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UCC28881: Buck-boost with inverted output

Part Number: UCC28881

Tool/software:

Hi, based on application note slvaej3 (Figure 5), is it possibile to add an inverted output to UCC28881 starting from a Buck-boost configuration? Alternatevely, what is the best solution to convert and input from 15 to 48Vin to +/-20Vout (0.2A)?

Thanks

Application note:

UCC28881 datasheet