STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Features and Benefits Description • TO–220F–7L package • Lead (Pb) free compliance • The built-in startup circuit reduces the number of external components and lowers standby power consumption • Multi-mode control allows high efficiency operation across the full range of loads • Auto burst oscillation mode for standby mode, for improving low standby power at no load: input power < 30 mW at 100 VAC and < 50 mW at 230 VAC • Bottom-skip mode minimizes switching loss at medium to low loads ▪ Internal MOSFET VDSS(min) is 500 V ▪ Internal MOSFET RDS(on)(max) 0.8 Ω • Built-in soft start function reduces stress applied to the incorporated power MOSFET and peripheral components • Step-on burst oscillation minimizes transformer audible noise • Built-in leading edge blanking (LEB) function eliminates external filter components The STR-Y6735 comprises a power MOSFET and a multifunctional monolithic integrated circuit (MIC) controller designed for controlling switch mode power supplies. The quasi-resonant mode of operation, coupled with the bottomskip function, allows high efficiency and low noise at low to high operational levels, while burst oscillation mode ensures minimum power consumption at standby. In order to sustain low power consumption under low load and in standby mode, the controller has built-in startup and standby circuits. This enables output power up to 120 W with a 100 VAC input. The compact 7-pin full mold package (TO220F-7L) reduces board space by requiring a minimum of external components, thus simplifying circuit design. This IC, including various protection functions, is an excellent choice for standardized, compact power supplies. Continued on the next page… Package: 7-Pin TO-220F Not to scale Typical Application T1 PC1 C1 P D1 C2 1 3 D/ST STR-Y6700 VCC CV S/OCP STR-Y6735-DS 7 NF 4 D RBD2 PC1 GND R3 C3 R5 R4 Error Amp GND RBD1 FB / OLP 5 ROCP S C5 R2 DZBD Controller BD 6 Chip (MIC) 2 VOUT D2 VAC C4 CBD The NF pin (No. 7) should be connected to the GND pin (No. 4), which should be at a stable ground potential, to ensure stability of operation. STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Features and Benefits (continued) • Built-in Bias Assist function enables stable startup operation • VCC operational range expanded • Internal power MOSFET is avalanche energy guaranteed; twochip structure • Protection functions ▫ Overcurrent protection (OCP): pulse by pulse basis, low dependence on input voltage ▫ Overload protection (OLP): latched shutoff* ▫ Overvoltage protection (OVP): latched shutoff* ▫ Maximum on-time limitation ▫ Thermal shutdown protection (TSD): latched shutoff* *Latched shutoff means the output is kept in a shutoff mode for protection, until reset. Selection Guide Part Number Package Packing STR-Y6735 TO-220F 50 pieces per tube Absolute Maximum Ratings Unless specifically noted, TA = 25°C and VCC = 20 V Characteristic Drain Current1 Maximum Switching Current Symbol Notes Pins Rating Unit IDPEAK Single pulse 1–2 14.6 A IDMAX TA = −20°C to 125°C 1–2 14.6 A Single pulse, VDD = 99 V, L= 20 mH, ILPEAK= 3.5 A 1–2 152 mJ Single Pulse Avalanche Energy2 EAS Input Voltage in Control Part (MIC) VCC 3–4 35 V VSTARTUP 1–4 −1.0 to VDSS V VOCP 2–4 −2.0 to 6.0 V FB Pin Voltage VFB 5–4 −0.3 to 7.0 V FB Pin Sink Current3 IFB 5–4 10.0 mA BD Pin Voltage VBD Startup (D/ST) Pin Voltage OCP Pin Voltage Power Dissipation in MOSFET4 PD1 Power Dissipation in Control Part (MIC) PD2 6–4 −6.0 to 6.0 V With an infinite heatsink 1–2 21.5 W Without heatsink 1–2 1.8 W – 0.8 W – −20 to 115 °C °C Recommended internal frame temperature is TF = 105°C (max). Internal Frame Temperature in Operation TF Operating Ambient Temperature TOP – −20 to 115 Storage Temperature Tstg – −40 to 125 °C Channel Temperature Tch – 150 °C 1Refer to MOSFET Safe Operating Area Curve. to MOSFET Avalanche Energy Derating Coefficient Curve. 3The polarity value for current specifies a sink as "+ ," and a source as “−,” referencing the IC. 4Refer to MOSFET Temperature versus Power Dissipation Curve. 2Refer All performance characteristics given are typical values for circuit or system baseline design only and are at the nominal operating voltage and an ambient temperature, TA, of 25°C, unless otherwise stated. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Functional Block Diagram STR-Y6700 MIC 3 Startup VCC D/ST 1 DRV UVLO Reg/Iconst OCP/BS NF Latch Logic 7 S/OCP FB/STB OLP FB/OLP OSC BD 4 BD 2 5 6 GND Pin List Table Name 1 Number D/ST 2 S/OCP Function MOSFET drain and Startup circuit input MOSFET source and overcurrent detection signal input 3 VCC Control circuit power supply input 4 GND Ground 5 FB/OLP 6 BD Bottom Detection signal input, Input Compensation detection signal input 7 NF For stable operation, connect to GND pin, using the shortest possible path Constant Voltage Control signal input, Standby control, and overload detection signal input Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Electrical Characteristics of Control Part (MIC) Unless specifically noted, TA is 25°C and VCC = 20 V Characteristic Symbol Test Conditions Pins Min. Typ. Max. Unit VCC(ON) 3–4 13.8 15.1 17.3 V VCC(OFF) 3–4 8.4 9.4 10.7 V ICC(ON) 3–4 – 1.3 3.7 mA Power Supply Startup Operation Operation Start Voltage Operation Stop Voltage1 Circuit Current in Operation Circuit Current in Non-Operation ICC(OFF) 3–4 – 4.5 50 μA Startup Circuit Operation Voltage VSTART(ON) 1–4 42 57 72 V Startup Current ICC(STARTUP) VCC = 13 V 3–4 −4.5 −3.1 −1.0 mA VCC(BIAS) 3–4 9.5 11.0 12.5 V Operation Frequency fOSC 1–4 18.4 21.0 24.4 kHz Soft Start Operation Duration tSS 1–4 – 6.05 – ms Bottom-Skip Operation Threshold Voltage 1 VOCP(BS1) 2–4 0.487 0.572 0.665 V Bottom-Skip Operation Threshold Voltage 2 VOCP(BS2) 2–4 0.200 0.289 0.380 V Quasi-Resonant Operation Threshold Voltage 12 VBD(TH1) 6–4 0.14 0.24 0.34 V Quasi-Resonant Operation Threshold Voltage 22 VBD(TH2) 6–4 – 0.17 – V Maximum Feedback Current IFB(MAX) 5–4 −320 −205 −120 μA VFB(STBOP) 5–4 0.45 0.80 1.15 V Maximum On-Time tON(MAX) 1–4 30.0 40.0 50.0 μs Leading Edge Blanking Time tON(LEB) 1–4 – 455 – ns Overcurrent Detection Threshold Voltage (Normal Operation) VOCP(H) VBD = 0 V 2–4 0.820 0.910 1.000 V Overcurrent Detection Threshold Voltage (Input Compensation in Operation) VOCP(L) VBD = –3 V 2–4 0.560 0.660 0.760 V Overcurrent Detection Threshold Voltage (Latched shutoff)3 VOCP(La.OFF) 2–4 1.65 1.83 2.01 V IBD(O) 6–4 −250 −83 −30 μA OLP Bias Current IFB(OLP) 5–4 −15 −10 −5 μA OLP Threshold Voltage VFB(OLP) 5–4 5.50 5.96 6.40 V OVP Threshold Voltage VCC(OVP) 3–4 28.5 31.5 34.0 V FB Pin Maximum Voltage in Feedback Operation VFB(MAX) 5–4 3.70 4.05 4.40 V TJ(TSD) – 135 – – °C Startup Current Supply Threshold Voltage1 VCC = 13 V Normal Operation Stand-by Operation Standby Operation Threshold Voltage Protected Operation BD Pin Source Current Thermal Shut Down Temperature Note: The polarity value for current specifies a sink as "+ ," and a source as “−,” referencing the IC. 1The relation of V CC(BIAS) > VCC(OFF) is maintained. 2The relation of V BD(TH1) > VBD(TH2) is maintained in each product. 2The latch circuit means a circuit operated OVP, OLP, OCP (latch-off), or TSD. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Electrical Characteristics of MOSFET Unless specifically noted, TA = 25°C and VCC = 20 V Pins Min. Typ. Max. Voltage Between Drain and Source Characteristic VDSS 1–2 500 – – V Drain Leakage Current IDSS 1–2 – – 300 μA On-Resistance RDS(on) 1–2 – – 0.8 Ω Switching Time tf 1–2 – – 300 ns – – 2.4 2.7 °C/W Thermal Resistance Symbol Rθch-F Test Conditions Between a channel of the MOSFET and the internal leadframe Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Unit 5 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Characteristic Performance MOSFET Safe Operating Area Curve 100 TA = 25°C Single pulse 100 80 Drain Current, ID (A) Safe Operating Area Temperature Derating Coefficient (%) S. O. A. Temperature Derating Coefficient Curve 60 115 40 20 0 0 25 50 75 100 125 0.1 ms 10 Drain current limited by on-resistance 1 ms 1 150 To use this graph, apply the S.O.A temperature derating coefficient taken from the graph at the left Channel Temperature, Tch (°C) 0.1 10 100 1000 Drain-to-Source Voltage, VDS (V) MOSFET Temperature versus Power Dissipation Curve Allowable Power Dissipation, PD1 (W) 100 80 60 40 20 0 25 50 75 100 125 150 30 25 21.5 20 With infinite heatsink 15 10 5 115 10 Without heatsink 1.8 0 0 25 Channel Temperature, Tch (°C) Transient Thermal Resistance, Rθch-c (°C/W) EAS Temperature Derating Coefficient (%) MOSFET Avalanche Energy Derating Coefficient Curve 50 75 100 125 150 Ambient Temperature, TA (°C) Transient Thermal Resistance Curve 1 0.1 0.01 0.001 10-6 10-5 10-4 10-3 10-2 10-1 Time (s) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Package Outline Drawing 2.6 ±0.2 15 ±0.3 （5.6） Gate burr Ø3.2 ±0.2 4.2 ±0.2 2.8 +0.2 10 ±0.2 STR （1.1） a 2.6 ±0.1 （At base of pin） 10.4 ±0.5 7-0.62 ±0.15 +0.2 7-0.55 -0.1 R-end R-end +0.2 0.45 -0.1 5×P1.17±0.15 ＝5.85±0.15 2 ±0.15 5±0.5 5±0.5 b （At base of pin） 5.08±0.6 2.54±0.6 （At tip of pin） （At tip of pin） 2 1 4 3 6 5 7 0.5 0.5 0.5 Front view Unit: mm Package: TO-220F (Sanken leadform #3051) Leadframe material: Cu Pin treatment: Solder dip Weight: Approximately 1.45 g "Gate Burr" shows area where 0.3 mm (max) gate burr may be present 0.5 Side view a: Part # Y6735 b: Lot number st 1 letter: Last digit of year nd 2 letter: Month Jan to September: Numeric October: O November: N December: D rd th 3 and 4 letter: Date 01 to 31: Numeric th 5 letter: Internal use control number Pin treatment Pb-free. Device composition compliant with the RoHS directive. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Packing Specifications 5 40 ± 2 14. 5 4.5 17.3 ( 15.9 ) 34.5 11 15. 6± 0.3 6 4.8 ± 0.3 2. 1 Tube dimensions (mm) 50 pieces per tube 62 0 125 1.5 ± 0.3 ANTISTATIC 185 Carton dimensions (mm) 36 tubes per carton (maximum) 1800 pieces maximum per carton Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator Because reliability can be affected adversely by improper storage environments and handling methods, please observe the following cautions. Cautions for Storage • Ensure that storage conditions comply with the standard temperature (5°C to 35°C) and the standard relative humidity (around 40% to 75%); avoid storage locations that experience extreme changes in temperature or humidity. • Avoid locations where dust or harmful gases are present and avoid direct sunlight. • Reinspect for rust on leads and solderability of products that have been stored for a long time. Cautions for Testing and Handling When tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing device, shorts between the product pins, and wrong connections. Remarks About Using Silicone Grease with a Heatsink • When silicone grease is used in mounting this product on a heatsink, it shall be applied evenly and thinly. If more silicone grease than required is applied, it may produce excess stress. • Volatile-type silicone greases may crack after long periods of time, resulting in reduced heat radiation effect. Silicone grease with low consistency (hard grease) may cause cracks in the mold resin when screwing the product to a heatsink. • Our recommended silicone greases for heat radiation purposes, which will not cause any adverse effect on the product life, are indicated below: Type Suppliers G746 Shin-Etsu Chemical Co., Ltd. YG6260 MOMENTIVE Performance Materials, Inc. SC102 Dow Corning Toray Co., Ltd. Heatsink Assembly • Attachment torque should be in the range 0.588 to 0.785 N•m (6 to 8 kgf•cm). Soldering • The leadframe temperature should never exceed TF = 105°C(max). • When soldering the products, please be sure to minimize the working time, within the following limits: 260±5°C 10 s 350±5°C 3 s (solder iron) • Soldering iron should be at a distance of at least 2.0 mm from the body of the products. Electrostatic Discharge • When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1 MΩ of resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator. • Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. • When using measuring equipment such as a curve tracer, the equipment should be grounded. • When soldering the products, the head of soldering irons or the solder bath must be grounded in other to prevent leak voltages generated by them from being applied to the products. • The products should always be stored and transported in Sanken shipping containers or conductive containers, or be wrapped in aluminum foil. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9 STR-Y6735-DS STR-Y6735 Off-Line Quasi-Resonant Switching Regulator The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. 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. 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. 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. The contents in this document must not be transcribed or copied without Sanken’s or Allegro's written consent. Copyright © 2010 Allegro MicroSystems, Inc. This datasheet is based on Sanken datasheet SSE-23014 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 10 STR-Y6735-DS