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TPS54394: About VIN1 and VIN2

Part Number: TPS54394


Customers are considering TPS54394.
I got three questions from customers.
Could you give me your advice?

1.Is it OK to add another voltage to VIN1 and VIN2?
2.Is the internal circuit control voltage (Vreg5) supplied from either VIN1 or VIN2?

Best Regards,
Yusuke/Japan Disty