This part is a kind of semiconductor called THX202.

Function of this product has PWM switching power supply controller.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

THX202 3:0 ᥻ࠊ఼ ϔǃὖẴ˖ ʌᗻ࿁Ϲ⌕῵ᓣ ᥻ࠊ఼DŽϧЎʌᗻӋ↨ Ḱᤶ఼᪂ᩥDŽ೼ ՈᆑϹय़ᇇೈ ‫ᦤݙ‬կʌẂ ՈẢනṗߎࡳɋDŽӬ࣪Ոʌড়ˊᗻՈϹᲳ᪂ᩥ඗ড়ʌᗻ࿁ӋḐ↨Ոঠᵕൟࠊ԰Ꮉ ᄾˈ᳔໻࣏ᑺϞᅆ൪њѻકՈᭈԧ៤ᴀDŽ᪩Ϲ⑤᥻ࠊ఼ৃᎹ԰Ѣ‫݌‬ൟՈড▔ϹᲳᢧᠥЁˈᵘ៤੄ ⋕Ո Ḱᤶ఼DŽ ‫ݙ‬ᾬՈਃࡼϹᲳᝯ᪂ᩥ៤ϔ࢑ưĽՈϹ⌕਌ܹᮍᓣˈৃ߽Ϭࡳɋᓔ݇੥ᴀ ᵯՈᬒ໻԰Ϭᅠ៤ਃࡼˈẝᰒጛഄ┑ԢњਃࡼϹ⓿Ոࡳɋ⍜໛˗໐೼ṗߎࡳɋṇᇣᯊ ᇚႮࡼ┑ ԢᎹ԰EɋˈҢ໐ᅲɴњᵕԢՈᕙᴎࡳ໛DŽ೼ࡳɋ੥៾ℶᯊˈ‫ݙ‬ᾬϹᲳᇚࡳɋ੥ড৥‫أ‬าˈָ᥹ ߽Ϭњঠᵕᗻ᱊ԧ੥Ո ʌ໔य़Ľᗻˈ໻ᐙᦤʌࡳɋ੥Ո໔Ϲय़࿁࡯ָࠄ Ոʌय़ˈẝֱ᪅ њ [ ... ]

THX202 PDF Datasheet Download