cupoftea
Advanced Member level 5
Hi,
We have just done this 20W Offline Flyback. (90VAC input, 24vout and 0.8A out)
Transformer is np/ns = 84/19 and Lp = 1.07mH
Its in CCM at 90VAC.
TOPswitch-HX is voltage mode controller.
We used AN57 to give the Bode plots.
But they come out "nonsense" as the attached excel shows.
Do you think AN57 is incorrect?
We calculated Q as 1/R * SQRT(L/C)
where Cout = 1mF
L = sec coil L
AN57
Its in the top post here.,...
We have just done this 20W Offline Flyback. (90VAC input, 24vout and 0.8A out)
Transformer is np/ns = 84/19 and Lp = 1.07mH
Its in CCM at 90VAC.
TOPswitch-HX is voltage mode controller.
We used AN57 to give the Bode plots.
But they come out "nonsense" as the attached excel shows.
Do you think AN57 is incorrect?
We calculated Q as 1/R * SQRT(L/C)
where Cout = 1mF
L = sec coil L
AN57
Its in the top post here.,...
What is open loop gain of TL431
Hi, In the attached AN-57, do you know what is the "K(TL431)" value? (page 14).....the open loop gain of the TL431. We are trying to stabilise a 20W TOP256GN Flyback, and need to know the K(TL431) so we can calculate the feedback bodes. TL431...
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