Switched-mode power supply
AssigneeRealtek Semiconductor Corp.
InventorsChen-Chih Huang, Cheng-Pang Chan
Life of this patent
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Abstract
A switched-mode power supply (SMPS) uses an equivalent inductor of bonding wire(s) and lead frame(s) to replace a traditional external inductor. A current-controlled pulse width modulation (PWM) modulator and a current-controlled pulse frequency modulation (PFM) modulator are optionally employed for high frequency switching, so as to mate a low inductance value of the bonding wire(s) and lead frame(s) and achieve reduced cost, low power consumption and low complexity.
Claims38
A switched-mode power supply (SMPS) for supplying an output current to charge an external capacitor to generate an output voltage, comprising:
- a first bonding wire;
- a second bonding wire;
- and
- a power conversion chip, comprising:
- a first pad connected to an end of the first bonding wire;
- a second pad connected to an end of the second bonding wire;
- a frequency compensation circuit coupled to the second pad to acquire a feedback voltage, and outputting an error signal according to a reference voltage and the feedback voltage;
- a current-controlled pulse width modulation (PWM) modulator electrically coupled to the frequency compensation circuit, generating a high-frequency PWM output signal according to the error signal and a high-frequency clock signal;
- a current-controlled pulse frequency modulation (PFM) modulator electrically coupled to the frequency compensation circuit, generating a high-frequency PFM output signal according to the error signal;
- a power stage, switching under control to output the output current from a switch node, the switch node connected to the first pad;
- a selector electrically coupled to the current-controlled PWM modulator, and the current-controlled PFM modulator, activating the current-controlled PWM modulator or the current-controlled PFM modulator according to a selection signal;
- and
- a driver electrically coupled to the power stage, the current-controlled PWM modulator and the current-controlled PFM modulator, controlling the switching of the power stage according to the PWM output signal or the PFM output signal;
- wherein the first bonding wire is electrically coupled to the other end of the second bonding wire, and electrically connected to an end of the external capacitor.
A switched-mode power supply (SPMS) for supplying an output current to charge an external capacitor to generate an output voltage, and comprising:
- a first bonding wire;
- a second bonding wire;
- and
- a power conversion chip, comprising:
- a first pad, connected to an end of the first bonding wire;
- a second pad, connected to an end of the second bonding wire;
- a frequency compensation circuit, electrically coupling to the second pad to acquire a feedback voltage, and outputting an error signal according to a reference voltage and the feedback voltage;
- a current-controlled pulse width modulation (PWM) modulator electrically coupled to the frequency compensation circuit, generating a high-frequency PWM output signal according to a high-frequency clock signal and the error signal;
- a power stage switching under control to output the output current from a switch node connected to the first pad;
- and
- a driver electrically coupled to the power stage and the current-controlled PWM modulator, controlling the switching of the power stage according to the PWM output signal;
- wherein the first bonding wire is electrically coupled to the other end of the second bonding wire, and electrically connected to an end of the external capacitor.
A switched-mode power supply (SMPS) for supplying an output current to charge an external capacitor to generate an output voltage, and comprising:
- a first bonding wire;
- a second bonding wire;
- and
- a power conversion chip, comprising:
- a first pad, connected to an end of the first bonding wire;
- a second pad, connected to an end of the second bonding wire;
- a frequency compensation circuit, electrically coupling to the second pad to acquires a feedback voltage, and outputting an error signal according to a reference voltage and the feedback voltage;
- a current-controlled pulse frequency modulation (PFM) modulator electrically coupled to the frequency compensation circuit, generating a high-frequency PFM output signal according to the error signal;
- a power stage, switching under control to output the output current from a switch node connected to the first pad;
- and
- a driver electrically coupled to the power stage and the current-controlled PFM modulator, controlling the switching of the power stage according to the PFM output signal;
- wherein the first bonding wire is electrically coupled to the other end of the second bonding wire, and electrically connected to an end of the external capacitor.
Dependencies are inferred from the claim text.