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TPS61021A high load startup problem

Other Parts Discussed in Thread: TPS61021A

I've designed a boost converter with TPS61021A using webench. See webench report: mustafaakdeniz.com/webench_design_4698329_19_26840312.pdf (1.8-3V input,1A@3.3V output) I bought samples and started working with circuit.

When I connect low load and slowly increase it there is no problem. However when circuit start with load resistor smaller than ~10ohms (Iout>330mA) output voltage hangs at ~0.6-0.7V. If I decrease the load it starts working again.

How can I start this circuit with high load (~1Amp)?