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US 12,683,505 B2Granted
Pulse width modulation circuit configured to control a power transistor of a switched-mode power supply
AssigneeSTMicroelectronics International N.V.
InventorsLionel Esteve, Loic Bourguine
Life of this patent
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Abstract
The present disclosure relates to a pulse width modulation circuit of a switched-mode power supply formed in and on a monolithic semiconductor substrate with a face coated with a gallium nitride layer, said circuit being adapted to control a power transistor of said switched-mode power supply.
Claims19
A device, comprising:
- a switched-mode power supply;
- a pulse width modulation (PWM) control circuit in the switched-mode power supply, the PWM control circuit including:
- a first comparator circuit configured to receive a first voltage and to output a first result;
- and
- a second comparator circuit configured to receive the first voltage and to output a second result;
- a monolithic semiconductor substrate with a face coated with a gallium nitride layer, the PWM control circuit formed on the monolithic semiconductor substrate;
- and
- a power transistor, the PWM control circuit configured to control the power transistor, wherein the first voltage is representative of a drain current of the power transistor, the first result is configured to cause the power transistor to be non-conductive when the first voltage is higher than a first threshold voltage, and the second result is configured to cause the power transistor to be non-conductive when the first voltage is lower than a second threshold voltage.
5 more elements
A method, comprising:
- controlling a monolithic switched-mode power supply, by:
- detecting a feedback current constituting an image of an output voltage of the switched-mode power supply;
- generating a sensing voltage according to the feedback current;
- generating a first result by comparing the sensing voltage with a first reference voltage;
- generating a second result by comparing the sensing voltage with a second reference voltage;
- generating a third result by comparing the sensing voltage with a third reference voltage;
- combining the first, the second, and the third result by a logic circuit;
- driving a power transistor of the switched-mode power supply with the logic circuit;
- filtering the first result with a first filter circuit, the first filter circuit configure to allow the first result to be taken into account only during a non-conduction phase of the power transistor;
- and
- filtering the second result with a second filter circuit, the second filter circuit configure to allow the second result to be taken into account only during the non-conduction phase of the power transistor.
8 more elements
A device comprising:
- a power transistor having a drain terminal and a gate terminal;
- a monolithic structure including:
- a semiconductor substrate;
- and
- a gallium nitride layer;
- an output terminal coupled to the drain terminal of the power transistor;
- and
- a control circuit on the monolithic structure, the control circuit coupled to the gate terminal of the power transistor, the control circuit configured to switch on and off a current through the power transistor, the control circuit including:
- a logic circuit configured to switch on and off the current flow through the power transistor, the logic circuit including:
- a NOR gate having a plurality of inputs and an output;
- and
- an OR gate having a plurality of inputs and an output.
9 more elements
Dependencies are inferred from the claim text.