Abstract: A voltage converting apparatus includes a first comparator, a second comparator, a constant on-time signal generator, a driving stage circuit, an inductor and a reference signal generator. The first comparator compares a feedback signal and a first reference signal to generate a first comparison result. The second comparator compares the first comparison result with a second reference signal to generate a second comparison result. The constant on-time signal generator generates a constant on-time signal. The reference signal generator generates the second reference signal with reducing voltage during a first time period according to an input voltage or a driving signal, and generates the second reference signal with rising voltage during a second time period according to a preset slope. The reference signal generator sets the first time period and the second time period according to the constant on-time signal.

Abstract: A voltage converting apparatus includes a first comparator, a second comparator, a constant on-time signal generator, a driving stage circuit, an inductor and a reference signal generator. The first comparator compares a feedback signal and a first reference signal to generate a first comparison result. The second comparator compares the first comparison result with a second reference signal to generate a second comparison result. The constant on-time signal generator generates a constant on-time signal. The reference signal generator generates the second reference signal with reducing voltage during a first time period according to an input voltage or a driving signal, and generates the second reference signal with rising voltage during a second time period according to a preset slope. The reference signal generator sets the first time period and the second time period according to the constant on-time signal.

Abstract: A control method for preventing an output voltage of a buck switching regulator from falling when an input voltage of the buck switching regulator falls includes: converting the input voltage into a charging current; determining a duty cycle of the buck switching regulator according to the charging current and the output voltage; and adjusting a switching frequency of a pulse width modulation signal in the buck switching regulator when the input voltage falls to a specific voltage and an off time of the pulse width modulation signal reaches a minimum value, in order to change the duty cycle to prevent the output voltage from falling.

Abstract: The present invention discloses a current balance circuit for a multiphase DC-DC converter. The current balance circuit comprises a current error calculation circuit, for generating a plurality of current balance signals indicating imbalance levels of a plurality of inductor currents of a plurality of channels of the multiphase DC-DC converter according to a plurality of current sensing signals of the plurality of channels, a time shift circuit, for adjusting pulse widths of a plurality of clock signals according to the plurality of current balance signals, and a ramp generator, for deciding shift levels of a plurality of ramp signals according to the plurality of clock signals.

Abstract: A control method for preventing an output voltage of a buck switching regulator from falling when an input voltage of the buck switching regulator falls includes: converting the input voltage into a charging current; determining a duty cycle of the buck switching regulator according to the charging current and the output voltage; and adjusting a switching frequency of a pulse width modulation signal in the buck switching regulator when the input voltage falls to a specific voltage and an off time of the pulse width modulation signal reaches a minimum value, in order to change the duty cycle to prevent the output voltage from falling.

Abstract: A switching regulator includes a lower gate switch and a transient help module. The lower gate switch is utilized for turning on and turning off according to a lower gate control signal. The transient help module includes a load detecting unit, for outputting a detecting signal according to a variation of a load, and a logic circuit, for generating the lower gate control signal according to the detecting signal, to turn off the lower gate switch when the load decreases.

Abstract: The present invention discloses a current balance circuit for a multiphase DC-DC converter. The current balance circuit comprises a current error calculation circuit, for generating a plurality of current balance signals indicating imbalance levels of a plurality of inductor currents of a plurality of channels of the multiphase DC-DC converter according to a plurality of current sensing signals of the plurality of channels, a time shift circuit, for adjusting pulse widths of a plurality of clock signals according to the plurality of current balance signals, and a ramp generator, for deciding shift levels of a plurality of ramp signals according to the plurality of clock signals.

Abstract: A duty cycle generator for generating a duty cycle signal to a power converter is disclosed. The duty cycle generator includes a first inverter, a second inverter, a signal protection unit including an input terminal coupled to the duty cycle signal for generating a break pulse to generate a protected duty cycle signal, a comparator for comparing a triangle-wave signal with a comparison signal to generate a comparison result, a NOR gate for generating a reset signal according to the comparison result and the protected duty cycle signal, an SR-latch for outputting a turn-on signal according to the clock signal and the reset signal, and an AND gate for generating the duty cycle signal according to the inverted clock signal and the turn-on signal.

Abstract: A duty cycle generator for generating a duty cycle signal to a power converter is disclosed. The duty cycle generator includes a first inverter, a second inverter, a signal protection unit including an input terminal coupled to the duty cycle signal for generating a break pulse to generate a protected duty cycle signal, a comparator for comparing a triangle-wave signal with a comparison signal to generate a comparison result, a NOR gate for generating a reset signal according to the comparison result and the protected duty cycle signal, an SR-latch for outputting a turn-on signal according to the clock signal and the reset signal, and an AND gate for generating the duty cycle signal according to the inverted clock signal and the turn-on signal.

Abstract: A switching regulator for fixing a frequency which includes a power stage circuit, comprising an upper gate switch, a lower gate switch and an inductor; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant frequency compensating circuit for a control signal according to the comparing result, a phase signal and a compensating signal. The constant frequency compensating circuit comprises a charging capacitor. The phase signal corresponding to the cross voltage of the lower gate bridge, and the compensating signal corresponding to the output voltage, and the constant frequency compensating circuit utilizes the phase signal to initialize a voltage of a terminal of the charging capacitor.

Abstract: The prevent invention provides a switching regulator with a constant on-time structure. The switching regulator includes power stage circuit, for outputting an output voltage to a load according to a control signal, and a constant on-time module, coupled with the power stage circuit, for adjusting off-time of the control signal according to a resistance of the load.

Abstract: A switching regulator for fixing a frequency which includes a power stage circuit, for receiving an input voltage and outputting an output voltage according to an control signal; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant-time trigger circuit for outputting the control signal according to the comparing result and a compensating signal; an a frequency compensator for outputting the compensating signal according to the output voltage and a phase signal; wherein the phase signal is corresponding to the magnitude of the voltage across the lower gate switch of the power stage circuit.

Abstract: A switching regulator for fixing a frequency which includes a power stage circuit, comprising an upper gate switch, a lower gate switch and an inductor; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant frequency compensating circuit for a control signal according to the comparing result, a phase signal and a compensating signal. The constant frequency compensating circuit comprises a charging capacitor. The phase signal corresponding to the cross voltage of the lower gate bridge, and the compensating signal corresponding to the output voltage, and the constant frequency compensating circuit utilizes the phase signal to initialize a voltage of a terminal of the charging capacitor.

Abstract: A switching regulator for fixing a frequency which includes a power stage circuit, for receiving an input voltage and outputting an output voltage according to an control signal; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant-time trigger circuit for outputting the control signal according to the comparing result and a compensating signal; an a frequency compensator for outputting the compensating signal according to the output voltage and a phase signal; wherein the phase signal is corresponding to the magnitude of the voltage across the lower gate switch of the power stage circuit.