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TPS65130: Difference between data sheet and EVM

Peter Paquette
Prodigy 10 points
Part Number: TPS65130

I tried to follow the data sheet and create a circuit based on the TPS65130.

I wanted two rails +12V and -12V from a 5.0V supply.

My schematic (witch matches data sheet - also included in photo at bottom) is :

From the EVM:

The schematic from the EVM:

1) ENP/PSP/ENN/PSN are all directly connected to Vin signal in the EVM (not the VIN pin).  In the data sheet they are after the 100 ohm resistor and tied to the VIN pin.  which is correct?

2) The negative feedback in the EVM has an extra 10K resistor (R5) that is not shown in the reference design (No resistor in series with C10, parallel to R3).

I currently get < 1.0V on +12V rail and 0.4V on -12V rail.  

My layout follows very closely the layout for the EVM, minus the schematic differences noted above in 1) and 2).

  • 0
    TI__Intellectual 1965 points

    Hi Peter,

    Thanks for your question. Let me contact the expert for this part. You can expect a response by 2/14/20.

    Best,

    Grant

  • 0
    TI__Mastermind 18550 points

    Hello Peter,

    Either way of connecting ENP/PSP/ENN/PSN should work fine.

    In some PCB designs, we have seen excessive noise coupling into the feedback pins (FBN/FBP) and that is the reason for adding a resistor in series with the feed forward capacitors C6 and C9. You can add these resistors by lifting one side of the capacitors on the PCB to see if this improves the behavior.

    It is also possible that there is a board assembly issue causing the output voltages to be off like that. Is it only one board or do you have few boards exhibiting this problem?

    Kind Regards,

    Liaqat