voltage of the regulator range: 0-12 Volt

The control voltage range: 0-3.3 Volt


I tried with an LM317 without success

Thanks,
Enrico Migliore
 

I would recommend, if you can stand a fairly poor frequency
response and have the headroom (you do not say about the
input voltage range, which is a key design parameter) a
single supply op amp driving the gate of a PMOSFET (if
VIN > 8V) or maybe a NPN Darlington (if you have an AUX
supply but VIN is lower) or NMOSFET (if AUX > 8V and
VINmin can be close to VOUTmax). Your output current
would be important to component selection as well.
 

Hi,

You can use almost any adjustable regulator, that work with a resistive divider from output to FB pin.
Just connect an extra resistor from your control voltage to the FB pin.

Then the output voltage is high when control voltage is low.

Klaus
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top