Abstract: A smart power stage (SPS) circuit of a power converter and a current monitoring circuit thereof are disclosed. The SPS circuit includes an output stage circuit and a driver. The output stage circuit receives an input voltage and the power converter provides an output voltage and an inductor current. The driver includes a driving circuit, a monitoring signal generation circuit and a compensation circuit. The driving circuit receives a PWM signal and provides a driving signal to the output stage circuit. The monitoring signal generation circuit receives the PWM signal, input voltage and output voltage for generating a monitoring signal related to the inductor current. The monitoring signal includes a simulated current signal. The compensation circuit is coupled to the monitoring signal generation circuit. When the simulated current signal is greater than a default value, the compensation circuit generates a compensation signal superposing to the simulated current signal.

Abstract: A smart power stage (SPS) circuit of a power converter and a current monitoring circuit thereof are disclosed. The SPS circuit includes an output stage circuit and a driver. The output stage circuit receives an input voltage and the power converter provides an output voltage and an inductor current. The driver includes a driving circuit, a monitoring signal generation circuit and a compensation circuit. The driving circuit receives a PWM signal and provides a driving signal to the output stage circuit. The monitoring signal generation circuit receives the PWM signal, input voltage and output voltage for generating a monitoring signal related to the inductor current. The monitoring signal includes a simulated current signal. The compensation circuit is coupled to the monitoring signal generation circuit. When the simulated current signal is greater than a default value, the compensation circuit generates a compensation signal superposing to the simulated current signal.

Abstract: A control circuit of a buck-boost converting apparatus is disclosed. The control circuit includes a current sensing circuit and a mode determination circuit. The current sensing circuit senses an output current of the buck-boost converting apparatus and provides a current sensing signal. The mode determination circuit is coupled to the current sensing circuit and receives the current sensing signal. The mode determination circuit generates a default voltage according to the current sensing signal and a default current, and the mode determination circuit generates a switching control signal according to the default voltage and the current sensing signal to control the buck-boost converting apparatus to be operated in a buck mode, a boost mode or a buck-boost mode.