• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 244 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS61023: Current Limit is not happening

Jilna Jayan
Prodigy 100 points
Part Number: TPS61023

Hello,

I have designed a board using TPS61023 IC. This is used for Mobile Charger application. Input and output specifications are mentioned below:

Input Voltage - 2.8V - 4.2V

Output Voltage - 5V

Output Current - 1A

The Inductor I have selected is 2uH. 

When I am increasing the load current above 1A, current limit operation was not happening. It is happening at 2A. When the load current reaches 2A, output voltage decreases.

But I want this to happen when the load current reaches 1A.

Could you please help me to resolve this issue.

Regards,

Jilna

  • 0
    TI__Mastermind 34231 points

    Hi Jilna,

    Thanks for reaching out.

    The boost converter TPS61023 employs a valley current control method and limits inductor valley current at 3.7A typically. And minimum sepc is 2.7A. 

    Because inductor current equals input current for a boost converter, so this device is limiting the input current at a certain value, not the output current. With different input voltage, the maximum output current capability is different.

    You have to add a load switch after TPS61023 output.

  • 0 in reply to Zack Liu
    Prodigy 100 points

    Hi Sir,

    Is there any alternate way to solve this issue, other than adding a load switch?

    Can I adjust the Inductor value?

    Regards,

    Jilna Jayan

  • 0 in reply to Jilna Jayan
    TI__Mastermind 34231 points

    Hi Jilna,

    It's not possible to control the output current. Boost converter is only limiting the input current and it's current limit accuracy has bigger variation compared to accurate load switch device. Sorry.