Chapter 4

Flyback Converter with Current-Mode Control


Following a similar spirit as Chapter 2, peak current-mode control is elected to replace the voltage-mode implementation given in Chapter 3. Once again, the key step in this chapter lies in the derivation of the current-mode PWM gain. Once it is developed, all other procedures almost follow the same sequence as those of Chapter 2.


current loop
transfer function
gain margin
phase margin
loop gain
bilinear transform
digital filter

4.1. Current-mode schematic

To obtain peak current-mode control, the voltage-mode PWM in Figure 3.3 is replaced by a resistive current sensor Rs, a noninverting scaling amplifier (gain Ac), a comparator, and an RSFF (Figure 4.1).
Figure ...

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