This post explains for the semiconductor KA7552.
The Part Number is KA7552.
The function of this semiconductor is PWN CONTROLLER.
Manufacturers : Samsung
Preview images :
KA7552 Industrial CD-ROM(Edition 3.0) This Data Sheet is subject to change without notice. Page : 1
The KA7552 is switching power control IC for wide operating frequency range. The internal circuits include pulse by pluse current limiting, protection, on/off control by external trigger, low standby current, soft start, and high current totempole output for driving a Power MOSFET.[…]