STR-W6756 Data Sheet 28103.33* ih ng rs tc lato i Sw egu R Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator ABSOLUTE MAXIMUM RATINGS at TA = +25°C Control Supply Voltage, VCC . . . . 35 V Drain-Source Voltage, VDSS . . . . . . 650 V Drain Switching Current, ID . . . . . 15 A* Peak Drain Switching Current, IDM . . . . . . . . . . . . . . . . . . . . . . 15 A Single-Pulse Avalanche Energy, EAS . . . . . . . . . . . . . . . . . . . 400 mJ OCP/BD Voltage Range, VOCP . . . . . . . . . . . . –1.5 V to +5 V FB Input Current, IFB . . . . . . . . 10 mA FB Voltage Range, VFP –0.5 V to +9 V Package Power Dissipation, PD control (VCC × ICC(ON)) . . . . . . 0.8 W MOSFET (VDSS × ID) . . . See Graph MOSFET Channel Temp., TJ . +150°C Internal Frame Temp., TF . . . . +115°C Operating Temperature Range, TA . . . . . . . . . . . -20°C to +115°C† Storage Temperature Range, TS . . . . . . . . . . . . -40°C to +125°C * Drain switching current is limited by temperature (page 2) and safe operating area (page 5). †For the availability of parts meeting -40°C requirements, contact Allegro’s Sales Representative. The STR-W6756 is a quasi-resonant regulator specifically designed to satisfy the requirements for increased integration and reliability in switch-mode power supplies. It incorporates a primary control and drive circuit with an avalanche-rated power MOSFET. The regulator exhibits only low-level high-frequency EMI noise because of soft switching of the MOSFET close to ground (bottom point). A bottom-skip function minimizes an increase of operational frequency during light loads to improve system efficiency over the entire load range. Covering the power range from below 240 watts for a 230 VAC input, or 140 watts for a universal input (85 to 264 VAC), this device can be used in a range of applications, from DVD and VCR players to ac adapters for cellular phones and digital cameras. An auto-standby function, which is internally triggered by sensing on time, reduces power consumption at light load. An externally triggered standby mode reduces the input power further. Multiple protections, including the avalanche-energy-guaranteed MOSFET, provide high reliability of system design. Cycle-by-cycle current limiting, undervoltage lockout with hysteresis, and overvoltage protection protect the power supply during the normal overload and fault conditions. Overvoltage protection is latched after a short delay. The latch may be reset by cycling the input supply. Low start-up current and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features. The STR-W6756 is provided in a fully molded TO-220-style flangemounted, high power, isolated plastic package. FEATURES AND BENEFITS ■ Rugged 650 V Avalanche-Rated MOSFET Simplified Surge Absorption No VDSS Derating Required ■ 0.73 Ω Maximum rDS(on) ■ Two Operational Modes by Automatic Switching: Quasi-Resonant Mode for Normal Operation Burst Mode for Standby Operation or Light Loads ■ Automatic or Manually Triggered Burst Standby Input Power <0.1 W at No Load ■ Low Operating Current (6 mA typ) — continued Always order by complete part number, e.g., STR-W6756 . Sanken Power Devices from Allegro MicroSystems ih ng rs tc lato i Sw egu R STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator FUNCTIONAL BLOCK DIAGRAM FEATURES AND BENEFITS (cont’d) ■ Auto-Bias Function Stable Burst Operation Without Generating Interference ■ Internal Off-Timer Circuit ■ Built-In Constant-Voltage Drive ■ Multiple Protections: Pulse-by-Pulse Overcurrent Protection Overload Protection with Auto Recovery Latching Overvoltage Protection Undervoltage Lockout with Hysteresis ■ RoHS Compliant 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Copyright © 2005 Allegro MicroSystems, Inc. ih ng rs tc lato i Sw egu R STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 20 V, voltage measurements are referenced to S/GND terminal (unless otherwise specified). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Operation Start Voltage VCC(ON) Turn-on, VCC = 0 19.9 V 16.3 18.2 19.9 V Soft-Start Operation Stop Voltage VSS/OLP 1.1 1.2 1.4 V Soft-Start Oper. Charging Current ISS/OLP -390 -550 -710 µA 8.8 9.7 10.6 V Start-Up Operation Operation Stop Voltage VCC(OFF) Turn-off, VCC = 19.9 8.8 V Circuit Current in Non-Operation ICC(OFF) VCC = 15 V – – 100 µA V(BR)DSS ID = 300 µA 650 – – V IDSS VDS = 650 V – – 300 µA ID = 2.2 A, TJ = +25°C – – 0.73 Ω Normal Operation Drain-Source Breakdown Voltage Drain Leakage Current On-State Resistance rDS(on) Switching Time tf – – 400 ns Circuit Current ICC(ON) – – 6.0 mA fosc 19 22 25 kHz VOCPBD(BS1) -605 -665 -720 mV VOCPBD(BS2) -385 -435 -485 mV VOCPBD(TH1) 280 400 520 mV VOCPBD(TH2) 670 800 930 mV VFB(OFF) 1.32 1.45 1.58 V IFB(ON) 600 1000 1400 µA 10.3 11.1 12.1 V 1.10 1.35 1.65 V Oscillation Frequency Bottom-Skip Oper. Threshold Volt. Quasi-Resonant Oper. Threshold Feedback-Pin Threshold Voltage Feedback-Pin Current Standby Operation VCC = 0 12.2 V Standby Operation Start Voltage VCC(S) Standby Oper. Start Volt. Interval VCC Standby Non-Operation Current ICC(S) VCC = 10.2 V – 20 56 µA Feedback-Pin Current IFB(ON) VCC = 10.2 V – 4.0 14 µA Feedback-Pin Threshold Voltage VFB(S) VCC = 12.2 V 0.55 1.10 1.50 V Minimum ON Time ton(min) 0.5 0.8 1.2 µs continued next page ... www.allegromicro.com 3 ih ng rs tc lato i Sw egu R STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 20 V, voltage measurements are referenced to S/GND terminal (unless otherwise specified). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units VCC(OVP) Turn-off, VCC = 0 29.9 V 25.5 27.7 29.9 V Protection Operation OVP Operation Voltage Maximum ON Time ton(max) 27.5 32.5 39.0 µs OLP Operation Voltage VSSOLP 4.0 4.9 5.8 V OLP Operation Current ISSOLP -6.0 -11 -16 µA Overcurrent Detect. Threshold Volt. VOCPBD(LIM) -0.895 -0.940 -0.995 OCP/BD-Pin Current IOCPBD Latch Holding Current ICC(H) VCC = 29.9 VCC(OFF) – 0.3 V Latch Release Voltage VCC(L) VCC = 29.9 6 V V -40 -100 -250 µA – 45 140 mA 6.0 7.2 8.5 V – – 1.5 °C/W Other Thermal Resistance RθJF Output junction-to-frame NOTES: 1. Typical Data is for design information only. 2. Negative current is defined as coming out of (sourcing) the specified device termninal. 4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 ih ng rs tc lato i Sw egu R STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator MOSFET TYPICAL CHARACTERISTICS Avalanche energy is measured at VDD = 99 V, L = 20 mH, IL = 6.05 A. www.allegromicro.com 5 STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator ih ng rs tc lato i Sw egu R MOSFET TYPICAL CHARACTERISTICS (cont’d) WARNING — These devices are designed to be operated at lethal voltages and energy levels. Circuit designs that embody these components must conform with applicable safety requirements. Precautions must be taken to prevent accidental contact with power-line potentials. Do not connect grounded test equipment. The use of an isolation transformer is recommended during circuit development and breadboarding. 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 ih ng rs tc lato i Sw egu R STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator APPLICATIONS INFORMATION Typical Application Complete product description and applications information is provided in Application Note 28103.30, Series STRW6750 Off-Line Quasi-Resonant Flyback Switching Regulators. The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Their use in any application requiring radiation hardness assurance (e.g., aerospace equipment) is not supported. Sanken and Allegro reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Therefore, the user is cautioned to verify that the information in this publication is current before placing any order. When using the products described herein, the applicability and suitability of such products for the intended purpose shall be reviewed at the users responsibility. Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to society due to device failure or malfunction. When considering the use of Sanken products in applications where higher reliability is required (transportation equipment and its control systems or equipment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written confirmation of your specifications. The use of Sanken products without the written consent of Sanken in applications where extremely high reliability is required (aerospace equipment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited. The information included herein is believed to be accurate and reliable. Application and operation examples described in this publication are given for reference only and Sanken and Allegro assume no responsibility for any infringement of industrial property rights, intellectual property rights, or any other rights of Sanken or Allegro or any third party that may result from its use. EI16EI www.allegromicro.com 7 STR-W6756 Universal-Input/140 W Off-Line QuasiResonant Flyback Switching Regulator PACKAGE DIMENSIONS in Millimeters Product weight: approx. 2.3 g. Recommended mounting hardware torque: 0.588 ~ 0.785 Nm, 6 ~ 8 kgf × cm. Recommended silicon grease: Dow Corning SC102, Toshiba YG6260, Shin-Etsu G746, or equivalent. 8 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 ih ng rs tc lato i Sw egu R