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LM51561H-Q1: LM51561H-Q1

Part Number: LM51561H-Q1
Other Parts Discussed in Thread: LM5155

If I want to design the converter to turn on at 25V, and off at 20V, and the caculated result is the bottom resistor is 638k, but it seems it can not turn off because there a current source 5uA internally. And is there any other limits about the divided resisitor? thanks.