SLVAFP0 December   2023 LMR51610

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Specifications
    1. 2.1 Input Voltage Range
    2. 2.2 Output Current Range
  6. 3External Component Selection
    1. 3.1 Duty Cycle Calculation
    2. 3.2 Output Voltage Calculation
    3. 3.3 Inductor Selection
    4. 3.4 Input and Output Capacitor
    5. 3.5 Enable Level Shift
    6. 3.6 Output Clamp Diode
  7. 4Evaluation Results
    1. 4.1 Typical Performance
    2. 4.2 Loop Response Bench Verification
  8. 5Conclusion
  9. 6References
  10. 7LMR50410 Design Example
    1. 7.1 LMR50410 Output Current Range
    2. 7.2 LMR50410 Efficiency

3.6 Output Clamp Diode

To prevent the negative output from becoming too positive, a diode across the negative output supply needs to be used. Because there is a cap from Vin to negative output, if large line transients, the current can go through from input cap to LS and inductor return to GND, hence larger spike on negative side show up, adding a diode can help to protect LS from damaged by positive voltage on output. Increase the output cap can also help to solve this problem. See Figure 3-3.

GUID-20230904-SS0I-XVNS-BPBQ-VDF4C4C3BGBN-low.svg Figure 3-3 Design Negative and Positive Output in one System Circuit