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LM5175: max Vin of 60V?

Part Number: LM5175
Other Parts Discussed in Thread: UCD3138

Team,


The datasheet does mention at page 1:
http://www.ti.com/lit/ds/symlink/lm5175.pdf
"The LM5175 operates over a wide input voltage range of 3.5 V to 42 V (60 V maximum) to support a variety of applications."

Under which condition can 60V can be used for input?
I am looking for solution for Vin: 48V, Vout: 2V < x< 5V and that can source more than 50A.
Can multiple LM5175 be cascased/sync to achieve higher current rating than 20 A?

The idea is to have an analog control with no MCU.

Thanks in advance,

Anthony