STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators Features and Benefits Description Overcurrent protection (OCP) with ac input voltage compensation function; no additional peripheral circuits required--minimizes dependency of OCP on ac input Overload protection (OLP) with integrated timer reduces power stress (temperature rise) at overload condition, requires no peripheral components Avalanche-guaranteed MOSFET improves device capability of withstanding excess surge voltage, providing a simple surge absorber circuit without breakdown voltage derating Start-up circuit eliminates the need for a start-up resistor, and helps to reduce input power consumption The STR-W6200D series are current-mode PWM ICs that incorporate controller chips. These devices are manufactured using a proprietary high-voltage BCD process, and avalancheguaranteed MOSFETs. These elements allow power supply systems designs that are highly reliable and simple, with fewer peripheral components. These ICs also provide Auto-Burst mode operation, which lowers input power requirements at light loads, and improves efficiency over the entire load range and universal-input range. Applicatons include: Continued on the next page... Package: TO-220 TV set top box LCD PC monitor, LCD TV Printer, scanner General consumer, PC, and industrial applications requiring SMPS power supply with standby mode Not to scale Functional Block Diagram STARTUP VCC D/ST 7.1 V UVLO REG VREG 28.5 V OVP RST R SQ 15.5 V/ 8.9 V 7.1 V ELP TSD =1.6 mA RQ DMAX 75% PWM OSC I startup S DRV SQ R S2 Frequency Modulation FM/ELP Q OLP CK S1 tOLP = tFM x32 R 12 V OCP Drain Peak Current Compensation 7.8 V 160 A Feedback Control FB Slope Compensation 28103.51 LEB S/OCP GND 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D Features and Benefits (continued) Bias Assist function improves start-up performance by selfbiasing the VCC pin, and allows a use of a small value VCC capacitor, resulting in improved response to overvoltage conditions Very low current consumption in nonoperating (UVLO) state: ICC(off) = 5 A (typical) at VCC = 13.8 V Slope compensation circuit stabilizes operation, preventing interference from subharmonics Leading Edge Blanking Various protections: * Overcurrent Protection (OCP), pulse-by-pulse sensing * Overload Protection (OLP), auto restart after certain duration * External Latch Protection (ELP), latched * Overvoltage Protection (OVP), latched * Thermal Shut Down (TSD), latched Externally-activated shut down protection (ELP) for emergency system shut down Auto-Burst Standby function (pin < 0.1 W at zero output load condition) Audible noise reducing function in Standby mode TO-220 full-molded package with 6 pins Selection Guide Part Number Packing STRW6251D 50 pieces per tube Pin-out Diagram Terminal List Table Number Name 1 D/ST 2 NC 3 S/OCP 4 Description Functions Drain/startup terminal MOSFET drain and input of start-up signal Clipped No connection Source/Overcurrent Protection terminal MOSFET source and input of overcurrent detection signal VCC Power supply terminal Input of power supply for control circuit 5 GND Ground terminal Ground 6 FB Feedback terminal Input of constant voltage control signal 7 FM/ELP Frequency jittering and External Latch Protection terminal Control input for frequency jittering control and External Latch Protection 1 2 3 4 5 6 7 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 25C, unless otherwise stated. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D ABSOLUTE MAXIMUM RATINGS at TA = 25C Symbol Terminal Rating Unit Drain Current1 Characteristic IDpeak 1-3 Single Pulse Note 2.6 A Maximum Switching Current2 IDMAX 1-3 TA = -20 to 125C 2.6 A mJ EAS 1-3 Single Pulse 47 IDpeak 1-3 VDD = 99 V, L = 20 mH 2 A S/OCP Terminal Voltage VOCP 3-5 -6 to 6 V FM/ELP Terminal Voltage VFM 7-5 -0.3 to 14 V FM/ELP Terminal Inflow Current IFM 7-5 3 mA FB Terminal Voltage VFB 6-5 -0.3 to 9 V Controller (MIC) Input Voltage VCC 4-5 0 to 32 V MOSFET Power Dissipation4 PD1 8-1 With infinite heatsink 25 W Without heatsink 1.3 W Controller (MIC) Power Dissipation PD2 5-3 For VccxIcc 0.8 W Operating Internal Frame Temperature TF - Refer to TOP -20 to 115 C Operating Ambient Temperature Top - -20 to 115 C Storage Temperature Tstg - -40 to 125 C Channel Junction Temperature TJ - 150 C Single Pulse Avalanche Energy3 1Refer to figure 1 2I DMAX is the drain current on the D/ST pin determined by the drive voltage of the IC and the threshold voltage, Vth, of the MOSFET 3Refer to figure 3 4Refer to figure 4 Figure 1 - MOSFET Safe Operating Area Derating Curve Figure 2 - MOSFET Safe Operating Area Drain Current versus Voltage at TA = 25C, Single Pulse 100.00 80 Drain Current, ID (A) 10.00 60 40 0. 1 1.00 it m s s 1m Safe Operating Area Temperature Derating Coefficient (%) 100 lim n) nt S(o rre to R D u C e du 0.10 20 Refer to figure 1 for MOSFET SOA temperature derating coefficient 0.01 0 0 25 50 75 100 Temperature, TF (C) 125 150 1 10 100 1000 Drain-to-Source Voltage, VDS (V) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 3 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D Figure 3 - MOSFET Avalanche Energy Derating Curve Figure 4 - Transient Thermal Resistance 10.00 Transient Thermal Resistance, RQJC (C/W) 80 60 40 20 1.00 0.10 0.01 0 25 50 75 100 125 150 1 10 100 1m 10m 100m Time, t (s) Channel Junction Temperature, TJ (C) Figure 5 - MOSFET Power Dissipation versus Temperature 30 25 Power Dissipation, PD1 (W) EAS Temperature Derating Coefficient (%) 100 20 With infinite heatsink PD1 = 25 W at TA 25C 15 10 5 Without heatsink PD1 = 1.3 W at TA 25C 0 0 20 40 60 80 100 120 140 160 Ambient Temperature, TA (C) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 4 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D ELECTRICAL CHARACTERISTICS valid at VCC = 18 V, TA = 25C, unless otherwise specified Characteristic Symbol Terminal Test Conditions Min. Typ. Max Units Power Supply Start-up Operation Operation Start Voltage VCC(ON) 4-5 (VCC voltage at which operation starts) Measurement circuit 1, VCC = 0 through 13.9 through 17.1 V 13.9 15.5 17.1 V Operation Stop Voltage VCC(OFF) 4-5 (VCC voltage at which operation stops) Measurement circuit 1, VCC = 17.1 through 9.8 to 8.0 V 8.0 8.9 9.8 V ICC(ON) 4-5 (Inflow current into VCC terminal in oscillation) Measurement circuit 1 - 1.4 2.8 mA Circuit Current in Non-Oscillation ICC(STOP) 4-5 (Inflow current into VCC terminal at VFB = 0 V) Measurement circuit 1 - 0.8 1.3 mA Circuit Current in Non-Operation ICC(OFF) 4-5 (Inflow current into VCC terminal prior to oscillation) Measurement circuit 1, VCC = 13.8 - 5 20 A Start-up Current Istartup 4-5 (Inflow current into D/ST terminal) Measurement circuit 7, VCC = 0, D/ST = 450 V -0.9 -1.6 -2.3 mA Bias Assist Voltage VBIAS 4-5 (VCC voltage at which Istartup starts, and IstartupBias begins) Measurement circuit 7, VCC = 17.1 through 13.6 to 16.8 V 13.6 15.2 16.8 V FM/ELP High Threshold Voltage VFM(H) 7-5 (FM/ELP terminal voltage at which IFM changes from -13 A to 13 A) Measurement circuit 2 4.0 4.5 5.0 V FM/ELP Low Threshold Voltage VFM(L) 7-5 (FM/ELP terminal voltage at which IFM changes from 13 A to -13 A) Measurement circuit 2 2.4 2.8 3.2 V FM/ELP Voltage Hysteresis VFMhys 7-5 (VFM(H) - VFM(L)) Measurement circuit 2 1.3 1.7 1.9 V -17.4 -13 -8.6 A Circuit Current in Operation Normal Operating Characteristics FM/ELP Outflow Current1 IFMsrc 7-5 (FM/ELP terminal outflow current at VFM = VFM(L)) Measurement circuit 2 FM/ELP Inflow Current1 IFMsink 7-5 (FM/ELP terminal inflow current at VFM = VFM(H)) Measurement circuit 2 8.6 13 17.4 A Average Switching Frequency fOSC(av) 1-5 (D/ST terminal average oscillation frequency) Measurement circuit 2 60 67 74 kHz f 1-5 fOSC (peak-to-peak) Measurement circuit 2 4.8 6.9 9 kHz DMAX 1-5 (Maximum width of the low portion of the D/ST terminal waveform) Measurement circuit 2 71 75 79 % FB Maximum Feedback Current1 IFB(MAX) 6-5 (FB terminal outflow current at VFB = 0 V) Measurement circuit 3 -220 -160 -100 A Burst Threshold Voltage Vburst(th) 6-5 Set VFM = 0 V and decrease VFB (Vburst(th) is the FB terminal voltage level at which D/ST changes from low to high) Measurement circuit 3 0.99 1.10 1.21 V Slope Compensation Start-up Duty Cycle DSLP 6-5 DSLP = (t3 / t4) x 100 (see figure for measurement circuit 4 for values of t) Measurement circuit 4 - 27 - % Slope Compensation Rate SLP 6-5 SLP = 0.02 / (t2 - t1) (see figure for measurement circuit 4 for values of t) Measurement circuit 4 -22 -17 -12 mV/s Frequency Jitter Deviation Maximum Duty Cycle Continued on next page... Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 5 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D ELECTRICAL CHARACTERISTICS, continued, valid at VCC = 18 V, TA = 25C, unless otherwise specified Characteristic Symbol Terminal Test Conditions Min. Typ. Max Units Set VFM = 0 V and increase VOCP. (VOCP1 is the S/OCP terminal voltage level at which D/ST changes from low to high) Measurement circuit 5 0.71 0.78 0.86 V Protection Operation OCP Threshold Voltage at Zero Duty Cycle (0% On-Duty) VOCP1 3-5 DPC - DPC = -0.75x SLP / fOSC(av) 1.5 1.9 2.3 mV/ DC% OCP Threshold Voltage After Compensation VOCP2 3-5 VOCP2 = DPC x DMAX + VOCP1 0.82 0.93 1.04 V Leading Edge Blanking Time tblank 1-5 (The low portion of the D/ST terminal waveform at VOCP = 2 V) Measurement circuit 5 280 400 520 ns OLP Delay Time tOLP 1-5 (Time between setting FB terminal open and when oscillation stops) Measurement circuit 6 - 200 - ms Circuit Current in OLP-Operation ICC (OLP) 4-5 (Inflow current into VCC terminal after OLP operation) Measurement circuit 6 - 410 700 A OVP Protection Voltage VCC(OVP) 4-5 (VCC terminal voltage at which the voltage of D/ST terminal is switched from low to high by decreasing VFB after setting VFM = 0 V) Measurement circuit 1, VCC = 18.0 V through 27 to 30 V 27 28.5 30 V Latch Circuit Sustaining Current2 ICC(La.H) 4-5 (Inflow current into VCC terminal after OVP operation) Measurement circuit 1, VCC = 8 V - 140 220 A VCC(La.OFF) 4-5 (VCC voltage at which ICC is dropped below 20 A by decreasing VCC after OVP operation) VCC = 31.0 V through 7.8 to 6.4 V 6.4 7.1 7.8 V ELP Threshold Voltage VELP 7-5 (FM/ELP terminal voltage at which the oscillation of the D/ST terminal waveform is stopped by increasing VFM) Measurement circuit 2 6.4 7.1 7.8 V Inflow Current at External Latch Protection IELP 7-5 (Inflow current at VFM = VELP) Measurement circuit 2 - 55 100 A Thermal Shut Down Operating Temperature TJTSD - 135 - - C Drain-to-Source Breakdown Voltage VDSS 1-3 ID = 300 A, Measurement circuit 8 650 - - V Drain Leakage Current IDSS 1-3 VD = 650 V, Measurement circuit 7 - - 300 A ON-Resistance RDS(ON) 1-3 ID = 0.6 A, VFM = 0 V Measurement circuit 10 - - 3.95 Switching Time tr 1-3 Measurement circuit 9 - - 400 ns Thermal Resistance RJ-F - Measured between junction and internal frame - - 2.23 C/W Single Pulse Avalanche Energy EAS - Measurement circuit 11 - - - - Drain Peak Current Compensation Coefficient Latch Circuit Release Voltage2 Power MOSFET Characteristics 1Input 2The and output current polarity at the device pin; plus(+) represents sink and minus(-) represents source. latch circuit means a circuit operated ELP, OVP, and TSD. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 6 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D Measurement Circuit 1 V CC(ON) 13.8V STR-W6200D D/ST 1 S/OCP VCC GND 3 4 5 FB 6 FM/ ELP V CC 7 V FM 0V V FB 0V 5V A ICC V DD 10V + 1F V FB V CC 8V V CC(OFF) 3.65V V CCc(La.OFF) V OFF(FM) 0V 2V VD 100 32V V CC(OVP) 18V VD V FM ICC ICC(OFF) ICC(STOP) ICC(La.H) ICC(ON) Measurement Circuit 2 18V V CC 5V V FB STR-W6200D D/ST 1 S/OCP VCC GND 3 4 5 FB 6 FM/ ELP VD A + 100 18V V DD 10V 0V 0V V FM V FML V FB V FM 2.8Vtyp V LFM +(V FMH -V FML)/2 IELP Isrc(FM) IFM 0A f =f osc(Hi)-f osc(Lo) Dmax= t2/ t1100 Isnk(FM) 1F V CC V ELP 4.5Vtyp V FMH 7 IFM 5V t2 VD f osc(Hi) f osc(av) t1 f osc(Lo) Measurement Circuit 3 18V V CC 5V 5V V FM 5V STR-W6200D D/ST 1 S/OCP VCC GND 3 4 5 FB 6 FM/ ELP V FB 7 V HYS Vburst 5V 0V IFB VD + 100 18V V DD 10V 0V V CC VD A 1F V FM V FB -IFB IFB(MAX) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com IFB(MIN) 7 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D Measurement Circuit 4 18V V CC 5V 3.65V V FM STR-W6200D D/ST 1 VD 100 S/OCP VCC GND 3 4 5 FB 6 V FB + V DD 10V V FB 7 V OCP 18V FM/ ELP 1F V FM 4V V1 Internal feedback signal 0.68V V1-0.02V V1-0.04V V OCP t4 4V V CC VD DSLP= t3 / t4 100 SLP = 0.02 / (t2-t1) t1 t2 t3 t5(tblank) Measurement Circuit 5 18V V CC 5V V FM STR-W6200D D/ST 1 VD 100 S/OCP VCC GND 3 4 5 FB 6 FM/ ELP 7 3.65V 0V 2V V OCP1 V OCP 0V V OCP tblank + 18V V DD 20V 1F V FM V CC VD V D(Lo) VOCP2 = (-0.75 x SLP x DMAX / fOSC(av)) + VOCP1 Measurement Circuit 6 18 V V CC STR-W6200D D/ST 1 S/OCP VCC GND 3 VD 100 4 5 ICC A 6 FM/ ELP + SW V FM 7 t FM SW ONOFF V FB 1F V DD 10V FB 7.8 V typ V FB V FM 47nF VD V CC 18V ICC(OLP) ICC t OLP(= t FM16) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 8 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D Measurement Circuit 7 650V 400V V DD 18V STR-W6200D D/ST 1 S/OCP VCC GND 3 ID 4 ICC A 5 FB 6 V CC FM/ ELP 13V 0V V FM 7 V BIAS 5V 0V A ID + V DD V CC IDSS V FM ICC 1F ISTARTUP Measurement Circuit 8 STR-W6200D D/ST 1 S/OCP VCC GND 3 4 5 FB 6 FM/ ELP 7 Measurement Circuit 9 STR-W6200D D/ST S/OCP 1 VD 3 VCC GND 4 5 FB 6 FM/ ELP VD 10V 7 90% VD ID V + 300 A 18V V FM 1F 47nF V CC 100 + 18V V DD 10V 10% V FM 1F 47nF V CC tr Measurement Circuit 10 18V V CC STR-W6200D D/ST 1 S/OCP VCC GND 3 4 5 FB 6 FM/ ELP 7 VD V ID 0.6A 5V V FM 0V + 18V V CC 1F V FM VD V D(Lo) RDS(ON) =V D(Lo) / 0.6 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 9 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D Measurement Circuit 11 Vcc STR-W6200D D/ST S/OCP L 1 3 VCC GND 4 V DD 5 FB 6 FM/ ELP 18V 8V V GS 7 V DSpeak + V DS 18V V GS IL 1F V DD V DS V CC t TYPICAL APPLICATION CIRCUIT O UT V IN ( ac) 1 4 D/ST VCC S T R -W 6200D FM / S/O C P ELP 3 7 GND 5 FB 6 G ND Option Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 10 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D PACKAGE DIMENSIONS, TO-220 O3.2 0.2 2.6 0.1 Terminal dimension at case surface 5.0 0.5 +0.2 (5.4) 1.74 -0.1 1) xR (2 +0.2 1.34 -0.1 10.4 0.5 XXXXXXXX XXXXXXXX 2.8 MAX Branding 16.9 0.3 2.8 0.2 7.9 0.2 Gate Burr 4.2 0.2 4 0.2 10.0 0.2 +0.2 6xP1.27 0.15 = 7.62 0.15 Terminal dimensions at case surface 0.45 -0.1 5.08 0.6 Terminal dimension at lead tips 1 2 3 4 5 6 7 Gate burr: 0.3 mm (max.) Terminal core material: Cu Terminal treatment: Ni plating and solder dip Heat sink material: Cu Heat sink treatment: Ni plating Leadform: 2003 Weight (approximate): 2.3 g Drawing for reference only Branding codes (exact appearance at manufacturer discretion): 1st line, type: W6251 2nd line, lot: YMDD R Where: Y is the last digit of the year of manufacture M is the month (1 to 9, O, N, D) DD is the 2-digit date R is the manufacturer registration symbol Dimensions in millimeters Leadframe plating Pb-free. Device composition complies with the RoHS directive. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 11 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators STR-W6251D PACKING SPECIFICATIONS Minimum packing option: Tube FM-205 E 4.8 +0.4 0 1.4 5.1 9 x R0.6 35.0 (15.4) 9.5-0.1 +0.3 8.9 Shipping Tube Dimensions: Wall thickness: 0.60.3 mm Wall warp: <2 mm Material: Hardened polyvinyl Coating: antistatic Tolerance 0.4 mm, unless otherwise specified Side marked "ANTISTATIC" 2.85 +0.3 (3.6) 1.3 -0.2 14.3 Spacer Carton (side view) Tube Shipping Carton Dimensions: Capacity: 1800 pieces maximum per carton 36 tubes per carton 3 rows, 12 tubes per row Spacer 620 125 Tube All dimensions: mm 185 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 12 STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators 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. 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 (5C to 35C) 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 in 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 adjacent products, and shorts to the heatsink. 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 stress. * Volatile-type silicone greases may produce cracks 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 GE Toshiba Silicone Co., Ltd. SC102 Dow Corning Toray Silicone Co., Ltd. Soldering * When soldering the products, please be sure to minimize the working time, within the following limits: 2605C 10 s 3505C 3 s * Soldering iron should be at a distance of at least 1.5 mm from the body of the products Electrostatic Discharge * When handling the products, operator must be grounded. Grounded wrist straps worn should have at least 1 M of resistance to ground to prevent shock hazard. * 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 our shipping containers or conductive containers, or be wrapped in aluminum foil. Assembly * During soldering or other operations, the interior frame temperature of the device should never exceed 105C. * Recommended screw torque through the mounting tab is 0,588 to 0.785 N * m (6 to 8 kgf * cm) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 13 STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators 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. Copyright (c) 2006-2007 Allegro MicroSystems, Inc. This datasheet is based on Sanken datasheet SSE23661 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 14 STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators Worldwide Contacts Asia-Pacific China Sanken Electric Hong Kong Co., Ltd. Suite 1026, Ocean Centre Canton Road, Tsimshatsui Kowloon, Hong Kong Tel: 852-2735-5262, Fax: 852-2735-5494 Sanken Electric (Shanghai) Co., Ltd. Room 3202, Maxdo Centre Xingyi Road 8, Changning District Shanghai, China Tel: 86-21-5208-1177, Fax: 86-21-5208-1757 Taiwan Sanken Electric Co., Ltd. Room 1801, 18th Floor 88 Jung Shiau East Road, Sec. 2 Taipei 100, Taiwan R.O.C. Tel: 886-2-2356-8161, Fax: 886-2-2356-8261 Japan Sanken Electric Co., Ltd. Overseas Sales Headquarters Metropolitan Plaza Building 1-11-1 Nishi-Ikebukuro, Toshima-ku Tokyo 171-0021, Japan Tel: 81-3-3986-6164, Fax: 81-3-3986-8637 Singapore Sanken Electric Singapore Pte. Ltd. 150 Beach Road, #14-03 The Gateway West Singapore 189720 Tel: 65-6291-4755, Fax: 65-6297-1744 Europe Sanken Power Systems (UK) Limited Pencoed Technology Park Pencoed, Bridgend CF35 5HY, United Kingdom Tel: 44-1656-869-100, Fax: 44-1656-869-162 North America United States Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01606, U.S.A. Tel: 1-508-853-5000, Fax: 1-508-853-7895 Allegro MicroSystems, Inc. 14 Hughes Street, Suite B105 Irvine, California 92618, U.S.A. Tel: 1-949-460-2003, Fax: 1-949-460-7837 Korea Sanken Electric Korea Co., Ltd. Samsung Life Yeouido Building 16F 23-10, Yeouido-Dong, Yeongdeungpo-gu Seoul 150-734, Korea Tel: 82-2-714-3700, Fax: 82-2-3272-2145 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 15