The mirror heater load is driven by the TPS1HB16-Q1, a smart high-side power switch. The high-side switch has two variants. Variant B is used for this design which has a current limit range from 9.8 A to 49 A.

Figure 2-9 shows the configuration schematic for the mirror heater driver. The resistors (R10-R13, R15, and R23) and capacitors (C14, C15, and C21) values are chosen based on the recommendations by the data sheet. The capacitor C16 is used to filter voltage transients at the output. The resistor R14 is chosen to set the output current limit to 12.3 A.

Figure 2-9 TPS1HB16-Q1 Configuration Schematic