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Hi Cao,
I think you could see TI's UCC38C43 which has 50uA typical startup current also.
The TI's UCC38C43 , UC3843 and other vendor's XX3843 are pin to pin compatible however they have small difference in particular items such as startup current, Vdd max, etc..
If you need anything help , please let me know.
Br
Kening