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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.
Features
TO-220F-7
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. STR-Y6453 650 STR-Y6456 STR-Y6473 850 STR-Y6476 1.3 0.73 3.6 MOSFET VDSS(MIN) (V) RDS(ON)(MAX) () 1.8
Typical Application Circuit
VAC
VOUT
STR-Y6400
1 D/Startup 3
GND
Vcc BD 5
Cont
FB ADJ
4 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
Efficiency Comparison of Multi Mode vs. Quasi-Resonant Mode
100 90 80 70 60 50 40 30 20 10 0 0.0 1.0 2.0 3.0 4.0 5.0 AC120V STR-Y6476 120VAC STR-Y6476 230VAC STR-Y6476 AC230V STR-Y6476 120VAC QR AC120V QR 230VAC QR AC230V QR 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30
[%] Efficiency (%)
[%] Efficiency (%)
Efficiency Improvement
Efficiency Improvement
AC120V STR-Y6476 120VAC STR-Y6476 230VAC STR-Y6476 AC230V STR-Y6476 120VAC QR AC120V QR 230VAC QR AC230V QR
Output Power POUT (W) Po Po[ Po [ W ]
Output Power PW ] (W) Po Po[ Po [ OUT
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.

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