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  • TI Thinks Resolved

TPS65130: Heating Issue

Intellectual 370 points

Replies: 3

Views: 96

Part Number: TPS65130

Hello,

We are using the TPS65130 dual supply boost regulator and we have followed the datasheet & EVM guide schematics.
 
We have designed for +9V and -9V outputs, but the +9V is not coming proper, it's coming around +2V.  Inverting o/p -9V is coming correct.
 
At loading condition(at max 150mA), IC is heating up and not working fine.
 
Please find the attachment of the schematic and I request you to provide the solution.
 
 
Thanks & Regards,
Rudra Prakash
  • Hello Rudra,

    I reviewed your design and I do not see a problem schematically. So it could perhaps be some board assembly issue. Another possible cause could be the connection between different grounds on the board since you have them separated on the board and connected through ferrite beads. I would suggest to try connecting them through hard-wire at various points on the board to see this changes the behavior in any way. If not, I would focus on checking board assembly to debug this further.

    Kind Regards,

    Liaqat

     

  • In reply to Liaqat Khan:

    Hello Liaqat,

    The issue is still not solved. Please check the layout and kindly provide your valuable suggestions.

    Thanks & Regards,

    Rudra Prakash

  • In reply to Rudra Prakash:

    Hello Rudra,

    As I had suggested earlier, schematically I don't see any problem that should cause 2V for boost output instead of 9V. So it could be some board assembly issue and perhaps the device is not soldered properly. So you will have to check and debug that on your end. I do not see the bottom layer copper in the layout so it is hard for me to see how the two GND islands are connected. As an experiment, I suggest to replace ferrite bead FB1 with a solid wire and also connect AGND and GND together at many other points on the board to see if makes any difference.

    Kind Regards,

    Liaqat

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