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LM2576HV: How to get or convert to +12V from -48V telecom power supply rail

Part Number: LM2576HV

Tool/software:

I want to convert the -48V from rectifier output of telecom equipment to +12V DC. I'm considering the following schematic for that purpose:

The rectifier controller has -48V DC and +VE DC bus bar, the layout is pictured below:

How can I connect from busbar as an input to LM2576HV?

The 12V DC will be used to run microcontroller, sensor and boolean output (+5V)