This part is a kind of semiconductor called LY9525.

Function of this product has Current mode PWM controller.

Manufacturers : Strong Link Electronics

Image and pinout :

Some of the text within the PDF file :

, Ko ng ,.L Shen Zhen Strong Link Electronics c( Ho LY9523/LY9525/LY9526/LY9527/LY9528 ng (H o GENERAL DESCRIPTION nic tro controller MOSFET. with integr ated hig h voltag e po wer gK ,.L t combines a dedicate d curre nt mode PW M on d. Co g) DIP8-300-2.54 LY952 3/LY 952 5/LY95 26/LY95 27 /LY9528 g) Co ,.L LY9523/LY9525/LY9526/LY9527/LY9528 Ko n td. Current mode PWM controller with integrated high voltage power MOSFET ec El design wit h LY952 3/ LY952 5/LY 952 6/LY95 27/ LY95 28 . the IC operates in Extend ed gK on nic tro ‘burst mod e’ to minimize switching loss. Low er standb y po we r and hi gh er (H El ike Ma tro Soft Start with 4mS,LY9523/LY 9 525/LY9 52 6/LY952 7/ LY952 8 offers complete gK Excellent EMI perfor mance is achieve d wi th p [ ... ]

LY9525 PDF Datasheet Download