Book is wrong about power stage transfer function for SMPS?

eem2am · 28th October 2011, 08:30 AM

Does any reader have the book "Switch Mode Power Supplies" by Christophe Basso?

Equation 2A-26, aong with parts 1 and 2 of the top of page 235 purports to give the control-to-output transfer function for DCM current mode flyback.

However, it is clearly wrong.

Equation 2A-26 doesnt even take into account the sense resistor.

...the parts 1 and 2 at top of page 235 are nonsense...........why do they tell what to do with the sense resistor and then not even use the sense resistor value in Equation 2A-26?

Do you agree that it is nonsense?

...and concerning parts 1 and 2 at the top of page 235..........why do they BOTH speak of current-mode.....what if its a voltage-mode flyback?...what is one supposed to do then?

Are you also in belief that this book is nonsense in this regard?

AndrewT · 28th October 2011, 08:34 AM

Am I allowed to make the comment "here we go again"?

eem2am · 28th October 2011, 08:51 AM

Yes you are,

.....more than that, if you can provide a list of (correct) control-to-output transfer functions for all the major SMPS topologies (including transformer isolated) in Voltage mode and current mode, and DCM as well as CCM......

....then you can publicly swear at me and i'll still pay you $150.

...and that would be money well spent.

28th October 2011, 08:30 AM	#1
eem2am diyAudio Member Join Date: Jun 2011	Book is wrong about power stage transfer function for SMPS? Does any reader have the book "Switch Mode Power Supplies" by Christophe Basso? Equation 2A-26, aong with parts 1 and 2 of the top of page 235 purports to give the control-to-output transfer function for DCM current mode flyback. However, it is clearly wrong. Equation 2A-26 doesnt even take into account the sense resistor. ...the parts 1 and 2 at top of page 235 are nonsense...........why do they tell what to do with the sense resistor and then not even use the sense resistor value in Equation 2A-26? Do you agree that it is nonsense? ...and concerning parts 1 and 2 at the top of page 235..........why do they BOTH speak of current-mode.....what if its a voltage-mode flyback?...what is one supposed to do then? Are you also in belief that this book is nonsense in this regard?

28th October 2011, 08:34 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Am I allowed to make the comment "here we go again"? __________________ regards Andrew T.

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28th October 2011, 08:51 AM	#3
eem2am diyAudio Member Join Date: Jun 2011	Yes you are, .....more than that, if you can provide a list of (correct) control-to-output transfer functions for all the major SMPS topologies (including transformer isolated) in Voltage mode and current mode, and DCM as well as CCM...... ....then you can publicly swear at me and i'll still pay you $150. ...and that would be money well spent.

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