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UC1843: Boost converter design

Part Number: UC1843


Can you please clarify whether this chip (UC1843) can be used for Boost converter to meet the following requirements?

Vin range : +20VDC to +140VDC

Vout Output voltage : +70VDC 

Output current : 0.9A

We want to pass through the Vin when the input voltage goes above the Vout.

thank you,

Johnson John