An electronic device may include a main circuit including multiple sub-circuits powered by a direct-current (DC) power supply circuit. The main circuit has a main circuit current demand being a time-varying demand for a DC voltage-regulated supply current being a function of a number of the sub-circuits being active. The DC power supply circuit may include multiple DC voltage regulators to provide the main circuit with the supply current and a command decoding and power management circuit to control enablement of the voltage regulators. The command decoding and power management circuit may be configured to detect an instant value of the main circuit current demand and to selectively enable one or more of the voltage regulators based on the detected instant value.

A system includes an input voltage source, a linear regulator coupled to the input voltage source, and a load coupled to an output of the linear regulator. The linear regulator includes an error amplifier coupled to a control terminal of a switch; and a control circuit coupled to the error amplifier and configured to provide a reference voltage to the error amplifier. The control circuit includes a mode selection circuit with a slow loop configured to sample a load current and with a fast loop configured to detect an output voltage error signal. The mode selection circuit is configured to adjust a mode of the control circuit between a continuous power mode and a duty cycle power save mode based on the sampled load current and the output voltage error signal.

A system includes an input voltage source, a linear regulator coupled to the input voltage source, and a load coupled to an output of the linear regulator. The linear regulator includes an error amplifier coupled to a control terminal of a switch; and a control circuit coupled to the error amplifier and configured to provide a reference voltage to the error amplifier. The control circuit includes a mode selection circuit with a slow loop configured to sample a load current and with a fast loop configured to detect an output voltage error signal. The mode selection circuit is configured to adjust a mode of the control circuit between a continuous power mode and a duty cycle power save mode based on the sampled load current and the output voltage error signal.

Circuit comprising: a first switch (1S) having: a first side (FS) connected to an input node (IN); and a second side (SS); a first capacitor (FC) having: FS connected to SS of 1S; and SS; a second switch having: FS connected to SS of FC; and SS connected to a voltage level node; a third switch having: FS connected to SS of FC; and SS connected to a voltage output node; a fourth switch (4S) having: FS connected to IN; and SS; a second capacitor (SC) having: FS connected to SS of 4S; and SS; a fifth switch having: FS connected to SS of SC; and SS connected to the voltage level node; a sixth switch having: FS connected to SS of SC; and SS connected to the voltage output node; a first connection node connected to FS of FC; and a second connection node connected to FS of SC.

Circuit comprising: a first switch (1S) having: a first side (FS) connected to an input node (IN); and a second side (SS); a first capacitor (FC) having: FS connected to SS of 1S; and SS; a second switch having: FS connected to SS of FC; and SS connected to a voltage level node; a third switch having: FS connected to SS of FC; and SS connected to a voltage output node; a fourth switch (4S) having: FS connected to IN; and SS; a second capacitor (SC) having: FS connected to SS of 4S; and SS; a fifth switch having: FS connected to SS of SC; and SS connected to the voltage level node; a sixth switch having: FS connected to SS of SC; and SS connected to the voltage output node; a first connection node connected to FS of FC; and a second connection node connected to FS of SC.

A non-isolated power supply. A positive power and a negative power are respectively formed by charging a +VCC1 energy storage filter and a −VCC2 energy storage filter connected in series and discharging the +VCC1 energy storage filter 102 and the −VCC2 energy storage filter. The output positive and negative power may be differently combined by changing the capacities of the +VCC1 energy storage filter and the −VCC2 energy storage filter and may be equal or unequal.

An output buffer for a source driver of a panel includes an output stage, configured to output an output voltage; an operational transconductance amplifier (OTA), configured to control the output stage to charge or discharge a capacitor of a pixel of the panel; and a detector, coupled between the OTA and the output stage, configured to output an enabling signal to turn on/off the output buffer after the output buffer finishes charging or discharging the capacitor of the pixel of the panel, wherein the enabling signal is determined according to a current value of the output stage.

An output buffer for a source driver of a panel includes an output stage, configured to output an output voltage; an operational transconductance amplifier (OTA), configured to control the output stage to charge or discharge a capacitor of a pixel of the panel; and a detector, coupled between the OTA and the output stage, configured to output an enabling signal to turn on/off the output buffer after the output buffer finishes charging or discharging the capacitor of the pixel of the panel, wherein the enabling signal is determined according to a current value of the output stage.

Provided are: a power supply circuit capable of automatically changing a circuit configuration according to consumption current at a load to which power is supplied from a power supply line; and a method for controlling the power supply circuit. The power supply circuit includes: a plurality of Zener diodes (ZD) between which cascade connection is established and which are connected in parallel to a load (10) to which power is supplied from a power supply line; switches (SW) on which ON/OFF control is performed, which are connected in parallel to one of the plurality of Zener diodes or between the plurality of Zener diodes, and which form current paths when ON control is performed on the switches; a current monitoring means (2) for monitoring current that is flowing in one of the plurality of Zener diodes; a comparison means (4) for comparing a reference current (3) and the current monitored by the current monitoring means; and a control means (5) for performing ON/OFF control on the switches on the basis of the result of the comparison by the comparison means.

An electronic device may include a main circuit including multiple sub-circuits powered by a direct-current (DC) power supply circuit. The main circuit has a main circuit current demand being a time-varying demand for a DC voltage-regulated supply current being a function of a number of the sub-circuits being active. The DC power supply circuit may include multiple DC voltage regulators to provide the main circuit with the supply current and a command decoding and power management circuit to control enablement of the voltage regulators. The command decoding and power management circuit may be configured to detect an instant value of the main circuit current demand and to selectively enable one or more of the voltage regulators based on the detected instant value.