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TPS61040: TPS61040 Boost 24V Up to 28V

Part Number: TPS61040
Other Parts Discussed in Thread: LM5001

dear support team:

      my circuit board need a 28v power rail,and there only one 24v power source.

      since TPS61040 Vin range from 1.8v to i add a 20v zener diode between the 24V and vin pin.

      is it will work fine ? any extra suggestion ?