公开(公告)号：US20140312797A1

公开(公告)日：2014-10-23

申请号：US14158445

申请日：2014-01-17

Applicant: Cirrus Logic, Inc.

Inventor： Ramin ZANBAGHI ,  Arnab Kumar DUTTA ,  Firas AZRAI

IPC: H05B33/08

CPC classification number: H05B33/0872 ,  H02M7/5383 ,  H05B33/0815 ,  H05B33/0866 ,  Y02B20/347 ,  Y02B70/1441

Abstract: A self-oscillating resonator (SOR) may be used to control current through light emitting diodes (LEDs). The SOR may be started and stopped by a controller coupled to a transistor switch in the SOR. The controller may output a control signal that starts and stops the SOR by coupling a supply voltage or a ground to a base of the transistor switch in the SOR. Additional control over the current output to the LEDs may be gained through a resistive DAC coupled to the SOR and duty cycling the SOR.

Abstract translation: 自振荡谐振器（SOR）可用于控制通过发光二极管（LED）的电流。 SOR可以由耦合到SOR中的晶体管开关的控制器启动和停止。 控制器可以通过在SOR中将电源电压或接地耦合到晶体管开关的基极来输出启动和停止SOR的控制信号。 可以通过耦合到SOR的电阻式DAC和SOR负载来获得对LED的电流输出的额外控制。