Dc-dc converter control circuit
AssigneeGlobalFoundries U.S. Inc.
InventorShatabda Saha
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to semiconductor structures and, more particularly, to a dc-dc converter control circuit and methods of manufacture. The structure includes a dynamic pulse width modulation (PWM) circuit which converts a sense voltage to a variable current in response to a load current being above a predetermined threshold, and a ramp generator circuit which receives the variable current from the dynamic PWM circuit and dynamically adjusts a fixed base frequency of a PWM signal to a dynamic frequency of the PWM signal which corresponds with the load current.
Claims20
A structure comprising:
- a dynamic pulse width modulation (PWM) circuit which converts a sense voltage to a variable current in response to a load current being above a predetermined threshold, wherein the dynamic PWM circuit comprises a comparator that is enabled using an enable signal and the comparator outputs an enable variable current signal, the enable variable current signal and the converted sense voltage being utilized by a voltage-current converter to output the variable current;
- and
- a ramp generator circuit which receives the variable current from the dynamic PWM circuit and dynamically adjusts a fixed base frequency of a PWM signal to a dynamic frequency of the PWM signal corresponding with the load current.
A structure comprising:
- a dynamic pulse width modulation (PWM) frequency control circuit comprising a voltage-current converter which receives a load sensing voltage and converts the load sensing voltage to a variable current, and a load current sense circuit which receives a sense voltage and outputs the load sensing voltage, the dynamic PWM frequency control circuit further comprising a comparator that is enabled using an enable signal and outputs an enable variable current signal to the voltage-current converter;
- and
- a ramp generator circuit which receives the variable current from the dynamic PWM frequency control circuit and outputs a fixed base frequency in response to a load current being below a predetermined threshold, and dynamically adjusts the fixed base frequency of a PWM signal to a dynamic frequency of the PWM signal corresponding with the load current being above the predetermined threshold.
A method comprising:
- receiving an enable signal;
- determining that a load current is above a predetermined threshold;
- receiving the enable variable current signal and a sense voltage and converting the sense voltage and the enable variable current signal to a variable current in response to the load current being above the predetermined threshold, the enable variable current signal and the converted sense voltage being utilized by a voltage-current converter to output the variable current;
- and
- dynamically adjusting a fixed base frequency of a PWM signal to a dynamic frequency of the PWM signal based on the variable current corresponding to the load current.
Dependencies are inferred from the claim text.