ZHCS901E May 2012 – September 2021 TPS55340
PRODUCTION DATA
The high switching frequency of the TPS55340 demands high-speed rectification for optimum efficiency. Ensure that the average and peak current ratings of the diode exceed the average output current and peak inductor current. In addition, the reverse breakdown voltage of the diode must exceed the regulated output voltage. The diode must also be rated for the power dissipated which can be calculated with Equation 26.
In this conservative design example, the diode is chosen to be rated for the maximum output current of 2.13 A. During normal operation with 800-mA output current and assuming a Schottky diode drop of 0.5 V, the diode must be capable of dissipating 400 mW. The recommended minimum ratings for this design are a 40-V, 3-A diode. However, to improve the flexibility of this design, a Diodes Inc B540-13-F in an SMC package is used with voltage and current ratings of 40 V and 5 A.