Switching power supply device and semiconductor device
AssigneeRohm Co., Ltd.
InventorsShun FUKUSHIMA, Yosuke FUKUMOTO
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Abstract
A switching power supply device has a switching output stage generating an output voltage from an input voltage by switching operation and a controller controlling the switching output stage based on a feedback voltage commensurate with the output voltage. The switching power supply device can perform switching suspension control whereby it stops switching operation on detecting a light-load condition based on the feedback voltage, though it restarts switching operation on detection of an overvoltage condition during suspension of switching operation.
Claims16
A switching power supply device comprising:
- a switching output stage configured to generate an output voltage from an input voltage by switching operation;
- a controller configured to control the switching output stage based on a feedback voltage commensurate with the output voltage;
- a sleep determiner configured to be capable of outputting a suspension control signal based on the feedback voltage or based on a voltage of a signal generated based on the feedback voltage;
- and
- an overvoltage detector configured
- to check whether or not the output voltage is in an overvoltage condition based at least on the feedback voltage and
- to output an overvoltage detection signal when the output voltage is in the overvoltage condition,
- wherein
- the controller is configured
- to be capable of performing switching suspension control in which the controller suspends the switching operation on receiving the suspension control signal and
- to restart the switching operation on receiving the overvoltage detection signal while performing the switching suspension control.
A switching power supply device comprising:
- a switching output stage configured to generate an output voltage from an input voltage by switching operation;
- a first input terminal at which to receive a feedback voltage resulting from voltage division of the output voltage;
- a second input terminal at which to receive the output voltage;
- a controller configured to control the switching output stage based on a voltage at the first input terminal;
- and
- an overvoltage detector configured
- to check whether or not the output voltage is in an overvoltage condition based at least on the voltage at the second input terminal and
- to output an overvoltage detection signal when the output voltage is in the overvoltage condition,
- wherein
- a coil is provided between the switching output stage and a terminal to which the output voltage is applied, and
- the controller is configured
- to perform the switching operation in a manner that restricts a reverse current flowing from the coil to the switching output stage before receiving the overvoltage detection signal and
- to perform the switching operation in a manner that generates the reverse current on and after receiving the overvoltage detection signal.
Dependencies are inferred from the claim text.