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Suitable Boost converter chip

Other Parts Discussed in Thread: UCC28C53, UC2843, UCC28C43

Hello,

Can you please suggest suitable 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