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

Buck Converter Question.....

Status
Not open for further replies.
M

malli_1729

Full Member level 5
Joined
Feb 13, 2007
Messages
252
Helped
48
Reputation
96
Reaction score
46
Trophy points
1,308
Location
INDIA
Activity points
3,292
Hi!

This is regarding the switching buck regulator design. If we try to generate very less output voltage from very high input voltage (In Our case 1.2V from 12V Input using Buck).What are the consequences we can face may be w.r.t to efficiency or emissions,Stability and Load regulation.

As far as i know to generate very less voltage we need the Pulse width is very less(Switch mostly MOSFET will conduct very less time).ON time will be very less.

Any IDEA's will be very helpful....

thanks in advance.

malli
 

on time also depend on your switching frequency. lower frequency will have longer on time but bigger output ripple.
 

what will be the stability and efficiency will affect.....
 

Hi,
The problem with going to very low duty cycle on buck converter is that, the lower the duty cycle goes, the higher the peak current stress on the switch.

Hope this helps.
Tahmid.
 

The higher peak current problem can be overcome to a limit using higher frequency. but frequency cannot be pushed very high due to many reasons. It would be better to use an LDO after the buck converter at very low voltages.
 

in my opinion. for the efficiency, when you use synchronous mosfet, you need a much bigger low-side mosfet, or the efficiency will be low;
if you use the peak-current mode, u need a blanking time, so that means the frequency can't high enough.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top