TPS61062: Brightness control of TPS61062

takahiko yokota

Mastermind 7135 points

Part Number: TPS61062

I got a question about TPS61062 from my customer.

They want to configure fiexed Vfb=344mV for brightness control.

Could you tell me those methods?

Best regards,

Yokota

over 6 years ago

0 Sean Zhou over 6 years ago

TI__Mastermind 22745 points

Hi Takahiko,
Yes, you can refer to TPS61062 datasheet page 11 for digital brightness control, for 344mV, you need to send 22 time of tup pulse through ILED pin, td is the delay time, tup is the increase time pulse, tdown is the decrease pulse time. For 344mV, you need to send td->tup->td->tup...(for 22 repeat times) and then send ->toff. pLease refer to the time sequence.
Regards
Sean

0 takahiko yokota over 6 years ago in reply to Sean Zhou

Mastermind 7135 points

Hi Sean-san

Thank you for the information.

Please let me further questions.

What should I logic level of ILED be after Vfb was 344mV?

Best regards

Yokota

0 Sean Zhou over 6 years ago in reply to takahiko yokota

TI__Mastermind 22745 points

Hi Yokota,
I think it should keep at low level.
Regards
Sean

0 Kenneth Du over 6 years ago in reply to takahiko yokota

TI__Genius 14295 points

Hi, Yokota,

I'll close this thread due to inactivity and if you have more questions please reply to it directly and it will open again.

Please help to click "Resolve" if the problem is solved.

Thanks.
Regards,

Kenneth

0 takahiko yokota over 6 years ago in reply to Kenneth Du

Mastermind 7135 points

Hi Kenneth-san

Please let me confirm ILED logic level.
Is 22step necessary to be correct as it recognizes that it works as follows?

1.ILED=High(Digital brightness control=Enable)
　→VFB=250mV
2.ILED=Low(tup=1us~75us)
　→VFB=15.6mV?
3.ILED=High(td=1.5us)
4.ILED=low(tup=1us~75us)
　→VFB=31.2mV
・
・
・
ILED=low(tup=1us~75us)
　→VFB=343mV
ILED=High(td=1.5us)
ILED=Low
　→VFB=343mV(Fix)

Best regards,
Yokota

0 Sean Zhou over 6 years ago in reply to takahiko yokota

TI__Mastermind 22745 points

Hi Yokota,
Yes, your understand is totally right. Please help me click "Resolve" button, Thanks.
Best regards
Sean

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TPS61062: Brightness control of TPS61062