Invention Grant
US08154334B2 System and method for pre-charging a bootstrap capacitor in a switching regulator with high pre-bias voltage 有权
在具有高预偏置电压的开关稳压器中对自举电容器进行预充电的系统和方法

  • Patent Title: System and method for pre-charging a bootstrap capacitor in a switching regulator with high pre-bias voltage
  • Patent Title (中): 在具有高预偏置电压的开关稳压器中对自举电容器进行预充电的系统和方法
  • Application No.: US12611701
    Application Date: 2009-11-03
  • Publication No.: US08154334B2
    Publication Date: 2012-04-10
  • Inventor: Jue Wang
  • Applicant: Jue Wang
  • Applicant Address: US CA Milpitas
  • Assignee: Intersil America Inc.
  • Current Assignee: Intersil America Inc.
  • Current Assignee Address: US CA Milpitas
  • Agency: Howison & Arnott, L.L.P.
  • Main IPC: G05F1/10
  • IPC: G05F1/10 G05F3/02
System and method for pre-charging a bootstrap capacitor in a switching regulator with high pre-bias voltage
Abstract:
An apparatus comprises a voltage regulator including an high side switching transistor and a low side switching transistor. An high side drive controls operation of the high side switching transistor. A low side driver controls operation of the low side switching transistor. A bootstrap capacitor provides an operating voltage to the high side switching driver. The bootstrap capacitor is charged to a predetermined level responsive to a supply voltage. A low side driver drives the low side switching transistor according to a process that charges the bootstrap capacitor to the predetermined level. The process turns on the low side switching transistor for a first predetermined number of cycles and turns off the low side switching transistor for a second predetermined number of cycles. The process is repeated for a predetermined number of times during startup of the voltage regulator when a prebias load is applied to the voltage regulator.
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