Abstract: Power converter with voltage-selective skip mode entry. At least one example is a method of operating a power converter, the method comprising: operating, by a controller, the power converter in discontinuous conduction mode; and then operating, by the controller, the power converter in frequency foldback operation; and entering, by the controller, skip mode when load current falls below a skip threshold implemented based on an output voltage of the converter.

Abstract: Operation of a switching power converter, such as to reduce voltage spikes on the secondary side of switching power converters. One example is a method of operating a switching power converter, the method comprising: sensing, by a controller of a switching power converter, a strength-selection signal; and driving, by the controller within a plurality of switching cycles, a control input of a primary electrically-controlled switch, the driving in each switching cycle at a drive strength based on the strength-selection signal.

Abstract: Power converter with voltage-selective skip mode entry. At least one example is a method of operating a power converter, the method comprising: operating, by a controller, the power converter in discontinuous conduction mode; and then operating, by the controller, the power converter in frequency foldback operation; and entering, by the controller, skip mode when load current falls below a skip threshold implemented based on an output voltage of the converter.

Abstract: A switching power converter. Example methods include: switching a primary switch of the converter at a switching frequency, the converter having a feedback circuit acting as a low pass filter with a cutoff frequency, and each cycle of the switching frequency including a discharge mode and a charge mode that ends at a peak current through a primary winding of a transformer; generating, during the switching, a jitter signal having a shape and a jitter frequency; and ending a plurality of consecutive charge modes at a plurality of respective peak current values of current through the primary winding, the plurality of peak current values define an average value, and where peak current values higher than the average value define an envelope in the shape of the jitter signal, and peak current values lower than the average value define an envelope in the shape of the jitter signal that is inverted.

Abstract: A switched mode power supply controller includes a latch having an output for providing a drive signal, an off-time control circuit operating in valley switching and frequency reduction modes controlling an off-time of the latch based on at least a zero current detect signal, and an on-time control circuit resetting the latch in response to a current sense signal exceeding a feedback voltage representative of a load and to the current sense signal exceeding a modulated peak current threshold value. The on-time control circuit resets the latch in response to a current sense signal exceeding a feedback voltage representative of a load and to the current sense signal exceeding a peak current threshold value. In the frequency reduction mode, the on-time control circuit modulates the peak current threshold value by increasing the peak current threshold value by a predetermined amount.

Abstract: A switched mode power supply controller includes a latch having an output for providing a drive signal, an off-time control circuit operating in valley switching and frequency reduction modes controlling an off-time of the latch based on at least a zero current detect signal, and an on-time control circuit resetting the latch in response to a current sense signal exceeding a feedback voltage representative of a load and to the current sense signal exceeding a modulated peak current threshold value. The on-time control circuit resets the latch in response to a current sense signal exceeding a feedback voltage representative of a load and to the current sense signal exceeding a peak current threshold value. In the frequency reduction mode, the on-time control circuit modulates the peak current threshold value by increasing the peak current threshold value by a predetermined amount.

Abstract: Implementations of the present disclosure involve a circuit and/or method for a control circuit of a switched-mode power supply that allows the power supply circuit to temporarily provide up to 2.0× the nominal maximum power rating of the circuit without the need for large storage devices within the power supply. For example, a control circuit of a switched-mode power supply may cause the power supply to operate in a quasi-resonant mode. However, when the load on the circuit increases such that the feedback voltage measurement meets or exceeds a voltage threshold, the control circuit causes the switched-mode power supply to enter a power excursion mode with a fixed switching frequency. If the load on the switched-mode power supply continues to increase, the off time of the switched-mode power supply may be scaled in response to increase the power provided by the switched-mode power supply.

Abstract: Implementations of the present disclosure involve a circuit and/or method for a control circuit of a switched-mode power supply that allows the power supply circuit to temporarily provide up to 2.0× the nominal maximum power rating of the circuit without the need for large storage devices within the power supply. For example, a control circuit of a switched-mode power supply may cause the power supply to operate in a quasi-resonant mode. However, when the load on the circuit increases such that the feedback voltage measurement meets or exceeds a voltage threshold, the control circuit causes the switched-mode power supply to enter a power excursion mode with a fixed switching frequency. If the load on the switched-mode power supply continues to increase, the off time of the switched-mode power supply may be scaled in response to increase the power provided by the switched-mode power supply.

Abstract: Implementations of the present disclosure involve a circuit and/or method for a control circuit of a switched-mode power supply that allows the power supply circuit to temporarily provide up to 2.0× the nominal maximum power rating of the circuit without the need for large storage devices within the power supply. For example, a control circuit of a switched-mode power supply may cause the power supply to operate in a quasi-resonant mode. However, when the load on the circuit increases such that the feedback voltage measurement meets or exceeds a voltage threshold, the control circuit causes the switched-mode power supply to enter a power excursion mode with a fixed switching frequency. If the load on the switched-mode power supply continues to increase, the off time of the switched-mode power supply may be scaled in response to increase the power provided by the switched-mode power supply.

Abstract: Implementations of the present disclosure involve a circuit and/or method for a control circuit of a switched-mode power supply that allows the power supply circuit to temporarily provide up to 2.0× the nominal maximum power rating of the circuit without the need for large storage devices within the power supply. For example, a control circuit of a switched-mode power supply may cause the power supply to operate in a quasi-resonant mode. However, when the load on the circuit increases such that the feedback voltage measurement meets or exceeds a voltage threshold, the control circuit causes the switched-mode power supply to enter a power excursion mode with a fixed switching frequency. If the load on the switched-mode power supply continues to increase, the off time of the switched-mode power supply may be scaled in response to increase the power provided by the switched-mode power supply.

Abstract: An AC/DC input power converter including only a single input cable such that a user will never have to switch cabling, regardless if the cable is connected to an AC voltage source or a DC voltage source.

Abstract: An AC/DC input power converter including only a single input cable such that a user will never have to switch cabling, regardless if the cable is connected to an AC voltage source or a DC voltage source.