Documents

2013-02 PROFET AppNote Operating Modes (4)

Categories
Published
of 16
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Description
Aut omot i ve Power Appl i cat i on Not e V1.0 2011-07-13 Aut omot i ve Power PROFET™ Operating Modes (Normal, Inverse, Reverse) PROFET™ Operating Modes (Normal, Inverse, Reverse) Application Note 2 V1.0, 2011-07-13 PROFET Operating Modes Revision History: V1.0, 2011-07-13 Previous Version: none Page Subjects (major changes since last revision) PROFET™ Operating Modes (Normal, Inv
Transcript
     Automotive Power  Application Note V1.0 2011-07-13  Automotive Power   PRO FET™ Operating Modes (Normal, Inverse, Reverse)    PROFET™ Operating Modes (Normal, Inverse, Reverse)    Application Note 2 V1.0, 2011-07-13 PROFET Operating Modes Revision History: V1.0, 2011-07-13 Previous Version: none Page Subjects (major changes since last revision)    PROFET™ Operating Modes (Normal, Inverse, Reverse)   Table of Contents  Application Note 3 V1.0, 2011-07-13 Table of Contents 1   Abstract ............................................................................................................................................... 4   2   Introduction ........................................................................................................................................ 4   2.1   Terms and Abbreviations ..................................................................................................................... 4   2.2    Alternative Automotive Switching Configurations ................................................................................ 5   2.3   High-Side Switch Pin Names and Functions ....................................................................................... 5   2.4   Inside a PROFET high-side switch ...................................................................................................... 6   2.5   Introducing the Normal, Inverse, and Reverse Modes......................................................................... 7   3   Normal Mode ....................................................................................................................................... 8   4   Inverse Mode ...................................................................................................................................... 8   4.1   Introduction ........................................................................................................................................... 8   4.2   Switch-, Module-, and Application-Level Considerations ................................................................... 10   5   Reverse Mode ................................................................................................................................... 11   5.1   Introduction ......................................................................................................................................... 11   5.2   Switch-, Module-, and Application-Level Considerations ................................................................... 12   6   Conclusion ........................................................................................................................................ 13      PROFET™ Operating Modes (Normal, Inverse, Reverse)   Abstract  Application Note 4 V1.0, 2011-07-13 1 Abstract Smart, high-side power switches from Infineon® are designed to control all types of resistive, inductive, and capacitive loads within harsh automotive environments. The highly integrated PROFET™ (PROtected FET) family of high-side switches incorporates a broad range of smart features including sophisticated diagnostic and protection capabilities. The high-current PROFET power switches consist of a DMOS power MOSFET and CMOS logic circuitry. These switches offer protection against a wide range of conditions such as overload, overtemperature, and short circuit for all types of automotive and industrial applications. In automotive applications, the normal operating mode  is defined when the battery supply voltage is more positive than the output load voltage. In some cases, transient conditions may cause the battery voltage to become less positive than the output load voltage; this is known as the inverse mode . In other cases (such as replacing the battery or during jump-start conditions), the polarity of the battery might be applied in the reverse direction; this is known as the reverse mode . Some PROFET high-side switches have the ability to operate in inverse mode conditions and/or reverse mode conditions. This application note first introduces some fundamental concepts. This is followed by a discussion of the normal, inverse, and reverse operating modes (OpModes) that may be encountered by high-side switches in automotive applications. The application note then considers the effects of inverse and reverse mode conditions on high-side switches (with and without inverse current and reverse battery capabilities); the electronic control units (ECUs) in which the switches reside, and the applications (loads) being controlled by the switches. 2 Introduction 2.1 Terms and Abbreviations The terms and abbreviations used in this application note are summarized in Table 1.  Table 1 Terms and abbreviations Abbreviation Meaning ECU Electronic control unit HSS High-side switch I  L  Load current (positive value indicates V  bb  > V  OUT ; negative value indicates V  bb  < V  OUT )  – I  L(inv)  Maximum transient inverse load current R  ON   Resistance of the power MOSFET when the switch is ON in normal  mode R  ON(inv)  Resistance of the power MOSFET when the switch is ON in inverse  mode R  ON(rev)  Resistance of the power MOSFET when the switch is ON in reverse  mode V  bb  Battery voltage (measured across the battery terminals)  – V  OFF  The voltage drop across the power MOSFET’s intrinsic diode (also known as a body diode) when the switch is OFF in the inverse or reverse modes V  OUT  Output voltage (measured across the load)
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks