TPSM828302: Buck Regulator - operating Issue

Madhumitha Karado

Part Number: TPSM828302

We bought taken sample of TPSM828302ARDSR from TI, when we are designed for 5VDC to 3.3VDC in general purpose board,

we observed the Output voltage same as input Voltage. find the reference circuit below.

Kindly share the response ASAP.

0 Josef Marsmann over 2 years ago

Hello Madhumitha,

according the formula in the data sheet you have configured the feedback divider for Vout=3.5V.

In general the schematic looks ok, so I would recommend to do some measurements:

Create a scope plot with Vin, Vout, FB and SW signal
For the FB signal you need a high impedance probe!
Change the feedback divider to R15=220Ω and R16=50Ω
Do the same measurements again.

I'm waiting for your feedback.

Best regards, Sepp

0 Madhumitha Karado over 2 years ago in reply to Josef Marsmann

Thanks Josef, when we updated R15 and R16 values as per your suggestion we can able to see the voltage properly.

0 Josef Marsmann over 2 years ago in reply to Madhumitha Karado

Hello Madhumitha,

Thanks your your feedback.

Best regards, Sepp

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