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

Claim 18:
19. A system, 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 including:
a first transistor having a first control terminal, a first current terminal coupled to the current mirror input, and a second current terminal;
a first differential amplifier having a positive input, a negative input coupled to the second current terminal, and an output coupled to the first control terminal, the first differential amplifier configured to receive a first reference voltage at the positive input; and
a first variable resistor coupled between the negative input and the switch;

a second current path including:
a second transistor having a second control terminal, a third current terminal coupled to the first current mirror output, and a fourth current terminal;
a second differential amplifier having a positive input, a negative input coupled to the fourth current terminal, and an output coupled to the second control terminal, the second differential amplifier configured to receive a second reference voltage at the positive input; and
a second variable resistor coupled between the negative input of the second differential amplifier and the ground terminal;

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; and
a third variable resistor coupled between the second buffer and the first buffer.