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TPS43061: Regulation does not work

Part Number: TPS43061
Other Parts Discussed in Thread: TPS43060

I have a problem with the TPS43061. I had the circuit designed by webench (55V/2,5A). But the correct output voltage of 55V is only available at minimum load, as soon as the power is increased the voltage at the output drops below 40V. The FB voltage is below 0.8V, but it is not adjusted to 1.22V.