Patent ID: 11936371
Assignee: PSEMI CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A gate control circuit for controlling the ON resistance, RON, of a power FET in a power converter, including:
(a) a source-follower circuit including a source-follower FET having a conduction channel configured to be coupled to the gate of the power FET, the gate control circuit configured to lower the RON of the power FET in a first ON state during normal power converter operation and to raise the RON of the power FET in a second ON state to restrict flow of current through the power FET; and
(b) a feedback circuit coupled to a gate of the source-follower FET and configured to generate a feedback current proportional to a current flow through the power FET and to regulate the RON of the power FET in the second ON state in proportion to the generated feedback current to provide a reduced gate-drive to the power FET.