Circuit Device And Switching Power Supply Apparatus
AssigneeSeiko Epson Corporation
InventorShingo ARAI
Life of this patent
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Abstract
A circuit device includes a pre-driver that drives a gate of a first N-type MOS transistor provided between a power supply node and a switch node, and a bootstrap circuit that generates a boot voltage of the pre-driver from a power supply voltage. A boot capacitor is provided between the switch node and a boot node that supplies a boot voltage to the pre-driver. The bootstrap circuit includes a P-type MOS transistor provided between the power supply node and the boot node, and a Schottky barrier diode. The Schottky barrier diode has an anode coupled to the power supply node and a cathode coupled to the boot node.
Claims11
A circuit device that performs switching control of a first N-type MOS transistor of an output driver of a switching power supply apparatus that generates an output voltage from a power supply voltage, the circuit device comprising:
- a pre-driver that drives a gate of the first N-type MOS transistor provided between a power supply node to which the power supply voltage is supplied and a switch node;
- and
- a bootstrap circuit that generates a boot voltage of the pre-driver from the power supply voltage, wherein
- a boot capacitor is provided between the switch node and a boot node that supplies the boot voltage to the pre-driver, and
- the bootstrap circuit includes a P-type MOS transistor provided between the power supply node and the boot node, and a Schottky barrier diode having an anode coupled to the power supply node and a cathode coupled to the boot node.
Dependencies are inferred from the claim text.