ZHCSSP5D January 2009 – September 2023 TPS54332
PRODUCTION DATA
The TPS54332 is designed to operate using an external catch diode between PH and GND. The selected diode must meet the absolute maximum ratings for the application: Reverse voltage must be higher than the maximum voltage at the PH pin, which is Vin(max) + 0.5 V. Peak current must be greater than IOUTMAX plus on half the peak-to-peak inductor current. Forward-voltage drop must be small for higher efficiencies. Make note that the catch diode conduction time is typically longer than the high-side FET on time, so attention paid to diode parameters can make a marked improvement in overall efficiency. Additionally, check that the device chosen is capable of dissipating the power losses. For this design, a Diodes, Inc. B340A is chosen, with a reverse voltage of 40 V, forward current of 3 A, and a forward voltage drop of 0.5 V.