TPS54531: Derivation of UVLO resistor equations

Fredda

Intellectual 625 points

Part Number: TPS54531

Out of curiosity it would be nice to know how the UVLO resistors equations are derived.

Regards

over 8 years ago

0 Andy Chen over 8 years ago

TI__Mastermind 34875 points

V1=Vstart divided by Ren1 and Ren2
V2=1uA*(Ren1//Ren2)
V1+V2=Ven-------------(1)

change 1uA to 4uA after Enable
V3=4uA*(Ren1//Ren2)
V4=Vstop divided by Ren1 and Ren2
V3+V4=Ven------------------(2)

the equation for Ren1 and Ren2 can be derived by solve equation (1) and (2)

0 Fredda over 8 years ago in reply to Andy Chen

Intellectual 625 points

Got it. Thanks!

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TPS54531: Derivation of UVLO resistor equations