SLUAAS8 November   2024 TPS1210-Q1 , TPS4810-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2BMS System Overview
  6. 3Application of TPS1210-Q1 and TPS4810-Q1 to accomplish the Battery Disconnect Switch Design
    1. 3.1 Separate Charge and Discharge FET Control
    2. 3.2 Charge, Discharge FET Control With Pre-Charge Functionality
    3. 3.3 Current Sensing for Short Circuit Protection
    4. 3.4 Reverse Polarity Protection
    5. 3.5 Diagnostics
      1. 3.5.1 FET Diagnostics
      2. 3.5.2 Short Circuit Protection Comparator Diagnostics
      3. 3.5.3 Fault Indication
  7. 4Summary
  8. 5References

3.2 Charge, Discharge FET Control With Pre-Charge Functionality

Application Circuit for Pre-charge FunctionalityFigure 3-2 Application Circuit for Pre-charge Functionality

Loads such as ECUs, motor drives can have large amount of input capacitance. To limit the high inrush current during power up pre-charge feature of the TPS4810-Q1 and TPS1210-Q1 can be used. These devices can be configured as shown in Figure 3-2 to drive back to back FETs in the main path and also a parallel pre-charge FET. INP1 controls the Q1, Q2 FETs in the main path and INP2 controls the pre-charge FET Q3.

Once the load capacitor charges close to battery voltage then the main FET path can be turned ON and the pre-charge path can be turned off using the INP1 and INP2 control inputs.