Can't find datasheet of IC "DAS05"

[jaipursky]

Working on a Lenovo Laptop SMPS Power Supply and cannot find data sheet for this IC
Its used in secondary section of the supply. Marking on the IC are below. Its 8 pin SMD. See Picture part number IC101.
DAS05
S967518
TnD0401

This IC is located near an Optocoupler and its driving it. In the first attempt it appears like an OpAmp but I am not 100% sure.

Similarly there is another 6 pin IC with making "DAS2".

Where can I find Datasheet for them? appreciate any help.

[AhmedAbuShamla]

if its near photocoupler then its probably like tl431 which regulates power using a voltage divider resistors