Patent ID: 11949320
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 9:
10. A device, comprising:
a current mirror having a current mirror input, a first current mirror output, and a second current mirror output;
a switch configured to switch between a ground terminal or a low-side power transistor based on a control signal;
a first current path coupled between the current mirror input and the switch and configured to receive a first reference voltage;
a second current path coupled between the first current mirror output and the ground terminal and configured to receive a second reference voltage;
a first buffer coupled to the second current mirror output and having a first buffer output;
a second buffer configured to receive a third reference voltage;
a variable resistor coupled between the second buffer and the first buffer;
a temperature-sensing circuit having a temperature-sensing circuit output, the temperature-sensing circuit configured to provide a device temperature at the temperature-sensing circuit output; and
a controller coupled to the first buffer output and the temperature-sensing circuit output and configured to:
determine a first adjustment to the first and second current paths and a second adjustment to a resistance of the variable resistor based on the device temperature; and
determine a current through the low-side power transistor based on a voltage at the first buffer output and a voltage between the switch and the ground terminal.