SNVAAA7 October   2024 LM5013 , LM5013-Q1 , LM5141 , LM5141-Q1 , LM5143 , LM5143-Q1 , LM5143A-Q1 , LM5145 , LM5145-Q1 , LM5146 , LM5146-Q1 , LM5148 , LM5148-Q1 , LM5149 , LM5149-Q1 , LM5190-Q1 , LM65645-Q1 , LM70660 , LM706A0 , LM706A0-Q1 , LM70840 , LM70840-Q1 , LM70860 , LM70860-Q1 , LM70880 , LM70880-Q1 , LM76003 , LM76003-Q1 , LM76005 , LM76005-Q1 , TPS54360B , TPS54360B-Q1 , TPS54560 , TPS54560B , TPS54560B-Q1 , TPS54561 , TPS54561-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Efficiency and Thermals Comparison
  6. 3Design Size Comparison
  7. 4EMI and EMI Filter Comparison
  8. 5Other Design Considerations When Using Controllers and Converters
    1. 5.1 Power MOSFET Selection
    2. 5.2 Feature Set
    3. 5.3 Minimum On-Time for High Voltage Conversions
    4. 5.4 Power Inductor Consideration
  9. 6Summary
  10. 7References

Power Inductor Consideration

A good power design practice is to use an output inductor with a saturation current rating higher than the maximum high side current limit specification of a regulator, this makes sure that the inductor does not saturate even during a soft-short condition on the output.

As an example, some converters rated for 65V 8A have a maximum current limit greater than 17A whereas a controller can have a max current limit of approximately 12A for an 8A continuous output design. Higher current limits can restrict inductor choices and can require slightly larger or taller inductors versus what could be used with a device with tighter current limits. LM70880-Q1 shares the benefit of having tight current limits which can enable lower cost or smaller inductors.