This part is a kind of semiconductor called MR1722.

Function of this product has (MR1xxx) Partial Resonance PS IC.

Manufacturers : Shindengen Electric

Image and pinout :

Some of the text within the PDF file :

MR1000 Vz /c 4 5 ID Vin=100V 12V : 3.5A Limit : [VCCI] Class2 150kHz 30MHz 100 R Q S VDS 80 60 1 40 IDP 20 ID 0 0.15 0.3 0.5 1 3 5 MHz 10 30 S Q R S VOUT Standby Vin=100V 42W 12V, 3.5A 2 ON 3 VCC 100 80 60 40 20 0 0 1 2 W 3 L N FG +12V VZ/C VGS ID 2 IG Vin=100V 100 80 60 40 20 0 42W 12V, 3.5A GND MR1000 2 5 4 1 3 ID 0 10 20 30 W 40 VDS [V] NEW MR1501 Po [ W ] AC85 132V 12 AC180 264V AC85 264V 3.2 10.0 0.2 0.2 0.1 (Peak20) MR1511 500 MR1521 NEW MR1531 (Peak40) (Peak80) 25 50 4.5 0.2 2.7 0.2 0.2 15.0 MR1722 (Peak80) (Peak40) 2.7 1.9 0.2 0.3 17.0 0.7 4-1.7 0.3 0.1 0.95 0.3 0.1 0.5 0.3 0.1 0.3 2.65 6.75 0.5 0.3 1 2 3 4 5 1 0 1 0 1 0 0 0 4.2 0.3 19.6 50 25 15.0 [ ... ]

MR1722 PDF Datasheet Download