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

6 System Testing

To demonstrate the complete response of the limiter and BOP when in use together the following setup was used.

  • VBAT = 5 V - 3.5 V
  • Vth MAX = 8 V
  • Vth MIN = 4 V
  • Inflection point = 4.8 V
  • Slope = 4 V/V
  • Max Attenuation = -16.5 dB
  • BOP threshold = 3.6 V

The supply voltage was ramped up and down repeatedly to produce the following output response.

Supply-Ramp.gifFigure 10. Supply Ramp Test

Various operation stages can be observed