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LM3429BKBSTEVAL: LM3429BKBSTEVAL board turn on problem at 6V

Part Number: LM3429BKBSTEVAL

Dear Sir

I  want to use LM3429BKBSTEVAL board at 6V Vin.

LED current is 1A, Vf=3.4 but it did not work, never turn on.

I didn't change ahy parts in EVM board. I just supply 6V to Vin but LED did not turn on.

When I supply more than 10V, then LED was turn on.

What's the problem?