SLAA899 December   2019 TAS2110 , TAS2555 , TAS2557 , TAS2559 , TAS2560 , TAS2562 , TAS2563 , TAS2564 , TAS2770

 

  1.   Battery Voltage Tracking Limiter and Brown-Out Protection
    1.     Trademarks
    2. 1 Introduction
    3. 2 Benefits
    4. 3 Brown Out Protection and Limiter Design
    5. 4 VBAT tracking limiter
      1. 4.1 Threshold
      2. 4.2 Inflection Point and Slope
      3. 4.3 Attack
      4. 4.4 Hold Time
      5. 4.5 Release
    6. 5 Brown Out Protection (BOP)
    7. 6 System Testing
      1. 6.1 BOP (1)
      2. 6.2 BOP Release (2)
      3. 6.3 Limiter Release (3)
      4. 6.4 Maximum Output (4)
      5. 6.5 Limiter Attack (5)
      6. 6.6 BOP Attack (6)
    8. 7 Design Consideration
    9. 8 References

3 Brown Out Protection and Limiter Design

The VBAT tracking limiter will monitor the output voltage using an integrated Successive Approximation Register (SAR) converter while the outputs are active. The SAR is continuously sampling the VBAT voltage and feeding the result back to the Brown Out Protection and Limiter block. When the Brown Out Protection / Limiter detects that VBAT has gone below threshold it will update automatically and reduce the digital gain on the front end of the signal path as necessary to match the configuration programmed by the user.

BlockDiagram.gifFigure 1. TAS2562 Block Diagram