OPERATING FREQUENCY CONTROL FOR LIGHT EMITTING ELEMENT DRIVING CIRCUIT

Abstract: a control circuit for a light emitting element driving circuit includes an analog dimming terminal and a driving terminal. the analog dimming terminal is configured to receive an analog dimming signal. the driving terminal is configured to provide a switching control signal having an operating frequency to a switching converter circuit. the switching converter circuit is configured to provide an output current to a light emitting element. the control circuit is configured to receive the analog dimming signal and to adjust the operating frequency of the switching control signal based on the analog dimming signal. the operating frequency when the analog dimming signal is at a first dimming reference is lower than the operating frequency when the analog dimming signal is at a second dimming reference. the first dimming reference is greater than the second diming reference.

Inventor(s): Zilin Fan

CPC Classification: H05B45/3725 (Switched mode power supply [SMPS])

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