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Transfer equation for optocoupler feedback in SMPS when R(LED) not connected to Vout?

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T

treez

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Hello,
Equn 3-58 on pg 290 of Basso's book (switch mode power supplies), gives the error amplifier transfer function for the case of R(LED) being connected to vout of the SMPS.....However, what is the error amplifier transfer function when the R(LED) is connected to a regulated and fixed bias voltage ?
(ie as in fig 3-41 of pg 294 of Basso's book)

Presumably its the same as equation 3-58 but with the "R(pullup)/R(LED)" term set to unity?
 

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