US 2020/0287465 A1 · SWITCHED-MODE POWER SUPPLY WITH FIXED ON-TIME CONTROL SCHEME

Abstract

Certain aspects of the present disclosure generally relate to a switch mode power supply (SMPS). The SMPS generally includes at least one switch, an inductive element coupled to the at least one switch, and control circuitry, the control circuitry being configured to control the at least one switch, during each switching cycle of a plurality switching cycles of the SMPS, to transfer charge from an input voltage (Vin) node of the SMPS to the inductive element during an on-time of the switching cycle and transfer the charge to an output voltage (Vout) node of the SMPS during an off-time of the switching cycle. The on-time may be set based on a duty ratio of the SMPS, the duty ratio representing a ratio between a voltage at the Vin node and a voltage at the Vout node, the on-time being fixed depending on the duty ratio of the SMPS.

Claims20

Dependent claims

A switched-mode power supply (SMPS), comprising:

at least one switch;
an inductive element coupled to the at least one switch;
and
control circuitry configured to:
control the at least one switch, during each switching cycle of a plurality switching cycles of the SMPS, to transfer charge from an input voltage (Vin) node of the SMPS to the inductive element during an on-time of the switching cycle and transfer the charge to an output voltage (Vout) node of the SMPS during an off-time of the switching cycle;
and
set the on-time of the switching cycle based on a duty ratio of the SMPS, the duty ratio representing a ratio between a voltage at the Vin node and a voltage at the Vout node, wherein the on-time of the switching cycle is fixed depending on the duty ratio of the SMPS, wherein the control circuitry is configured to set the on-time of the switching cycle such that the on-time remains fixed while the duty ratio of the SMPS remains constant.

4 more elements

A method for voltage regulation, comprising:

determining an on-time of a switching cycle of a switched-mode power supply (SMPS) based on a duty ratio of the SMPS, the duty ratio representing a ratio between a voltage at an input voltage (Vin) node of the SMPS and a voltage at an output voltage (Vout) node of the SMPS, wherein the on-time of the switching cycle is fixed depending on the duty ratio of the SMPS, wherein the on-time is determined such that the on-time of the switching cycle remains fixed while the duty ratio of the SMPS remains constant;
transferring charge from the Vin node of the SMPS to an inductive element of the SMPS during the on-time;
and
transferring the charge to the Vout node of the SMPS during an off-time of the switching cycle.

1 more element

An apparatus for voltage regulation, comprising:

means for determining an on-time of a switching cycle based on a duty ratio, the duty ratio representing a ratio between a voltage at an input voltage (Vin) node and a voltage at an output voltage (Vout) node, wherein the on-time of the switching cycle is fixed depending on the duty ratio of the SMPS, wherein the means for determining is configured to set the on-time of the switching cycle such that the on-time remains fixed while the duty ratio of the SMPS remains constant;
means for transferring charge from the Vin node to an inductive element during the on-time;
and
means for transferring the charge to the Vout node during an off-time of the switching cycle.

1 more element

Dependencies are inferred from the claim text.

Switched-mode power supply with fixed on-time control scheme

Life of this patent

Switched-mode power supply with fixed on-time control scheme

Life of this patent

Abstract

Claims20