STDA015 February   2026 DRV8163-Q1 , DRV8263-Q1 , LM61495-Q1 , LM70880-Q1 , LM74500-Q1 , LMR36503-Q1 , MCF8329A-Q1 , TLIN4029A-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Examples of Using 48V in Body Motor Applications
    1. 2.1 Door Module
    2. 2.2 Window Lift
    3. 2.3 Wiper
    4. 2.4 Power Seat
  6. 3Benefits of 48V Supply
    1. 3.1 Increased Integration of Half-Bridges with 48V
    2. 3.2 Size Comparison Between 48V Integrated Driver vs 12V Gate Driver
    3. 3.3 Example Placement Study
  7. 4Thermal and EMC Performance Trade-off Considerations
    1. 4.1 Conduction Losses in the MOSFETs
    2. 4.2 Switching Losses During PWM
    3. 4.3 Experimental Results Show Effect of Slew Rate on Transistor Temperature During PWM
    4. 4.4 Fast Slew Rates Impact Electromagnetic Emissions
  8. 5Summary
  9. 6About the Authors
  10. 7References

2.3 Wiper

The wiper system, when powered by the 48V rail, uses a rotary motor, either DC brushed or brushless (BLDC), to actuate the wiper mechanism. The driver controls the speed of the motor or drives to the park position based on user settings and optional rain sensor input. Motor current and motion information can be fed back to the MCU for precise control.

Typically front wipers have two speeds, as well as intermittent operation. If the motor is brushed type, it often has two windings, one for each speed. Newer designs may use 48V brushless motors which can be more efficient and long-lived. The speed of a brushless motor can be controlled by adjusting the phasing of the electrically commutated drive voltages.

An example block diagram for a 48V wiper module using a BLDC motor is shown in Example 48V Window Lift Block Diagram.

Example 48V Windshield Wiper Block Diagram Figure 2-3 Example 48V Windshield Wiper Block Diagram

The MCF8329A-Q1 BLDC gate driver shown in this example includes a 50 mA 3.3V regulator able to supply up to 50mA to external circuits. This regulator is disabled when the chip is in low-power sleep mode, but if the 48V supply to the wiper ECU is switched by an upstream Zone module or power distribution box, the regulator integrated in the MCF8329A-Q1 can be used rather than the TPS7A16A-Q1 regulator.