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TPS54060EVM-590: Why +-voltages not symmetric?

Part Number: TPS54060EVM-590
Other Parts Discussed in Thread: TPS54060, TPS54060A


I use the design shown in TPS54060EVM-590, I have different values for resistors and capacitors (I used WEBENCH to calculate), as I need a +-17V supply.

Basically, all works fine, but what I see is that the + and - voltages are not symmetric. Most devices show +-0.2V deviation, so for example +16.8V and -17.2V. Some have much higher differences, even more than +-0.5V. As this is rather high, I have to look into, but I do not see what influences this. Could you please give me a hint?

Thanks & Regards