Self-limiting pulse width modulation regulator
17 Assignments
0 Petitions
Accused Products
Abstract
A self-adjusting PWM regulator which minimizes undershoot and overshoot conditions is disclosed. The regulator includes a charge pump, a voltage comparator circuit, and a latch circuit. The input of the voltage comparator circuit includes an output of the charge pump. The input of the latch circuit includes an output from the voltage comparator circuit. The latch circuit includes a pair of SR latches coupled to a pair of AND/OR gates. The latch circuit transmits a first signal to the charge pump to prevent an overshoot condition if the output from the voltage comparator circuit is in a first state, and transmits a second signal to prevent an undershoot condition if the output from the voltage comparator circuit is in a second state. This keeps the charge pump adjusted within the limits of its control.
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Citations
36 Claims
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1-24. -24. (canceled)
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25. A pulse width modulation regulator, comprising:
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a first controller, wherein the first controller receives as input a clock signal and a first control signal and outputs a first pulse width modulated signal;
a second controller, wherein the second controller receives as input an inverse of the clock signal and a second control signal and outputs a second pulse width modulated signal, wherein the first control signal maintains the second pulse width modulated signal at a first state when the first pulse width modulated signal has not increased to a desired pulse width, wherein the second control signal maintains the first pulse width modulated signal at a second state when the second pulse width modulated signal has not decreased to the desired pulse width; and
an OR gate for receiving as input the first and second pulse width modulated signals and for providing an output signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification