STR-Y6700 Series Power IC for Quasi-Resonant Mode Switching Power Supplies with Low Standby Power, High Efficiency and Low Noise in Full Load Range ■ General Descriptions The STR-Y6700 series products are power ICs for quasi-resonant (QR) switching mode power supplies, incorporating a power MOSFET and a controller IC. The product achieves high efficiency and low noise systems, by automatic switching of Auto-Standby operation under light load conditions, QR operation and Bottom-Skip QR operation in normal operation. The product easily achieves high cost-performance power supply systems with few external components. TO-220F (FMY207) ■ Features Multi-Mode Control The automatic operation mode switching with three steps according to load conditions achieves the optimal power supply systems with high efficiency and low noise across full load range. ・In Standby------------------------------------------------------ Auto Standby Operation ( Burst-Oscillation) ・Under Low to Middle Load Conditions ------------------- Bottom-Skip Quasi-Resonant Operation (Bottom-Skip QR) ・Under Middle to Rating (or Heavy) Load Conditions -- Quasi-Resonant Operation (QR) Current-Mode Control Built-in Startup Circuit, enabling Low Power Consumption Auto-Standby Function with burst-oscillation, enabling low standby power Input Power at no load : PIN < 30mW (100VAC), PIN < 50mW (240VAC) Soft-ON Function, preventing the audible noise from transformer at standby (Burst-Oscillation) Built-in Soft-Start Function Built-in Bias Assist Function Overcurrent Protection (OCP) with AC Input Compensation Function Built-in Leading Edge Blanking Function Built-in High-Voltage Power MOSFET with Avalanche Energy Guaranteed Protection Functions ・Overcurrent Protection (OCP) --------------- Pulse-by-Pulse ・Overload Protection (OLP)------------------- Latch Shutdown ・Overvoltage Protection (OVP) -------------- Latch Shutdown ・Thermal Shutdown Protection (TSD) ------ Latch Shutdown ■ Applications Switching Power Supplies for Digital Consumer Equipments: LCD-TVs, BD / DVD Players / Recorders, etc., Home Appliance (White Goods), OA Equipments, Industry Machines, Communication Equipments, Others ■ Product Lineup Product No. STR-Y6735 STR-Y6753 STR-Y6754 MOSFET VDSS (MIN) (V) RDS(ON) (MAX) 500 0.8 1.9 1.4 650 (Ω) Product No. MOSFET VDSS (MIN) (V) STR-Y6763 STR-Y6765 STR-Y6766 800 RDS(ON) (MAX) (Ω) 3.5 2.2 1.7 2010/08 ■ Typical Application Circuit Vout VAC STR-Y6700 1 Vcc Cont． 2 GND 3 D/ST S/OCP BD 6 FB /OLP 5 NF 7 GND 4 ■ Typical Operation Waveforms and Electrical Characteristics Operation Mode Transitions Max. Load Min. Load ID VDS Standby (Burst-Oscillation Operation) Bottom-Skip Quasi-Resonant 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 AC100V 100VAC 240VAC AC240V PIN < 30mW (100VAC, No Load) PIN < 50mW (240VAC, No Load) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Output Power POUT (W) Efficiency η (%) Input Power PIN (W) Reference: Efficiency Characteristics (Wide Input, 70W Power Supply) 100 90 80 70 60 50 40 30 20 10 0 AC100V 100VAC AC240V 240VAC 0 10 20 30 40 Output Power 50 60 70 80 POUT (W) 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. 2010/08