公开(公告)号：US09634480B1

公开(公告)日：2017-04-25

申请号：US14486697

申请日：2014-09-15

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Daniel James Eddleman ,  Mitchell Edward Lee ,  Zhizhong Hou

IPC: H02H5/04 ,  H03K17/081 ,  H03K17/082 ,  H01C1/16 ,  H03K17/08

CPC classification number: H02H5/04 ,  H01C1/16 ,  H03K17/08104 ,  H03K17/0822 ,  H03K2017/0806

Abstract: A circuit for protecting a semiconductor element is provided in a system for supplying power from an input node to an output node. The circuit has an analog multiplier responsive to a voltage across the semiconductor element and a current flowing through the semiconductor element to produce an output voltage. A transconductance amplifier is coupled to an output of the analog multiplier for receiving the output voltage of the analog multiplier to produce an output current. An analog RC circuit coupled to the output of the transconductance amplifier is configurable to include a selected number of resistive elements having selected resistance values and a selected number of capacitive elements having selected capacitance values. The configuration of the RC circuit is carried out to provide an RC thermal model that reproduces a desired thermal behavior of the semiconductor element. The RC circuit is responsive to the output current of the transconductance amplifier to produce an output voltage used to control the semiconductor element.

公开(公告)号：US09634481B2

公开(公告)日：2017-04-25

申请号：US15088714

申请日：2016-04-01

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Daniel James Eddleman ,  Mitchell Edward Lee ,  Zhizhong Hou

IPC: H02H5/04 ,  H03K17/082 ,  H03K17/08

CPC classification number: H02H5/04 ,  H01C1/16 ,  H03K17/08104 ,  H03K17/0822 ,  H03K2017/0806

Abstract: A circuit for protecting a semiconductor element is provided in a system for supplying power from an input node to an output node. The circuit has an analog multiplier responsive to a voltage across the semiconductor element and a current flowing through the semiconductor element to produce an output voltage. A transconductance amplifier is coupled to an output of the analog multiplier for receiving the output voltage of the analog multiplier to produce an output current. An analog RC circuit coupled to the output of the transconductance amplifier is configurable to include a selected number of resistive elements having selected resistance values and a selected number of capacitive elements having selected capacitance values. The configuration of the RC circuit is carried out to provide an RC thermal model that reproduces a desired thermal behavior of the semiconductor element. The RC circuit is responsive to the output current of the transconductance amplifier to produce an output voltage used to control the semiconductor element.