Synchronous rectifier control circuit
AssigneeTexas Instruments Incorporated
InventorsBing LU, Bharath KANNAN
Life of this patent
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Abstract
A synchronous rectifier control circuit includes a drain voltage input, a first gate voltage output, a second gate voltage output, a gate voltage generation circuit, and a trigger control circuit. The gate voltage generation circuit includes a first input coupled to the drain voltage input, and an output coupled to the first gate voltage output. The trigger control circuit includes a first input coupled to the first gate voltage output, a second input coupled to the second gate voltage output, and an output coupled to a second input of the gate voltage generation circuit.
Claims20
A synchronous rectifier control circuit, comprising:
- a drain voltage input;
- a first gate voltage output;
- a second gate voltage output;
- a gate voltage generation circuit comprising:
- a first input coupled to the drain voltage input;
- a set-reset (SR) latch comprising an output coupled to the first gate voltage output;
- and
- a trigger control circuit comprising:
- a first input coupled to the first gate voltage output;
- a second input coupled to the second gate voltage output;
- and
- an output coupled to an input of the SR latch.
A synchronous rectifier control circuit, comprising:
- a first control channel configured to activate a first synchronous rectifier;
- a second control channel configured to activate a second synchronous rectifier;
- and
- a trigger control circuit configured to:
- activate a trigger control signal responsive to the first control channel activating the first synchronous rectifier;
- and
- deactivate the trigger control signal responsive to the second control channel activating the second synchronous rectifier;
- and
- wherein the first control channel comprises a gate voltage generation circuit configured to generate a gate control signal for the first synchronous rectifier based on a drain voltage of the first synchronous rectifier, and the trigger control signal generated by the trigger control circuit.
A switch-mode power supply, comprising:
- a transformer;
- a first synchronous rectifier coupled to a secondary winding of the transformer;
- a second synchronous rectifier coupled to the secondary winding of the transformer;
- a synchronous rectifier control circuit coupled to the first synchronous rectifier and the second synchronous rectifier, and comprising:
- a drain voltage input coupled to a drain terminal of the first synchronous rectifier;
- a first gate voltage output coupled to a gate terminal of the first synchronous rectifier;
- a second gate voltage output coupled to a gate terminal of the second synchronous rectifier;
- a gate voltage generation circuit comprising:
- a first input coupled to the drain voltage input;
- and
- an output coupled to the first gate voltage output;
- and
- a trigger control circuit comprising:
- a first input coupled to the first gate voltage output;
- a second input coupled to the second gate voltage output;
- and
- an output coupled to a second input of the gate voltage generation circuit.
Dependencies are inferred from the claim text.