• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 542 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

When Power up DCP010505 Current up to 2A,Why?

huo lifeng
Prodigy 60 points

hello,I meet a problom in my project.

There is 5 DCP010505BP in my PCB, and VIN is 5V, when Power up , The total current can be 2A, but after about 1 second, it could be change to 200mA.

Sometimes , It can keep 2A all time. If I disconnect the DCP DC-DC, the current will keep 80mA at each power up.

what had happened? Can you give me some suggestions?

 

  • 0
    Prodigy 60 points

    I can  not find a resolve Method.

  • 0 in reply to huo lifeng
    TI__Mastermind 38230 points

    huo lifeng replied to When Power up DCP010505 Current up to 2A,Why? in Isolated Controllers / Motor Controllers Forum.

    hello,I meet a problom in my project.

    There is 5 DCP010505BP in my PCB, and VIN is 5V, when Power up , The total current can be 2A, but after about 1 second, it could be change to 200mA.

    Sometimes , It can keep 2A all time. If I disconnect the DCP DC-DC, the current will keep 80mA at each power up.

    what had happened? Can you give me some suggestions?

     

     

    The DCP0105050 when initial power power can sink up to 750mA per converter. If the input power source  (5V) cannot supply more than 2A during dv/dt, the power converters may not power on . the dv/dt of the power source is not capable of source current during transition from 0V to 5V. The input voltage to the DCP01 is at about 3.4V to 3.6V ( from power source) fro seconds.

    I attached one method to delay the power-on to the DCP fro about 3m- 5m seconds until the  power source is 5V and stable.

    DCP010505USVSUVLO.pdf
  • 0 in reply to Tom Guerin
    Prodigy 60 points

    thank you, you are just right, if I change a Power source, the situation get better,that problem nearly dont happened.the current is about 200mA.

    thank you again.