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AN4149 Datasheet(PDF) 32 Page - STMicroelectronics |
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AN4149 Datasheet(HTML) 32 Page - STMicroelectronics |
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32 / 43 page  FOT PFC boost control loop AN4149 32/43 DocID023523 Rev 2 Equation 91 Looking at Figure 16, related to the gain and the phase of the control-to-output transfer function, it is possible to notice that it has just one pole at the origin. The gain falls with a slope -20 dB/dec and the phase shift is -90 ° at all frequencies. It can also be noted that the crossover frequency is much higher than the one required for a PFC (lower than 20 Hz). To make the gain roll off at low frequency (so as to cross the 0 dB axis at low frequency) and to boost the phase in the neighborhood of the crossover frequency (so as to increase phase margin), type II compensation is usually used, which adds a pole-zero couple. Figure 16. Bode plots of the control-to-output transfer function Figure 17. Schematic diagram of a type II compensation o r p S out m o C K k R V k G ⋅ + ⋅ ⋅ ⋅ ⋅ ⋅ = 2 1 2 η 7 . 955 200 2 27 . 0 1 11 . 0 400 92 . 0 2 23 . 0 = ⋅ ⋅ + ⋅ ⋅ Ω ⋅ ⋅ ⋅ = F k V G p o μ AM13316v1 AM13317v1 R1 R2 C2 C1 V OUT V COMP V ref |
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