TPS61165: Driver Not Regulating Current

TI-CSC

Part Number: TPS61165
Other Parts Discussed in Thread: TPS61169,

Tool/software:

Hello E2E Experts,

Good day.

I'm building a project with your TPS611655DBVR driver. It is powered by a 4.2V battery. The 4p6s LED matrix is powered with the required current of 180mA and 16V. But the driver does not regulate the current, I connect the multimeter to the matrix plus and SW plus and get an unstable current depending on the input voltage. Please help me solve the problem. CTRL is connected via 10kOhm to +5V input.

Regards,

TICSC

1 month ago

0 Colin Chen 1 month ago

TI__Mastermind 21091 points

Hi,

Could you share your schematic to me for check?

In addition, the SW, Vout waveforms is needed.

Thanks,

Colin

0 TI-CSC 1 month ago in reply to Colin Chen

TI__Genius 12915 points

Hello Colin,

Good day.

The issue is now resolved.

However, I have another question:

Is the TPS61169 driver better than the TPS61165 driver suitable for my project described above?

Regards,

TICSC

0 Colin Chen 1 month ago in reply to TI-CSC

TI__Mastermind 21091 points

Hi Sir,

Yes, TPS6119 is larger in output current than TPS61165.

Thanks,

Colin

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TPS61165: Driver Not Regulating Current