公开(公告)号：US09088204B2

公开(公告)日：2015-07-21

申请号：US13913050

申请日：2013-06-07

Applicant: Richtek Technology Corporation

Inventor： Li-Wen Fang ,  Ping-Ching Huang ,  Cheng-Kuang Lin ,  An-Tung Chen

IPC: G05F1/00 ,  H02M3/04 ,  H02M1/08

CPC classification number: H02M3/04 ,  H02M1/08

Abstract: A control circuit of a switching regulator includes a control pin for coupling with an external resistor; a resistor detecting circuit for detecting a resistance of the external resistor; a current generating module for generating a corresponding control current according to a detection result of the resistor detecting circuit; an oscillating circuit for generating a clock signal; and a mode-switching circuit. When the mode-switching circuit configures the oscillating circuit to operate in a resistor-controlled mode, the oscillating circuit generates the clock signal according to the control current so that the clock signal has a frequency corresponding to the resistance of the external resistor. When the mode-switching circuit configures the oscillating circuit to operate in a signal-controlled mode, the oscillating circuit generates the clock signal according to an external synchronous signal coupled with the control pin so that the clock signal is synchronized with the external synchronous signal.

Abstract translation: 开关调节器的控制电路包括用于与外部电阻器耦合的控制引脚; 用于检测外部电阻器的电阻的电阻检测电路; 电流产生模块，用于根据电阻检测电路的检测结果产生相应的控制电流; 用于产生时钟信号的振荡电路; 和模式切换电路。 当模式切换电路将振荡电路配置为以电阻器控制模式工作时，振荡电路根据控制电流产生时钟信号，使得时钟信号具有与外部电阻器的电阻相对应的频率。 当模式切换电路将振荡电路配置为以信号控制模式工作时，振荡电路根据与控制引脚耦合的外部同步信号产生时钟信号，使得时钟信号与外部同步信号同步。