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TPS2113A: How to define the voltage transfer threshold

Part Number: TPS2113A

Hi.

I have a question regarding the TPS2113A. How does one define the threshold voltage when the TPS2113A will automatically switch from IN1 to IN2? Is there a formula like voltage divider since I could not understand it from the datasheet?

I found a formula on Pololu site https://www.pololu.com/product/2596 , Vtresh = (R/20K + 1)*0.8 and the following schematic: https://a.pololu-files.com/picture/0J5500.600.png?c869a7be3040f34658145e275a8ae51e   But is that formula related to their given schematic, where the R = 20 K connected to VSNS. So it says: Vtresh = (R/20K + 1)*0.8 so if the R is 20K, does that mean if IN2 is 5V. Will it switch then IN2-1.6V  =>    5-1.6V = 3.4 basically when IN1 drops below 3.4 V it switches to IN2? Maybe I misunderstood it. I hope you can help me out. Thank you

Regards

• Hi,

Ok, I think I got it! The VSNS pin has to be above ~0.8V and IN1 is active, if less then IN2 gets active! Unless I got it wrong, you can consider this question as answered!

Best regards,
Refik
• Hi Refik,

You're correct when VSNS is above 0.8V then IN1 is active; however, when <0.8V, the output will be whichever of the input is higher voltage. This is shown in the truth table of the datasheet.
• Hi Darwin,

thank you for the explanation! That answers my question!