This part is a kind of semiconductor called KA7500.

Function of this product has single monolithic chip.

Manufacturers : HUAFUQIN

Image and pinout :

Some of the text within the PDF file :

SHENZHEN HUAFUQIN ELECTRONICS CO.,LTD KA7500 KA7500 KA7500 http://www.hfq123.com 1 REV: A0 2009-12-1 SHENZHEN HUAFUQIN ELECTRONICS CO.,LTD KA7500 http://www.hfq123.com 2 REV: A0 2009-12-1 SHENZHEN HUAFUQIN ELECTRONICS CO.,LTD KA7500 http://www.hfq123.hqew.com 3 REV: A0 2009-12-1 SHENZHEN HUAFUQIN ELECTRONICS CO.,LTD KA7500 http://www.hfq123.com 4 REV: A0 2009-12-1 SHENZHEN HUAFUQIN ELECTRONICS CO.,LTD Typical Application Pulse Width Modulated Step-down Converter VI=10V to 40V KSA1010 47Ω 150Ω 0.1uF 1MΩ 12 Vcc 11 C2 83 C1 COMP INPUT -2 VREF 14 KA7500 - 15 +1 D.T GND E1 E2 O.C 4 7 9 10 13 + 50uF 50V RT CT +16 65 + 47kΩ 0.001uF KA7500 1mH,2A Vo=5V Io=1A 5.1kΩ 50uF 10V 5.1kΩ 150Ω 5.1kΩ + 50uF 10V GND 0.1 http://www.hfq123.com 5 [ ... ]

KA7500 PDF Datasheet Download