TIDT281 June 2022
This two-switch buck boost controlled by the
LM5118 device is stepping up and stepping down an input voltage range of 30 V to 60
V to either 24-V or
48-V output voltage. Jumper #3 at the digital-to-analog converter (DAC) is used to decide for 24 VOUT or 48 VOUT – with jumper 48 VOUT, without 24 VOUT.
For the final application, the 48-V output voltage is just needed for short term use < 1 s. For test purposes the power stage withstands this power level continuously, so the power stage itself could be shrunk for the final application.
Modify the loop bandwidth from between 600 Hz, 1200 Hz, and 2400 Hz – the default is 1.2 kHz. The final application adds a reactive load to the output and needs to be adapted; this prototype supports three different tested variants.