TPS54260 Power IC Data Sheet

[Wilksey]

Hi Guys,

Page 14 here: https://www.farnell.com/datasheets/614070.pdf describes the "Under Voltage Lock Out", I am trying to go through the calculations for the schematic on page 30, and I have the following equation:
R1 = VStart - VStop / IHys

Where VStart = 6.0V, VStop = 5.5V and IHys I assume I have read correctly in the description on page 14 as 2.9uA.

Which would be (6.0-5.5) / 2.9, which gives me 1.45, yet the datasheet says it is 1.24(124k Resistor), can anybody tell me what I am missing from the equation?!

Many Thanks

Wilksey

 

[alec_t]

Well I get (6.0-5.5)V/2.9μA = 172k! The datasheet does mention 0.9μA and an additional 2.9μA. But (6.0-5.5)/(0.9 + 2.9) gives 132k!