SLAAEI4 August   2024 TAC5111-Q1 , TAC5212-Q1 , TAC5311-Q1 , TAC5312-Q1 , TAC5411-Q1 , TAC5412-Q1 , TAD5212-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Signal Processing Chain
  6. 3Distortion Limiter
    1. 3.1 Distortion Limiter Parameters
      1. 3.1.1 Threshold Maximum
      2. 3.1.2 Threshold Minimum
      3. 3.1.3 Inflection Point
      4. 3.1.4 Slope
      5. 3.1.5 Attack Rate
      6. 3.1.6 Release Rate
      7. 3.1.7 Hold Counter
    2. 3.2 Limiter Response
  7. 4Brown-Out Protection
    1. 4.1 Brown-Out Protection Parameters
      1. 4.1.1 Critical Level
      2. 4.1.2 Gain Level
      3. 4.1.3 Attack Rate
      4. 4.1.4 Release Rate
      5. 4.1.5 Hold Counter
    2. 4.2 Brown-Out Protection Response
  8. 5Thermal Foldback
    1. 5.1 Thermal Foldback Parameters
      1. 5.1.1 Temperature Threshold
      2. 5.1.2 Maximum Attenuation Threshold
      3. 5.1.3 Slope
      4. 5.1.4 Attack Coefficient
      5. 5.1.5 Release Coefficient
      6. 5.1.6 Hold Counter
        1. 5.1.6.1 Thermal Foldback Response
  9. 6Example
  10. 7Summary
  11. 8References

4 Brown-Out Protection

The Brown-out protection technique works by applying a constant attenuation to the output signal based on user-defined critical VBAT levels. The degree of attenuation and critical VBAT levels are programmed and applied to the signal path irrespective of the audio input signal. This feature is valuable when the user wants the output signal to reduce to a defined signal level in the event there is a sudden drop in battery voltage. The output signal can increase back to the original state as the battery voltage recovers and is greater than the critical level parameters. Figure 4-1 displays how the configuration of this block attenuates the output signal as a function of battery voltage level.

BOP Output Configuration Figure 4-1 BOP Output Configuration

Figure 4-2 shows the response of the Brown-out protection block as VBAT surpasses or regresses VBAT critical levels.

Brown-Out Protection Example Figure 4-2 Brown-Out Protection Example

An attenuation of Gain Level 1 (G1) is applied to the output signal if VBAT is less than Critical Level 1 (CT1) and greater than Critical Level 2 (CT2). The output signal is reduced to the level of G2 if VBAT is less than CT1 and CT2. The Brown-out protection block gains up the output signal to the defined peak output as VBAT recovers.