Maker Pro
Maker Pro

SMPS feedback loop is "easy"?

eem2am

Aug 3, 2009
429
Joined
Aug 3, 2009
Messages
429
Hello,

Please could you help to define what circuit elements are (and which are not) in the feedback control loop of this SEPIC LED driver…………….

http://i46.tinypic.com/jttquc.jpg

V(in) is fixed at 6V.

Input current is regulated by the loop.
Output voltage could be anything between 5V and 40V.
Input power is limited to 7W.

The converter is a SEPIC , but I believe that the actual converter topology could have been anything, and the control loop would not change…is this true?

I mean, the converter’s power stage and output capacitors simply are not in the feedback loop…do you agree?
The feedback loop simply involves the input capacitors..is this true?
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
I mean, the converter’s power stage and output capacitors simply are not in the feedback loop…do you agree?
The feedback loop simply involves the input capacitors..is this true?
Not much of a feedback loop if the output is not included.

Bob
 

eem2am

Aug 3, 2009
429
Joined
Aug 3, 2009
Messages
429
Not much of a feedback loop if the output is not included.

,,,the circuit regualtes the current drawn from a 6V battery...theres no need to regulate the output voltage or current......that just happens as a result that the input current is regulated.
 
Top