SLUS772G March 2008 – June 2020 TPS40210 , TPS40211
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A low forward voltage drop schottky diode is used as a rectifier diode to reduce its power dissipation and improve efficiency. Using 80% derating on VOUT for ringing on the switch node, the rectifier diode minimum reverse break-down voltage is given by Equation 41.
The diode must have reverse breakdown voltage greater than 30 V. The rectifier diode peak and average currents are estimated by Equation 42 and Equation 43.
The power dissipation in the diode is estimated by Equation 44.
For this design, the maximum power dissipation is estimated as 1 W. Reviewing 30-V and 40-V schottky diodes, the MBRS340T3, 40-V, 3-A diode in an SMC package is selected. This diode has a forward voltage drop of 0.48 V at 6 A, so the conduction power dissipation is approximately 960 mW, less than half its rated power dissipation.