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UC3707: VL and VH

Part Number: UC3707

Hi sir,

I wanna use UC3707 for VIN = VC = 40V condition.

The signal input (input A, input B) will be supplied from the FPGA,

but what are the digital input low level and digital input high level at 40V?

The data sheet has only 20 V conditions.

Digital input low level Max 0.8V
Digital input high level   Min 2.2V

The same to 20 V conditions? or other condition.

Hope you can clarify this query.