SDAA093 February   2026 BQ25770G , BQ25773

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Dual Random Spread Spectrum (DRSS)
  6. 3Why is DRSS Needed?
  7. 4BQ25773 DRSS Evaluation
    1. 4.1 Equipment
    2. 4.2 Equipment Setup
    3. 4.3 Evaluation and Results
  8. 5Summary
  9. 6References

4.2 Equipment Setup

Use the following steps to evaluate the functionality of the BQ25773 DRSS Feature

  1. Connect the 36V power supply to the input of both LISNs, one for each power line.
  2. Connect the output of the LISN's to the input of the BQ25773 EVM (J1).
  3. Connect the load/battery simulator to output of the BQ25773 EVM (J3).
  4. Connect the EMI Analyzer signal cable to the positive LISN signal output.
  5. Use the EV2400 communicate with the BQ25773 to configure the board per the BQ2577xEVM Evaluation Module.
  6. Configure the EMI receiver for CISPR32 evaluation. The required settings depend on the CISPR 32 version being used and the specific emi receiver model
  7. Use REGx3D[3:4] to configue DRSS frequency dithering.

When evaluating DRSS functionality, TI recommends first capturing the conducted EMI measurement under normal operation with dithering disabled and then evaluate with dithering enabled.