Patent ID: 8611118

Claim:
A driver circuit for driving a control terminal of a transistor, the driver circuit comprising: a first driver output operative to selectively provide a drive signal to a control terminal of a transistor; a second driver output coupleable to a second terminal of the transistor; a driver transformer comprising: a core, a primary winding wound on the core, and a secondary winding wound on the core having a first end and a second end coupled with the second driver output; a pulse width modulation (PWM) controller comprising: a PWM output, and a control input; a first capacitor coupled between a first end of the primary winding of the driver transformer and the PWM output; a second capacitor coupled between the first end of the secondary winding of the driver transformer and the first driver output; a first rectifier coupled between the first driver output and the second driver output; and a limiting circuit, comprising: a limiting circuit input coupled with the PWM output, and a limiting control output coupled with the PWM controller, the limiting control output providing a limiting control signal to the control input to limit an on-time of the PWM output to be at or below an on-time threshold value.