This part is a kind of semiconductor called STR-Z2589.

Function of this product has STR-Z2500 Series Power IC.

Manufacturers : Sanken

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Some of the text within the PDF file :

STR-Z2500 ■ General Descriptions Series Power IC for Current Resonant Type Switching Power Supply with Half-Bridge Resonance, High Efficiency and Low Noise The STR-Z2500 series products are power ICs for current resonant type switching power supplies, incorporating a controller IC including high-side and low-side MOSFETs of half-bridge type resonance and a floating-drive circuit. The product achieves high efficiency and low noise power supply systems by the ZVS and ZCS. The product is recommended for high-efficiency small and standardized power supplies because of easy circuit designs with few external components. ■ Features SIP-24 Soft-Switched Multi-Resonant Zero Current Switch (SMZ) The zero-current switching (ZSC) and zero-voltage switching (ZVS) of half-bridge type resonance a [ ... ]

STR-Z2589 PDF Datasheet Download