PULSE WIDTH MODULATED CONTROLLER APPLIED TO SWITCH-TYPE VOLTAGE REGULATOR
First Claim
1. A pulse width modulated (PWM) controller applied to a switch-type voltage regulator, comprising:
- an error amplifier for receiving a reference voltage signal and a feedback voltage signal, and outputting an error current signal according to the received reference voltage signal and feedback voltage signal;
a soft-start control circuit for outputting a compensating current signal according to at least one soft-start control signal;
a compensating load for receiving the error current signal and the compensating current signal, and outputting a compensating signal according to the received error current signal and compensating current signal; and
a comparator for receiving a ramp signal and the compensating signal, and outputting a pulse width modulated (PWM) signal.
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Accused Products
Abstract
A PWM controller applied to switch-type voltage regulator includes an error amplifier, a soft-start control circuit, a compensating load and a comparator. The error amplifier receives a reference voltage signal and a feedback voltage signal and outputs an error current signal according to the received feedback voltage signal and the reference voltage signal. The soft-start control circuit outputs a compensating current signal according to at least one soft-start control signal. The compensating load receives the error current signal and the compensating current signal, and outputs a compensating signal. The comparator receives a ramp signal and the compensating signal, and outputs a pulse width modulated (PWM) signal. When a supply voltage rises, the error amplifier is compensated with a preset soft-start compensating current to a circuit common ground VSS, so that the error signal slowly rises during the soft-start control process. Therefore, the function of soft-starting is effectuated.
12 Citations
12 Claims
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1. A pulse width modulated (PWM) controller applied to a switch-type voltage regulator, comprising:
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an error amplifier for receiving a reference voltage signal and a feedback voltage signal, and outputting an error current signal according to the received reference voltage signal and feedback voltage signal; a soft-start control circuit for outputting a compensating current signal according to at least one soft-start control signal; a compensating load for receiving the error current signal and the compensating current signal, and outputting a compensating signal according to the received error current signal and compensating current signal; and a comparator for receiving a ramp signal and the compensating signal, and outputting a pulse width modulated (PWM) signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification