TPSM843620: TPSM843620 soldering and 12V to 5V

Riswitha patel

Prodigy 20 points

Part Number: TPSM843620

Tool/software:

Hi Sir,

Can you please provide the soldering guidelines for the part TPSM843620.

Thankyou.

1 month ago

0 David_Daniels 1 month ago

TI__Mastermind 20810 points

Here is a link to the solder and reflow profile MSL Ratings and Reflow Profiles (Rev. A)

0 Riswitha patel 1 month ago

Prodigy 20 points

Hi Sir,

As we are not able to get the output when we use TPSM843620 for 12V to 5V conversion. But the same IC is working fine for 5V to 0.85V conversion. Can you please provide the debugging techniques for TPSM843620.

Thankyou.

0 David_Daniels 1 month ago in reply to Riswitha patel

TI__Mastermind 20810 points

Is the device configured to switch at 2.2MHz or 1.5MHz. If not, the 12V to 5V will have a large ripple current and device maybe exceeding hs current limit or sinking current limit. do you have a schematic or oscilloscope plots.

0 Riswitha patel 1 month ago in reply to David_Daniels

Prodigy 20 points

Hi Sir,

The device is configured to 1MHZ.

0 David_Daniels 1 month ago in reply to Riswitha patel

TI__Mastermind 20810 points

The device is ripple is hitting sinking current limit or the high side current limit.

The attached excel sheet shows the design error for the 1MHz design on the "input sheet" tab on column E.

TPSM843320-620-820_Calculator_RevA_e2e.xlsm

0 Riswitha patel 1 month ago in reply to David_Daniels

Prodigy 20 points

Hi Sir,

Thanks for your reply. By using the feedback resistors of values 10k and 1k, we are able to get our desired output of 5v, when we connect it to 5 W load, the voltage is getting dropped and getting 3v. Is there any reason for that.

0 David_Daniels 1 month ago in reply to Riswitha patel

TI__Mastermind 20810 points

What are you testing a TI evm or a board you have developed?

If you are testing a board you developed, can you share schematic, board layout and

oscilloscope plots of the output voltage, input voltage, sw pin if you have access.

If there is no access to sw pin, if you can capture the output ripple (ac coupled) with a scope probe, similar figure 7-16 in datasheet

If you are testing a TI EVM, can you share the boards setting and other modifications.

Can you use a constant resistance or constant current mode on the eload and test. In constant power mode,

i think the current limit draw may be changing with the voltage.

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TPSM843620: TPSM843620 soldering and 12V to 5V