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LM5060: UVLO after power up

Part Number: LM5060

Tool/software:

Hi, I'm using an LM5060 and the UVLO appears to work correctly on power-up (i.e. I have it set to around 42V, and device doesn't power up if input voltage is below that). However if I power it up with e.g. 46V, and then dial down the input voltage below the UVLO limit, I don't get a fault condition, it carries on working. The block diagram on page 11 of the datasheet suggests that the UVLO feeds into some logic that should turn off the gate drive if below the 1.6V threshold, but I'm not seeing that in real life.