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Description
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 avalanche- guaranteed 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: ▪ TV set top box ▪ LCD PC monitor, LCD TV ▪ Printer, scanner ▪ General consumer, PC, and industrial applications requiring SMPS power supply with standby mode Features and Benefits ▪ 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
30 W-Universal Input/45 W-230 Vac Input
Package: TO-220 Not to scale Continued on the next page… 28103.51 DRV D/STVCC LEB S/OCP TSD PWM OSC REG FB 15.5 V/ 8.9 V DMA X75% 28.5 V 7.8 V GND FM/ELP 160 μA R SQ SQ R 7.1 V Slope Compensation Drain Peak Current Compensation VR E G STARTUP Istartup =1.6 mA S2 Q CK R OLP tOLP= tFM×32 Frequency Modulation RQ S UVLO ELP RST 7.1 V OVP Feedback Control OCP12 V
PWM Switching RegulatorsSTR-W6251D 2Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ▪ Bias Assist function improves start-up performance by self- biasing 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: I CC(off) = 5 μA (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 Features and Benefits (continued) Selection Guide Part Number Packing STRW6251D 50 pieces per tube Pin-out Diagram 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, T A, of 25°C, unless oth er wise stated. 1234567 Terminal List Table Number Name Description Functions
1 D/ST Drain/startup terminal MOSFET drain and input of start-up signal
2 NC Clipped No connection
3 S/OCP Source/Overcurrent Protection
MOSFET source and input of overcurrent detection signal
4 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
Control input for frequency jittering control and External Latch Protection
PWM Switching RegulatorsSTR-W6251D 3Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ABSOLUTE MAXIMUM RATINGS at TA = 25°C Characteristic Symbol Terminal Note Rating Unit Drain Current1 IDpeak 1-3 Single Pulse 2.6 A Maximum Switching Current2 IDMAX 1-3 T A = –20 to 125°C 2.6 A Single Pulse Avalanche Energy3 EAS 1-3 Single Pulse 47 mJ IDpeak 1-3 V DD = 99 V, L = 20 mH 2 A S/OCP Terminal Voltage V OCP 3-5 –6 to 6 V FM/ELP Terminal Voltage V FM 7-5 –0.3 to 14 V FM/ELP Terminal Inflow Current I FM 7-5 3 mA FB Terminal Voltage V FB 6-5 –0.3 to 9 V Controller (MIC) Input Voltage V CC 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 P D2 5-3 For Vcc×Icc 0.8 W Operating Internal Frame Temperature T F – Refer to T OP –20 to 115 °C Operating Ambient Temperature T op – –20 to 115 °C Storage Temperature T stg – –40 to 125 °C Channel Junction Temperature T J – 150 °C 1Refer to figure 1 2IDMAX 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 Temperature, TF (°C) Safe Operating Area Temperature Derating Coefficient (%) 100 0 2 55 07 5 1 0 0 1 2 5 1 5 0 Drain-to-Source Voltage, VDS (V) Drain Current, ID (A) 10.00 0.10 1.00 0.01 100.00 10 100 10001 1 ms 0.1 ms Current limit due to R DS(on) Refer to figure 1 for MOSFET SOA temperature derating coefficient Figure 1 – MOSFET Safe Operating Area Derating Curve Figure 2 – MOSFET Safe Operating Area Drain Current versus Voltage at TA = 25°C, Single Pulse
PWM Switching RegulatorsSTR-W6251D 4Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Channel Junction Temperature, TJ (°C) EAS Temperature Derating Coefficient (%) 100 25 50 75 100 125 150 Time, t (s) Transient Thermal Resistance, RQJC (°C/W) 1.00 0.10 0.01 10.00 100μ10μ 10m1m 100m1μ Ambient Temperature, TA (°C) Power Dissipation, PD1 (W) 0 20 40 60 80 100 120 140 160 PD1 = 1.3 W at TA ≤ 25°C Without heatsink With infinite heatsink PD1 = 25 W at TA ≤ 25°C Figure 3 – MOSFET Avalanche Energy Derating Curve Figure 4 – Transient Thermal Resistance Figure 5 – MOSFET Power Dissipation versus Temperature
PWM Switching RegulatorsSTR-W6251D 5Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ELECTRICAL CHARACTERISTICS valid at VCC = 18 V, TA = 25°C, unless otherwise specified Characteristic Symbol Terminal Test Conditions Min. Typ. Max Units Power Supply Start-up Operation Operation Start Voltage V CC(ON) 4-5 (VCC voltage at which operation starts) Measurement Operation Stop Voltage V CC(OFF) 4-5 (VCC voltage at which operation stops) Measurement Circuit Current in Operation I CC(ON) 4-5 (Inflow current into VCC terminal in oscillation) Measurement circuit 1 – 1.4 2.8 mA Circuit Current in Non-Oscillation I CC(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 I CC(OFF) 4-5 (Inflow current into VCC terminal prior to oscillation) Measurement circuit 1, VCC = 13.8 –5 2 0 μA Start-up Current I startup 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 V BIAS 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 Normal Operating Characteristics FM/ELP High Threshold Voltage V FM(H) 7-5 (FM/ELP terminal voltage at which IFM changes from –13 μA to 13 μA) Measurement circuit 2 4.0 4.5 5.0 V FM/ELP Low Threshold Voltage V FM(L) 7-5 (FM/ELP terminal voltage at which IFM changes from 13 μA to –13 μA) Measurement circuit 2 2.4 2.8 3.2 V FM/ELP Voltage Hysteresis V FMhys 7-5 (V FM(H) – VFM(L)) Measurement circuit 2 1.3 1.7 1.9 V FM/ELP Outflow Current1 IFMsrc 7-5 (FM/ELP terminal outflow current at VFM = VFM(L)) Measurement circuit 2 –17.4 –13 –8.6 μA FM/ELP Inflow Current1 IFMsink 7-5 (FM/ELP terminal inflow current at VFM = VFM(H)) Measurement circuit 2 8.6 13 17.4 μA Average Switching Frequency f OSC(av) 1-5 (D/ST terminal average oscillation frequency) Measurement circuit 2 60 67 74 kHz Frequency Jitter Deviation ∆f 1-5 f OSC (peak-to-peak) Measurement circuit 2 4.8 6.9 9 kHz Maximum Duty Cycle D MAX 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 μA Burst Threshold Voltage V burst(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 D SLP 6-5 DSLP = (t3 / t4) × 100 (see figure for measurement circuit 4 for values of t) Measurement circuit 4 –2 7– % 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/ μs Continued on next page…
PWM Switching RegulatorsSTR-W6251D 6Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Protection Operation OCP Threshold Voltage at Zero Duty Cycle (0% On-Duty) VOCP1 3-5 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 Drain Peak Current Compensation Coefficient D PC –D PC = –0.75× SLP / fOSC(av) 1.5 1.9 2.3 mV/ DC% OCP Threshold Voltage After Compensation VOCP2 3-5 V OCP2 = DPC × DMAX + VOCP1 0.82 0.93 1.04 V Leading Edge Blanking Time t blank 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 t OLP 1-5 (Time between setting FB terminal open and when oscillation stops) Measurement circuit 6 – 200 – ms Circuit Current in OLP-Operation I CC (OLP) 4-5 (Inflow current into VCC terminal after OLP operation) Measurement circuit 6 – 410 700 μA OVP Protection Voltage V CC(OVP) 4-5 (VCC terminal voltage at which the voltage of D/ST terminal is switched from low to high by decreasing V FB 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 μA Latch Circuit Release Voltage2 VCC(La.OFF) 4-5 (VCC voltage at which ICC is dropped below 20 μA 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 V ELP 7-5 (FM/ELP terminal voltage at which the oscillation of the D/ST terminal waveform is stopped by increasing V FM) Measurement circuit 2 6.4 7.1 7.8 V Inflow Current at External Latch Protection IELP 7-5 (Inflow current at V FM = VELP) Measurement circuit 2 – 55 100 μA Thermal Shut Down Operating Temperature TJTSD – 135 – – °C Power MOSFET Characteristics Drain-to-Source Breakdown Voltage V DSS 1-3 I D = 300 μA, Measurement circuit 8 650 – – V Drain Leakage Current I DSS 1-3 V D = 650 V, Measurement circuit 7 – – 300 μA ON-Resistance R DS(ON) 1-3 I D = 0.6 A, VFM = 0 V Measurement circuit 10 – – 3.95 Ω Switching Time t r 1-3 Measurement circuit 9 – – 400 ns Thermal Resistance R θJ-F – Measured between junction and internal frame – – 2.23 °C/W Single Pulse Avalanche Energy E AS – Measurement circuit 11 – – – – 1Input and output current polarity at the device pin; plus(+) represents sink and minus(–) represents source. 2The latch circuit means a circuit operated ELP, OVP, and TSD. ELECTRICAL CHARACTERISTICS, continued, valid at VCC = 18 V, TA = 25°C, unless otherwise specified Characteristic Symbol Terminal Test Conditions Min. Typ. Max Units
PWM Switching RegulatorsSTR-W6251D 7Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 13.8V VCC(ON) VCC(OFF) 18V ICC(OFF) VCC VD ICC VCCc(La.OFF)8V ICC(La.H)ICC(STOP) 32V VD VFM VFML VFMH VLFM+(VFMH-VFML)/2 IFM fosc(av) Isnk(FM) fosc(Hi) fosc(Lo) Δf =f osc(Hi)-f osc(Lo) Dmax= t2/ t1 х100 Isrc(FM) 0μA 4.5Vtyp 2.8Vtyp VELP 1μF VCC 100Ω A ICC VDD 10V VD 100Ω VDD 10V VD A IFM VFM 18V D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 100Ω VDD 10V VD A IFB VFB VFM D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 ICC(ON) VFB VFB VFM VFM VCC(OVP) 3.65V 1μF VCC 18V 1μF VCC VCC 18V VFB 0V VFB VFM Vburst VFB VD IFB(MAX) -IFB VHYS VCC 18V VOFF(FM) IELP IFB(MIN) Measurement Circuit 1 Measurement Circuit 2 Measurement Circuit 3
PWM Switching RegulatorsSTR-W6251D 8Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Measurement Circuit 4 Measurement Circuit 6 Measurement Circuit 5 VD VOCP VOCP1 VD(Lo) tblank VFM VD ICC 100Ω VDD 10V VD tOLP(= tFM16) ICC(OLP) t FM D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 VFM 3.65V D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 VFB
7.8 V typ
18V 1μF VCC VOCP 100ǡ VDD 20V VD VFM 47nF1μF VCC A ICC 18V VCC 18V VCC 18 V SW ONψOFF SW D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 VFB VFM 18V 1μF VCC VOCP 100Ω VDD 10V VD VFB VD VOCP Internal feedback signal V1-0.04V V1-0.02V t1 t2 0.68V VCC 18V VFM 3.65V t3 t5(≈tblank)DSLP= t3 / t4 100 VOCP2 = (–0.75 × SLP × DMAX / fOSC(av)) + VOCP1
PWM Switching RegulatorsSTR-W6251D 9Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 10V 90% 10% tr VDD A ID ID VD V D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 VD 100Ω VDD 10V VD D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 RDS(ON)=VD(Lo) /0 . 6 1μFVCC + VFM VFM 47nF 18V 1μF VCC + VFM 47nF 18V 1μF VCC VD VD(Lo) D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 VFM VFM 18V 1μF VCC ID VD V 0.6A VCC 18V A ICC 300 μ A VDD VCC ID 650V 13V IDSS VFM 18V VBIAS 400V ISTARTUP ICC Measurement Circuit 7 Measurement Circuit 8 Measurement Circuit 9 Measurement Circuit 10
PWM Switching RegulatorsSTR-W6251D 10Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com TYPICAL APPLICATION CIRCUIT 1 4 3 7 5 6 VCCD/ST FM / ELP STR-W 6200D S/OCP VIIN( ac) GND OUT GND FB Option Measurement Circuit 11 L VDS Vcc 18V VGS 8V VDS IL VDSpeak VDD t VDD VGS D/ST S/OCP VCC GND FB FM/ ELP STR-W6200D 3 4 5 6 74 6 18V 1μF VCC
PWM Switching RegulatorsSTR-W6251D 11Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com PACKAGE DIMENSIONS, TO-220 10.0 ±0.2 4.2 ±0.2 2.8 ±0.2 Ø3.2 ±0.2 2.6 ±0.1 (2×R1) Terminal dimension at case surface 5.08 ±0.6 1.74 +0.2 –0.1 1.34 +0.2 –0.1 0.45 +0.2 –0.1 16.9 ±0.3 10.4 ±0.5 5.0 ±0.5 7.9 ±0.2 4 ±0.22.8 MAX (5.4) Gate Burr Branding XXXXXXXX XXXXXXXX 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 Dimensions in millimeters 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 1234567 Terminal dimensions at case surface Terminal dimension at lead tips Leadframe plating Pb-free. Device composition complies with the RoHS directive.
PWM Switching RegulatorsSTR-W6251D 12Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com PACKING SPECIFICATIONS Minimum packing option: Tube FM-205 E Shipping Tube Dimensions: Wall thickness: 0.6±0.3 mm Wall warp: <2 mm Material: Hardened polyvinyl Coating: antistatic Tolerance ±0.4 mm, unless otherwise specified All dimensions: mm Side marked “ANTISTATIC” (3.6) (15.4) 9 × R0.6 5.1 2.85 14.3 8.9 35.0 1.4 9.5+0.3 –0.1 4.8 +0.4 1.3 +0.3 –0.2 Shipping Carton Dimensions: Capacity: 1800 pieces maximum per carton 36 tubes per carton 3 rows, 12 tubes per row Spacer Carton (side view) Spacer Tube 620 125 185 Tube
PWM Switching RegulatorsSTR-W6251D 13Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 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 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 f rom 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: 260±5°C 10 s 350±5°C 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 Ω 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 voltage s 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 al uminum foil. Assembly
- During soldering or other operations, the interior frame temperature of the device should never exceed 105°C.
- Recommended screw torque through the mounting tab is 0,588 to 0.785 N • m (6 to 8 kgf • cm) 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. Pre cau tions must be taken to prevent accidental contact with power-line potentials. Do not connect ground ed test equipment. The use of an isolation transformer is recommended during circuit development and breadboarding.
PWM Switching RegulatorsSTR-W6251D 14Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com The products described herein are manufactured in Ja pan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken and Allegro reserve the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be re quired to per mit im- prove ments in the per for mance, reliability, or manufacturability of its prod ucts. Therefore, the user is cau tioned to verify that the in for ma tion in this publication is current before placing any order. When using the products described herein, the ap pli ca bil i ty and suit abil i ty 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 prod ucts, the occurrence of failure and defect of semi con duc tor products at a certain rate is in ev i ta ble. 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 equip ment or apparatus (home ap pli anc es, office equipment, tele com mu ni ca tion equipment, measuring equipment, etc.). Their use in any application requiring radiation hardness assurance (e.g., aero space equipment) is not supported. When considering the use of Sanken products in ap pli ca tions where higher reliability is re quired (transportation equipment and its control systems or equip ment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written confirmation of your spec i fi ca tions. The use of Sanken products without the written consent of Sanken in applications where ex treme ly high reliability is required (aerospace equip- ment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited. The information in clud ed herein is believed to be accurate and reliable. Ap pli ca tion and operation examples described in this pub li ca tion are given for reference only and Sanken and Allegro assume no re spon si bil i ty for any in fringe ment of in dus tri al property rights, intellectual property rights, or any other rights of Sanken or Allegro or any third party that may result from its use. Copyright © 2006-2007 Allegro MicroSystems, Inc. This datasheet is based on Sanken datasheet SSE23661
PWM Switching RegulatorsSTR-W6251D 15Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 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 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 Singapore Sanken Electric Singapore Pte. Ltd.
150 Beach Road, #14-03 The Gateway West
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 Worldwide Contacts