公开(公告)号：US09049766B2

公开(公告)日：2015-06-02

申请号：US13921523

申请日：2013-06-19

Applicant: Richtek Technology Corporation

Inventor： Tsung-Wei Huang ,  Shui-Mu Lin ,  Huan-Chien Yang ,  Nang-Ching Yeung ,  Ti-Ti Liu

IPC: H05B37/02 ,  H05B39/04 ,  H05B41/36 ,  H05B33/08

CPC classification number: H05B33/0839 ,  H05B33/0815 ,  H05B33/0827 ,  Y02B20/347

Abstract: A LED driver using a PWM signal for dimming control includes a power converter and a current regulator. The power converter provides an output voltage and a load current for a plurality of LEDs. The current regulator provides a load current dependent signal for the power converter to speed up load transient response caused by variation of the load current, to reduce the ripple of the output voltage, and thereby to avoid audio noise during PWM dimming.

Abstract translation: 使用PWM信号进行调光控制的LED驱动器包括功率转换器和电流调节器。 功率转换器为多个LED提供输出电压和负载电流。 电流调节器为功率转换器提供负载电流相关信号，以加速由负载电流变化引起的负载瞬态响应，以减少输出电压的纹波，从而避免PWM调光期间的音频噪声。