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  1.   Basic Calculation of a Boost Converter's Power Stage
  2. Basic Configuration of a Boost Converter
    1. 1.1 Necessary Parameters of the Power Stage
  3. Calculate the Maximum Switch Current
  4. Inductor Selection
  5. Rectifier Diode Selection
  6. Output Voltage Setting
  7. Input Capacitor Selection
  8. Output Capacitor Selection
  9. Equations to Calculate the Power Stage of a Boost Converter
  10. References
  11. 10Revision History

Rectifier Diode Selection

To reduce losses, Schottky diodes should be used. The forward current rating needed is equal to the maximum output current:

Equation 7. GUID-CE866F9F-35D9-4FD5-9B63-710143B2B4C9-low.gif

IF = average forward current of the rectifier diode
IOUT(max) = maximum output current necessary in the application

Schottky diodes have a much higher peak current rating than average rating. Therefore the higher peak current in the system is not a problem.

The other parameter that has to be checked is the power dissipation of the diode. It has to handle:

Equation 8. GUID-7E6025E5-481B-4FB7-90BA-CA36133863B7-low.gif

IF = average forward current of the rectifier diode
VF = forward voltage of the rectifier diode