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Do you know what are poles and zeros of the Error amplifier circuitry in SMPS?

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T

treez

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Hello,
Please could you identify the poles and zeros in this Flyback SMPS Error amplifier set-up, which uses TL431 and opto.? (schematic of SMPS, with TL431/Opto Error amplifier shown)

Basso book on page 292-295 identifies them for an error amplifier circuit that's almost exactly identical as this one , but there is no R4 or C3 in the Basso Error amplifier circuit
(ie R4 is shorted, and C3 not fitted)

LTspice sim of the overall smps (as the schematic) also attached
 

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  • Flyback _TL431_FLSL_type3.pdf
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  • Flyback _TL431_FLSL_type3.txt
    9.3 KB · Views: 34
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