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TPS543C20: TPS543C20

Allen1
Prodigy 120 points
Part Number: TPS543C20

Hi,

I have some questions about TPS543C20. Could you help with this? Thanks~

1. The datasheet said that "connect a resistor from VSEL pin to AGND to select internal reference voltage".  

    What does the "internal reference voltage" meaning? The reference voltage for EA or the output voltage?  From my understanding, the reference voltage just is the output voltage, right? And we can program the output voltage by adjusting the resistor connecting from VSEL to AGND.

2. For stand-alone applicatin, how to deal with the SYNC" pin? Just left floating?

3. Attachment is 2 12V to 0.85V power schematic, could you help have a check? 

Thanks a lot.TPS543C20 Power Schematic.pdf