SLVAFT6 September   2024 TPS23521 , TPS23523 , TPS23525

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Existing Design and Challenges
  6. 3Negative Hot-Swap Controller – TPS2352x
  7. 4Output Voltage Clamping with TPS2352x
  8. 5Design Procedure and Implementation
    1. 5.1 Configuring the Current Limit Switch-Over Threshold for TPS2352x
    2. 5.2 Feedback and Control Loop Response
    3. 5.3 Powering the Feedback Amplifier
    4. 5.4 Noise Immunity
  9. 6Test Results
    1. 6.1 Startup
    2. 6.2 NEBS Transient Response
  10. 7Summary
  11. 8References

5.3 Powering the Feedback Amplifier

When the MOSFET is OFF, the negative input to the op-amp is floating which causes the op-amp to saturate due to common mode voltage as shown in Figure 5-2. Independent high-voltage linear regulators such as TPS7A4001 can be a good option to power op-amp at 12V.

Implementation Using OPA863 Op-amp and TPS7A4001 Regulator Figure 5-2 Implementation Using OPA863 Op-amp and TPS7A4001 Regulator