T
treez
Guest
Hello,
The following sepic led driver regulates its own input current.
https://i46.tinypic.com/jttquc.jpg
spec:
vin= 5 to 8v
vout = 5 to 40v
pout = 1 to 5w
has overvoltage protection.
Coupled sepic inductor.
F(sw) = 30KHz - 125KHz
Its peak current mode, but the main negative feedback loop is closed around the input current.
Therefore, from a feedback loop point of view, this is not a sepic converter. It is much easier to stabilise than a sepic converter. -you can see that because it works stable even if the output capacitor is totally removed!
So you get all the advantages of a sepic (output short cct protection, and output voltage can be lower or higher than vin), but without having the feedback loop difficulty of a sepic
So can you confirm that the feedback loop equations for this converter are nothing like sepic converter feedback equations.?
The following sepic led driver regulates its own input current.
https://i46.tinypic.com/jttquc.jpg
spec:
vin= 5 to 8v
vout = 5 to 40v
pout = 1 to 5w
has overvoltage protection.
Coupled sepic inductor.
F(sw) = 30KHz - 125KHz
Its peak current mode, but the main negative feedback loop is closed around the input current.
Therefore, from a feedback loop point of view, this is not a sepic converter. It is much easier to stabilise than a sepic converter. -you can see that because it works stable even if the output capacitor is totally removed!
So you get all the advantages of a sepic (output short cct protection, and output voltage can be lower or higher than vin), but without having the feedback loop difficulty of a sepic
So can you confirm that the feedback loop equations for this converter are nothing like sepic converter feedback equations.?