Patent ID: 9232606
Filing Date: 2016-01-05
CPC Classification: H05B,Y02B

Claim Text:
1. A control circuit for a switch-mode power supply, the switch-mode power supply having an input terminal configured to receive an input signal and an output terminal configured to provide an output signal to a light-emitting device, wherein the switch-mode power supply comprising a first switch, the first switch is turned ON or OFF by a control signal, and wherein the control circuit comprising: an error amplifier, having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is configured to receive a dimming signal, the second input terminal is configured to receive a feedback signal, and the output terminal is configured to provide a compensation signal, and wherein the feedback signal is based on a current flowing through the light-emitting device; a minimum-off time control circuit, having an input terminal and an output terminal, wherein the input terminal is coupled to the output terminal of the error amplifier to receive the compensation signal, and the output terminal is configured to provide a minimum-off time control signal to adjust a minimum-off time period of the first switch based on the compensation signal; and a logic circuit, configured to provide the control signal based on the minimum-off time control signal.