SLUAAN7 april   2023 TPS1211-Q1 , TPS4811-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1TPS1211-Q1 High Side Switch Controller Overview
  4. 2System Design Examples with Reverse Battery Protection
    1. 2.1 Design 1: Power Distribution Box
    2. 2.2 Design 2: Body Motors Load driving
    3. 2.3 Design 3: Heater Load Driving
      1. 2.3.1 Reverse Battery Protection with MOSFET OFF
      2. 2.3.2 Reverse Battery Protection with MOSFET ON
  5. 3Summary
  6. 4References

2.1 Design 1: Power Distribution Box

Figure 2-1 shows an example of power distribution box with two-channel outputs VOUT1 and VOUT2. Input power source can be from a battery or a DC-DC. A grouped input reverse battery protection scheme is implemented using LM74500-Q1 reverse polarity protection controller and an external MOSFET Q1.

The output of the LM74500-Q1 reverse battery protection stage is connected to the TPS12110-Q1 high side switch controllers. The TPS12110-Q1 ICs and the loads connected to the outputs gets protected from the input reverse battery condition by the LM74500-Q1 circuit. During input reverse battery condition the LM74500-Q1 controller pulls GATE to SOURCE and the MOSFET Q1 gets turned OFF disconnecting the input battery connection to the downstream TPS12110-Q1 ICs and the loads.

TPS12110-Q1 does not see reverse voltages and therefore does not need any special reverse protection techniques for this section of the system design.

GUID-20230201-SS0I-VQPZ-FNBJ-ZXZNSPJVHL5N-low.svg Figure 2-1 Power Distribution Box with Grouped Reverse Battery Protection Using LM74500-Q1 Controller