boost converter duty cycle control
I think Hughes was trying to give you the transistor-level implementation of the error amplifier. And I think "brunch" referred to a "branch" and not the meal between breakfast and lunch
Getting back to business ... please take a look at the application note for the
UCC3570 here **broken link removed**
This is a low-power PWM chip and it has a dedicated pin for voltage feedforward called
VFWD. Voltage feedforward allows faster and more accurate response to input voltage variations. The actual input voltage is usually scaled down by using a resistive divider before connecting to this pin. Read the datasheet for more information on the IC and in particular this pin. This IC obviously has an Error Amp and you do put a compensation network around it but it had the feedforward pin as well so I thought that you would want to see the feedforward control in action in a real product!
For generic information, the Texas Instruments has archived many of their past seminars on power. These are generic topics and I think you will probably benefit by browsing and studying these documents which are stress the practical implementation of the dc/dc converters. The archive is here **broken link removed**
Look at the bottom of the page for the Unitrode Design Seminars (Unitrode was bought by TI some time ago). Click on the archive and see which topics interest you.
Below are some that I picked out for you but take a look around this and other sites -- especially search the application notes related to the integrated circuits that you are using (or are intending to use).
From 1984
Closing the Loop
https://focus.ti.com/lit/ml/slup068/slup068.pdf
Appendix A: Error Amplifier and Compensation Network Design
**broken link removed**
Appendix B: Bode Plots
https://focus.ti.com/lit/ml/slup070/slup070.pdf
From 1991
Control Loop Design
https://focus.ti.com/lit/ml/slup098/slup098.pdf
From 1996
Control Loop Cookbook
**broken link removed**
From 2001
An analytical comparison of Alternative Control Techniques
https://focus.ti.com/lit/ml/slup168/slup168.pdf
Designing Stable Control Loops
**broken link removed**
Best regards,
v_c