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US 2019/0157965 A1Published application
Switch control circuit including multipin to set dead time information and/or protection mode
AssigneeSemiconductor Components Industries, LLC
InventorHang-Seok CHOI
Life of this patent
Estimating the term…
Abstract
A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. The first dead time information is information about a dead time of a first switch and a second switch controlling power supply, the second dead time information is information about a dead time for synchronous rectification, and the protection mode includes an auto-restart mode and a latch mode.
Claims20
A switch control circuit comprising:
- a first pin configured to be connected to a first voltage;
- a second pin to receive a multi-voltage generated using the first voltage;
- and
- an initialization unit configured to count an initialization period by using a count clock signal from a time at which the multi-voltage reaches an initialization voltage,
- wherein at least two of first dead time information, second dead time information, and a protection mode are set based on the multi-voltage, and
- wherein the first dead time information includes information about a dead time of a first switch and a second switch controlling a power supply,
- wherein the second dead time information includes information about a dead time for synchronous rectification.
4 more elements
A switch control circuit comprising:
- a first pin;
- a biasing circuit to produce a first voltage on the first pin;
- a second pin to receive a multi-voltage generated using the first voltage;
- a first comparator configured to generate a first comparison signal according to a comparison result of the multi-voltage and a first threshold voltage;
- a second comparator configured to generate a second comparison signal according to a comparison result of the multi-voltage and a second threshold voltage;
- and
- a second counter configured to be enabled based on the first comparison signal and to be reset based on the second comparison signal to count a first period,
- wherein at least two of first dead time information, second dead time information, and a protection mode are set based on a multi-voltage of the second pin, and
- wherein the first dead time information includes information about a dead time of a first switch and a second switch controlling a power supply,
- wherein the first dead time information is determined according to the count of the first period,
- wherein the second dead time information includes information about a dead time for synchronous rectification, and
- wherein modes the protection mode may be set to include an auto-restart mode and a latch mode.
9 more elements
A power supply device comprising:
- a first switch and a second switch configured to be connected in series between an input voltage and a primary side ground;
- a transformer configured to include a primary side wire connected between the input voltage and a node situated between the first switch and the second switch;
- a first synchronous rectification switch configured to rectify a current flowing through a first secondary side wire of the transformer;
- a second synchronous rectification switch configured to rectify a current flowing through a second secondary side wire of the transformer;
- a switch control circuit configured to include a first pin connected to a first voltage and a second pin and to set at least two of first dead time information, second dead time information, and a protection mode based on a multi-voltage of the second pin, the switch control circuit including a sink current source and a third switch, wherein the sink current source is connected in series to the third switch, and wherein the sink current source and third switch are connected in series between the second pin and a secondary side ground;
- a first resistor configured to be connected between the first pin and the second pin;
- a first capacitor configured to be connected to the second pin;
- and
- wherein the first dead time information includes information about a dead time of the first switch and the second switch, the second dead time information includes information about a dead time of the first synchronous rectification switch and the second synchronous rectification switch, and the protection mode includes an auto-restart mode and a latch mode.
6 more elements
Dependencies are inferred from the claim text.