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TPS40305 feedback resistors are not right #20

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skot opened this issue Jan 17, 2023 · 3 comments
Closed

TPS40305 feedback resistors are not right #20

skot opened this issue Jan 17, 2023 · 3 comments
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bug Something isn't working max_v2

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@skot
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skot commented Jan 17, 2023

The TPS40305 voltage regulator feedback resistors R14 and R15 are not the right values.

The good news is that this makes the TPS40305 output like 0.64V which is harmless. But you'll never be able to to adjust it up to the 1.5V it needs to be.

I'll add the correct values here soon.

@skot skot added bug Something isn't working max_v2 labels Jan 17, 2023
@skot skot self-assigned this Jan 17, 2023
@skot
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skot commented Jan 17, 2023

For a default TPS40305 output of 1.5V the feedback resistor values should be;
R14 = 4.99kΩ
R15 = 3.32kΩ

I don't have any 4.99k resistors to try yet, so I used 4.75k for R14 and got an output of 1.452V -- not bad!

@developeralgo8888
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i will have to rectify this on my prototype boards before i can continue with tests

@skot
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skot commented May 23, 2023

this was fixed in 1881967

@skot skot closed this as completed May 23, 2023
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