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| STR-W6700 General Descriptions Series Power IC for Quasi-Resonant Type Switching Power Supply with High Efficiency and Low Noise in Full Load Range The STR-W6700 series products are power ICs for quasi-resonant type switching power supplies, incorporating a power MOSFET and a controller IC, The product achieves high efficiency and low noise power supply systems by the quasi-resonant operation and the bottom-skip quasi-resonant operation. The STR-X6700 series products are the different package (TO-3PF) versions. Features Multi-Mode Control The operation mode switching with three steps according to load conditions achieves the TO-220F-6 optimal high efficiency and low noise power supply systems across the full load range. (The confirmation of product number is necessary because some functions are different in each product.) In Standby (Under Standby Load Conditions): UVLO Intermittent Oscillation by lowering output voltage --- Switched by Standby Signal, or Auto Burst-Oscillation --- Switched Automatically 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 PWM Oscillator The PWM operates with the minimum frequency of around 22 kHz, until the quasi-resonant signal becomes valid, reduces the stress on components at startup and load-shorted. Soft-Start Function Step-Drive Function, reducing switching noise Built-in Maximum ON Time Limitation Circuit The function limits the maximum ON time of power MOSFET, during the transitions at low input voltage, power ON/OFF. Input Compensation at Overcurrent The function reduces the distortion of overcurrent operation point to AC input voltage change by adding three components. Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET Various Protections Overcurrent Protection (OCP) -------------------------------- Pulse-by-Pulse Overload Protection (OLP)-------------------------------------- Latch Shutdown Overvoltage Protection (OVP) -------------------------------- Latch Shutdown Applications Switching Power Supplies for Digital Consumer Equipment; LCD-TVs, PDP-TVs, CRT-TVs, etc., Home Appliances, OA Equipments, Industry Machines, Communication Devices, Others Product Lineup Product No. MOSFET VDSS MIN (V) RDS(ON) MAX BurstOscillation BottomSkip QR Product No. () MOSFET VDSS MIN (V) RDS(ON) MAX BurstOscillation BottomSkip QR () STR-W6723N STR-W6734 STR-W6735 STR-W6735N STR-W6753 STR-W6754 450 500 500 500 650 650 1.4 1.0 0.57 0.57 1.7 0.96 N Y Y N Y Y Y Y Y Y Y Y STR-W6750F STR-W6756 STR-W6756N STR-W6765 STR-W6765N 650 650 650 800 800 0.73 0.73 0.73 1.8 1.8 Y Y N Y N N Y Y Y Y Y: Including the function N: Excluding the function 2010/08 Typical Application Circuit VAC ErrAmp +B STR-W6700 1 D Vcc 4 GND Standby ON/OFF Signal UVLO Intermittent Oscillation Circuit Example Low B Reg FB Cont Standby VOUT GND 6 S/GND OCP/BD SS/OLP 3 7 5 Reg Linear Regulator IC from Sanken, Others Typical Operation Waveforms Transitions between Bottom-Skip QR Operation and Quasi-Resonant Operation Load Change Light Bottom1 Bottom-Skip QR QR ID VDS Frequency fOSC (kHz) Heavy 140 120 100 80 60 40 20 0 STR-W6700 Input Power - Frequency 100VAC Vin(AC) = 100V 1Skip QR 0 50 100 150 200 250 Input Power PIN (W) 240VAC Vin(AC) = 240V 140 Frequency fOSC (kHz) 120 100 80 60 40 20 0 0 50 100 150 200 250 1Skip Input Power PIN (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 |
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