• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 38 subscribers
  • Views 381 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.

PMP41106: OLP without load connected

HW_engineer_5678
Prodigy 85 points

Part Number: PMP41106
Other Parts Discussed in Thread: TL103W

Tool/software:

Hello, I've followed the PMP41106 to design a battery charger with 52V output. But when I powered up it seems to be triggering OLP even if there is no load.

Reviewing the schematics I've seen that when the current is below IREF, the output of U7B will be always 10V. That means that the optocoupler U3 won't conduct.

The datasheet specify that when the Iopto is 0uA the FBreplica is maximum and this triggers the OLP. Can you help me to see if I'm missing something?

  • 0
    TI__Prodigy 581 points

    Hi,

    Do you power up with the electrical load with CR mode? Do you check the voltage of U7A？In addition, the TL103W offers the internal 2.5V reference from PIN3 of U7A, you need to notice the correct voltage of Iref in the schematic.

    Regards,