Light emitting diode load driving apparatus

摘要

An LED load driving apparatus including a power conversion circuit and a control chip is provided. The power conversion circuit receives an input voltage and drives an LED load in response to a PWM signal. The control chip includes a control core circuit and a memory unit. The control core circuit is operated under a system voltage to provide the PWM signal for controlling operation of the power conversion circuit. The control core circuit is inactivated during a power-off period and restarted during a power-on period. The memory unit is operated under the input voltage and is configured to: store a dimming operation data before the control core circuit is inactivated during the power-off period; and provide the stored dimming operation data during the power-on period to the control core circuit, so as to make the control core circuit perform corresponding dimming operation relating to the LED load.

主权项

1. A light emitting diode (LED) load driving apparatus, comprising:
a power conversion circuit configured to receive an input voltage and drive an LED load in response to a pulse width modulation signal; a control chip coupled to the power conversion circuit, wherein the control chip comprises:
a control core circuit operated under a system voltage to provide the pulse width modulation signal for controlling an operation of the power conversion circuit, wherein the control core circuit is inactivated during a power-off period and restarted during a power-on period; anda memory unit coupled to the control core circuit and operated under the input voltage, wherein the memory unit is configured to:
store a dimming operation data provided by the control core circuit and before the control core circuit is inactivated during the power-off period; andprovide the stored dimming operation data during the power-on period to the control core circuit so as to make the control core circuit perform a corresponding dimming operation relating to the LED load.