TPS61181: TPS61181 circuit discussion

TT_Chin

Expert 2025 points

Part Number: TPS61181

Hi Sean,

Attached is our shcemtaic of TPS61181, could you please help to review it and provide your comment?

By the way, do you have any idae about how to improve the power efficiency of TPS61181?

Thanks!

Sincerely,

Chin

Green_Red_Blue LED.pdf

over 6 years ago

0 Sean Zhou over 6 years ago

TI__Mastermind 22745 points

Hi TT,
The schematic seems ok from my side. I have some commons as below:
1. for the capacitors connected to IFBx pins, it better to use 33pF, for such 0.01uF it may have some infulence on the dimming performance;
2. for better efficiency, you need to choose better inductor which has lower serial resistance and better diode.
3. Since you have already used three TPS61181 to drive R,G,B LEDs, I think this will increase the efficiency performance.
Regards
Sean

0 TT_Chin over 6 years ago in reply to Sean Zhou

Expert 2025 points

Hi Sean,

Okay, Thanks for your comment.

Sincerely,

Chin

0 TT_Chin over 6 years ago in reply to Sean Zhou

Expert 2025 points

Hi Sean,

Do you have any recommand part o LED driver that efficiency is better than Tps61181?

Our schematic is as attached, All the schematic is the same except of LED will change from 9 serial to 10 serial. Maximum Vf=35V.

Thanks!

Sincerely,

Chin

Green_Red_Blue LED_driver.pdf

0 Sean Zhou over 6 years ago in reply to TT_Chin

TI__Mastermind 22745 points

Hi Chin,

Could you share me more information about your application? Since we are developing a new device which shining point is high efficiency. I will share the information with our engineer.

Regards

Sean

0 TT_Chin over 6 years ago in reply to Sean Zhou

Expert 2025 points

Hi Sean,

Our application is a industrial tablet 10". And power source is DC input 12V or 13.2V from DC adapter.

The LED will be turned on by PWM control for RGB three color aura brightness.

Our sample run is on 15th of July, so is it okay for you to recommand a MP part to me for the design?

Because I worry about the developing part of you guys cannot meet our schedule.

Thank you for your help!

SIncerely,

Chin

0 Sean Zhou over 6 years ago in reply to TT_Chin

TI__Mastermind 22745 points

Hi Chin,

You can try with TPS61177A/TPS61187/LP8556 since it can change the switching frequency, it may help to achieve better efficiency.

Regards

Sean

0 TT_Chin over 6 years ago in reply to Sean Zhou

Expert 2025 points

Hi Sean,

Okay, thanks!

Sincerely,

Chin

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TPS61181: TPS61181 circuit discussion