Patent ID: 6987378
Filing Date: 2006-01-17
Classification: H02M,Y02B

Abstract:
1. An over-voltage protection circuit of a power supply controller comprising: a control circuit coupled to receive a first PWM control signal and responsively form a first control signal operable to control a first transistor to control a output voltage and coupled to receive a second PWM control signal and responsively form a second control signal operable to control a second transistor to control the output voltage; the control circuit configured to block the first PWM control signal and the second PWM control signal responsively to an over-voltage value of the output voltage; the control circuit configured to assert the second control signal and negate the first control signal responsively to a first voltage value of the output voltage that is less than the over-voltage value; and the control circuit configured to negate the second control signal and negate the first control signal responsively to a second voltage value of the output voltage that is greater than the first voltage value and less than the over-voltage value.