Review of the PWM Control Circuits for Power Converters

Two types of the conventional fixed-frequency pulse width modulated control circuits based on connection form are typically used, namely, voltage-mode control circuit and current-mode control circuit. For power converters of integrated circuit, it is commonly used with the current-mode control circuit instead of the voltage-mode control circuit, because the current-mode control circuit has a voltage feedback loop in addition to a current feedback loop, so it has faster transient response than the voltage-mode control circuit. This chapter will be compared between voltage-mode control circuit and current-mode control circuit. A well compensation design is the most important to increase the load transient response for switching converters of integrated circuit, so the different types of compensation design will also be given in this chapter.

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