Multi-fault protected high side switch with current sense
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United States of America Patent
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May 13, 2008
Grant Date -
Nov 25, 2004
app pub date -
May 20, 2003
filing date -
May 20, 2003
priority date (Note) -
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Abstract
An integrated high side switch with multi-fault protection. When a fault condition is detected, the switch is turned off. The switch includes a pair of transistors that are connected such that the source of the first transistor is connected with the source of the second transistor. The drain of the first transistor is thus connected to the supply voltage. A first current mirror generates a current sense output. A second current mirror generates an internal current to detect an over current fault condition. The transistors in the current mirrors are connected like the switch transistors. A high voltage operational amplifier and a transistor are used as feedback to insure that the voltage at the output of the current mirrors matches the voltage at the output of the switch. This ensures that the current mirrors generate scaled versions of the current flowing through the switch.
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