STR-Y6400 Series Power IC for Quasi-Resonant Type Switching Power Supply with High Efficiency, Low Noise and Low Standby Power in Full Load Range ■ General Descriptions The STR-Y6400 series products are power ICs for quasi-resonant switching type power supplies, incorporating a power MOSFET and a controller IC. The product achieves high efficiency and low noise power supply systems across the full load range, by the low standby power, the quasi-resonant operation, the bottom-skip quasi-resonant operation, and the burst-oscillation. The STR-L6400 series products are the different package (SIP-10) versions. TO-220F-7 ■ Features Multi-Mode Control The operation mode switching with four steps according to load conditions achieves the optimal high efficiency and low noise power supply systems across the full load range. ・In Standby: Auto Standby (Auto Burst-Oscillation) ・Under Low to Middle Load Conditions: 1 or 2 Bottom-Skip Quasi-Resonant Operation (Bottom-Skip QR) ・Under Middle to Rating (or Heavy) Load Conditions: Quasi-Resonant Operation (QR) Current-Mode Control Bottom-Skip Function with Delay Time Setting, enabling stable switching Built-in Startup Circuit, enabling low power consumption Auto-Standby Function with Burst-Oscillation, enabling low standby power(Input power PIN < 100mW at no load) Soft-ON Function, preventing the audible noise from transformer, during the standby operation (burst-oscillation) and the dynamic load change. Soft-Start Function Step-Drive Function, reducing switching noise Leading Edge Blanking Function External ON/OFF Function Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET Various Protections Overcurrent Protection (OCP)-------- Pulse-by-Pulse with AC Input Compensation Function Overload Protection (OLP) ----------- Latch Shutdown or Auto-Restart Option by changing external components Overvoltage Protection (OVP) ------- Latch Shutdown ■ Applications Switching Power Supplies for Digital Consumer Equipment; LCD-TVs, BD/DVD Players/Recorders, etc., Home Appliance (White Goods), OA Equipments, Industry Machines, Communication Devices, Others ■ Product Lineup Product No. MOSFET VDSS(MIN) (V) STR-Y6453 RDS(ON)(MAX) (Ω) 1.8 650 STR-Y6456 0.73 STR-Y6473 3.6 850 STR-Y6476 1.3 ■ Typical Application Circuit VAC VOUT STR-Y6400 1 3 D/Startup GND Vcc BD 5 Cont． FB 4 ADJ 7 2 S/GND 6 OCP ■ Typical Operation Waveforms & Typical Electrical Characteristics Operation Mode Transitions Minimum Load Maximum Load VDS ID Standby (Burst-Oscillation) 2 Bottom-Skip 1 Bottom-Skip Quasi-Resonant 100 100 90 90 80 80 70 70 効率 効率η ηη(%) [%] Efficiency 効率 効率η ηη(%) [%] Efficiency Efficiency Comparison of Multi Mode vs. Quasi-Resonant Mode 60 AC120V 120VAC STR-Y6476 STR-Y6476 230VAC STR-Y6476 STR-Y6476 AC230V 120VAC QR AC120V QR 擬似共振 230VAC QR AC230V QR 擬似共振 50 Efficiency Improvement 40 30 20 10 60 AC120V STR-Y6476 STR-Y6476 120VAC 230VAC AC230V STR-Y6476 STR-Y6476 120VAC QR AC120V QR 擬似共振 230VAC QR AC230V QR 擬似共振 Efficiency Improvement 50 40 30 20 10 0 0 0.0 1.0 2.0 3.0 4.0 Output Power 出力電力Po Po[ W ] (W) 出力電力 PoP[OUT 5.0 0 5 10 15 20 25 30 Output Power OUT 出力電力Po Po[ [W ] (W) 出力電力 PoP Warning The contents in this document are subject to changes, for improvement and other purposes, without notice. Make sure that this is the latest version of the document before use. The operation and circuit examples in this document are provided for reference purposes only. Sanken assumes no liability for violation of industrial property, intellectual property, or other rights of Sanken or third parties, that stem from these examples. The user must take responsibility for considering and determining which objects the products in this document are used with. Although Sanken will continue to improve the quality and reliability of its products, semiconductor products, by their nature, have certain fault and failure rates. The user must take responsibility for designing and checking to secure the device and system so that a part failure may not lead to human injury, fire, damages, or other losses. The contents in this document must not be transcribed or copied without Sanken’s written consent. SANKEN ELECTRIC CO.,LTD.