公开(公告)号：US20140152282A1

公开(公告)日：2014-06-05

申请号：US14084590

申请日：2013-11-19

Applicant: Renesas Electronics Corporation

Inventor： Kyoichi HOSOKAWA ,  Ryotaro KUDO ,  Toshio NAGASAWA ,  Koji TATENO

IPC: H02M3/158

CPC classification number: H02M3/1588 ,  G05F1/44 ,  H02M7/538 ,  H03F3/217 ,  H03F2200/351 ,  H03F2200/78 ,  H03K17/063 ,  H03K17/687 ,  Y02B70/1466

Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.

Abstract translation: 在开关电源中，其通过响应于PWM信号进行开关动作的开关元件来控制在电感器中流动的电流，并且通过串联设置在电感器中的电容器形成输出电压， 在开关元件的输出节点和预定的电压端子之间设置由自举电容构成的MOSFET和MOSFET。 升压电压用作开关元件的驱动电路的工作电压，另一个源极/漏极区域和衬底栅极彼此连接，并且在一个源极/漏极区域和衬底栅极之间的结二极管被反向导向 相对于由自举容量形成的升压电压。