TPS92641: Constant current control issue

Koshi Ninomiya

Part Number: TPS92641

Dear Team,

My customer is evaluating the TPS92641 application by modifying the TPS92641EVM.
They increase V_IADJ from 0V to 2V (for V_CS=0.2V, ILED=5A). When ILED exceeds around 1A, on time becomes random or oscillalting. After than, constant current control also misaligns.
Please review their application specifications and settings attached below.

TPS92641 Laser Diode Driver.xlsx

Can you please support us understand what cause this issue?

Best Regards,

Koshi Ninomiya

4 months ago

0 Hongjia-Wu 4 months ago

TI__Genius 9950 points

Hi Koshi,

Our expert will check and come back to you later.

Regards,

Emma Wu

0 Gui He 4 months ago

TI__Mastermind 30276 points

Hi Koshi

Besides the SW voltage, Can you please measure the inductor current and share the waveform? You can also measure the COP voltage and see if it's stable.

Can you also share the part number of the inductor?

Thanks and best regards.

0 Gui He 3 months ago in reply to Gui He

TI__Mastermind 30276 points

Hi Koshi

I will close this thread for now since no response, please let me know if there are other questions.

Thanks.

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TPS92641: Constant current control issue