This part is a kind of semiconductor called BD9897FS.

Function of this product has DC-AC Inverter Control IC.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

1/4 STRUCTURE NAME OF PRODUCT TYPE FUNCTION Silicon Monolithic Integrated Circuit DC-AC Inverter Control IC ＢＤ９８９７ＦＳ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 36V High voltage process 1ch control with Full-Bridge Lamp current and voltage sense feed back control Sequencing easily achieved with Soft Start Control Short circuit protection with Timer Latch Under Voltage Lock Out Mode-selectable the operating or stand-by mode by stand-by pin Synchronous operating the other BD9897FS IC’s BURST mode controlled by PWM and DC input Output liner Control by external DC voltage ○Absolute Maximum Ratings（Ta = 25℃） Parameter Supply Voltage BST pin SW pin BST-SW voltage difference Operating Temperature Range Storage Temperature Range Maximum Junction Temperature Power Dissipat [ ... ]

BD9897FS PDF Datasheet Download