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TL5001A: TL5001A does not start

Part Number: TL5001A
Other Parts Discussed in Thread: TL5001

Good evening,

I use for a long time TI controller to make DC conversion. On my last PCB, I use a TL5001A but I think I have done a mistake somewhere as this controller starts if and only if I put a ground on SCP pin. After TL5001 has started, it runs as expected.

My test circuit is http://www.systella.fr/tl5001.pdf

Input : 24Vac, 50Hz

No load.

I have tried to modify C13 (until 100uF !) without any result.

Before posting here, I have redone twice all computations and I don't understand where is my mistake.

Help will be welcome.

Best regards,

JB