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STR-W6251D 30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
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
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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 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: TV set top box LCD PC monitor, LCD TV Printer, scanner General consumer, PC, and industrial applications requiring SMPS power supply with standby mode
Package: TO-220
Not to scale
Functional Block Diagram
VCC
7.1 V
STARTUP UVLO
15.5 V/ 8.9 V 7.1 V
D/ST
REG
VREG
28.5 V
OVP ELP TSD
RST
R SQ
=1.6 mA
I startup
DMAX 75%
RQ S DRV
PWM OSC
SQ R
S2
Q
FM/ELP
Frequency Modulation
12 V 7.8 V
OLP
CK S1 tOLP = tFM x32 R
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OCP
Drain Peak Current Compensation
160 A
FB Slope Compensation
Feedback Control
LEB
S/OCP
GND
28103.51
STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
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
STRW6251D
Packing
50 pieces per tube
Pin-out Diagram
Terminal List Table
Number 1 2 3 4 5 6 7 Name D/ST NC S/OCP VCC GND FB FM/ELP Clipped Source/Overcurrent Protection terminal Power supply terminal Ground terminal Feedback terminal Frequency jittering and External Latch Protection terminal Description Drain/startup terminal No connection MOSFET source and input of overcurrent detection signal Input of power supply for control circuit Ground Input of constant voltage control signal Control input for frequency jittering control and External Latch Protection Functions MOSFET drain and input of start-up signal
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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
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
ABSOLUTE MAXIMUM RATINGS at TA = 25C Characteristic Drain Current1 Maximum Switching Current2 Single Pulse Avalanche Energy3 S/OCP Terminal Voltage FM/ELP Terminal Voltage FM/ELP Terminal Inflow Current FB Terminal Voltage Controller (MIC) Input Voltage MOSFET Power Dissipation4 Controller (MIC) Power Dissipation Operating Internal Frame Temperature Operating Ambient Temperature Storage Temperature Channel Junction Temperature
1Refer
Symbol IDpeak IDMAX EAS IDpeak VOCP VFM IFM VFB VCC PD1 PD2 TF Top Tstg TJ
Terminal 1-3 1-3 1-3 1-3 3-5 7-5 7-5 6-5 4-5 8-1 5-3 - - - - With infinite heatsink Without heatsink For VccxIcc Refer to TOP Single Pulse TA = -20 to 125C Single Pulse
Note
Rating 2.6 2.6 47 2 -6 to 6 -0.3 to 14 3 -0.3 to 9 0 to 32 25 1.3 0.8 -20 to 115 -20 to 115 -40 to 125 150
Unit A A mJ A V V mA V V W W W C C C C
VDD = 99 V, L = 20 mH
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
100
Figure 2 - MOSFET Safe Operating Area
Drain Current versus Voltage at TA = 25C, Single Pulse
100.00
Safe Operating Area Temperature Derating Coefficient (%)
80 Drain Current, ID (A)
10.00
0. 1 m
60
s
1.00
40
lim n) nt S(o re R D ur to Ce du
it
s 1m
0.10 20 Refer to figure 1 for MOSFET SOA temperature derating coefficient 0.01 0 25 50 75 100 125 150 Temperature, TF (C) 1 10 100 1000
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0
Drain-to-Source Voltage, VDS (V)
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
Figure 3 - MOSFET Avalanche Energy Derating Curve
100 EAS Temperature Derating Coefficient (%) (C/W) Transient Thermal Resistance, R
JC
Figure 4 - Transient Thermal Resistance
10.00
80
1.00
60
40
0.10
20
0 25 50 75 100 125 150 Channel Junction Temperature, TJ (C)
0.01
1
10
100 Time, t (s)
1m
10m
100m
Figure 5 - MOSFET Power Dissipation versus Temperature
30
25 Power Dissipation, PD1 (W)
20
With infinite heatsink PD1 = 25 W at TA 25C
15
10
5
Without heatsink PD1 = 1.3 W at TA 25C 0 20 40 60 80 100 120 140 160
0 Ambient Temperature, TA (C)
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Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
ELECTRICAL CHARACTERISTICS valid at VCC = 18 V, TA = 25C, unless otherwise specified Characteristic
Power Supply Start-up Operation Operation Start Voltage Operation Stop Voltage Circuit Current in Operation Circuit Current in Non-Oscillation Circuit Current in Non-Operation Start-up Current Bias Assist Voltage Normal Operating Characteristics FM/ELP High Threshold Voltage FM/ELP Low Threshold Voltage FM/ELP Voltage Hysteresis FM/ELP Outflow Current1 FM/ELP Inflow Current1 Average Switching Frequency Frequency Jitter Deviation Maximum Duty Cycle FB Maximum Feedback Current1 Burst Threshold Voltage Slope Compensation Start-up Duty Cycle VFM(H) VFM(L) VFMhys IFMsrc IFMsink fOSC(av) f DMAX IFB(MAX) Vburst(th) DSLP SLP 7-5 7-5 7-5 7-5 7-5 1-5 1-5 1-5 6-5 6-5 6-5 6-5 (FM/ELP terminal voltage at which IFM changes from -13 A to 13 A) Measurement circuit 2 (FM/ELP terminal voltage at which IFM changes from 13 A to -13 A) Measurement circuit 2 (VFM(H) - VFM(L)) Measurement circuit 2 (FM/ELP terminal outflow current at VFM = VFM(L)) Measurement circuit 2 (FM/ELP terminal inflow current at VFM = VFM(H)) Measurement circuit 2 (D/ST terminal average oscillation frequency) Measurement circuit 2 fOSC (peak-to-peak) Measurement circuit 2 (Maximum width of the low portion of the D/ST terminal waveform) Measurement circuit 2 (FB terminal outflow current at VFB = 0 V) Measurement circuit 3 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 DSLP = (t3 / t4) x 100 (see figure for measurement circuit 4 for values of t) Measurement circuit 4 SLP = 0.02 / (t2 - t1) (see figure for measurement circuit 4 for values of t) Measurement circuit 4 4.0 2.4 1.3 -17.4 8.6 60 4.8 71 -220 0.99 - -22 4.5 2.8 1.7 -13 13 67 6.9 75 -160 1.10 27 -17 5.0 3.2 1.9 -8.6 17.4 74 9 79 -100 1.21 - -12 V V V A A kHz kHz % A V % mV/s VCC(ON) VCC(OFF) ICC(ON) ICC(STOP) ICC(OFF) Istartup VBIAS 4-5 4-5 4-5 4-5 4-5 4-5 4-5 (VCC voltage at which operation starts) Measurement circuit 1, VCC = 0 through 13.9 through 17.1 V (VCC voltage at which operation stops) Measurement circuit 1, VCC = 17.1 through 9.8 to 8.0 V (Inflow current into VCC terminal in oscillation) Measurement circuit 1 (Inflow current into VCC terminal at VFB = 0 V) Measurement circuit 1 (Inflow current into VCC terminal prior to oscillation) Measurement circuit 1, VCC = 13.8 (Inflow current into D/ST terminal) Measurement circuit 7, VCC = 0, D/ST = 450 V (VCC voltage at which Istartup starts, and IstartupBias begins) Measurement circuit 7, VCC = 17.1 through 13.6 to 16.8 V 13.9 8.0 - - - -0.9 13.6 15.5 8.9 1.4 0.8 5 -1.6 15.2 17.1 9.8 2.8 1.3 20 -2.3 16.8 V V mA mA A mA V
Symbol Terminal
Test Conditions
Min.
Typ.
Max
Units
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Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
ELECTRICAL CHARACTERISTICS, continued, valid at VCC = 18 V, TA = 25C, unless otherwise specified Characteristic
Protection Operation OCP Threshold Voltage at Zero Duty Cycle (0% On-Duty) Drain Peak Current Compensation Coefficient OCP Threshold Voltage After Compensation Leading Edge Blanking Time OLP Delay Time Circuit Current in OLP-Operation VOCP1 DPC VOCP2 tblank tOLP ICC (OLP) 3-5 - 3-5 1-5 1-5 4-5 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 DPC = -0.75x SLP / fOSC(av) VOCP2 = DPC x DMAX + VOCP1 (The low portion of the D/ST terminal waveform at VOCP = 2 V) Measurement circuit 5 (Time between setting FB terminal open and when oscillation stops) Measurement circuit 6 (Inflow current into VCC terminal after OLP operation) Measurement circuit 6 (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 (Inflow current into VCC terminal after OVP operation) Measurement circuit 1, VCC = 8 V (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 (FM/ELP terminal voltage at which the oscillation of the D/ST terminal waveform is stopped by increasing VFM) Measurement circuit 2 (Inflow current at VFM = VELP) Measurement circuit 2 0.71 1.5 0.82 280 - - 0.78 1.9 0.93 400 200 410 0.86 2.3 1.04 520 - 700 V mV/ DC% V ns ms A
Symbol Terminal
Test Conditions
Min.
Typ.
Max
Units
OVP Protection Voltage
VCC(OVP)
4-5
27
28.5
30
V
Latch Circuit Sustaining Current2 Latch Circuit Release Voltage2
ICC(La.H) VCC(La.OFF)
4-5 4-5
- 6.4
140 7.1
220 7.8
A V
ELP Threshold Voltage Inflow Current at External Latch Protection Thermal Shut Down Operating Temperature Power MOSFET Characteristics Drain-to-Source Breakdown Voltage Drain Leakage Current ON-Resistance Switching Time Thermal Resistance Single Pulse Avalanche Energy
1Input
VELP IELP TJTSD
7-5 7-5 -
6.4 - 135
7.1 55 -
7.8 100 -
V A C
VDSS IDSS RDS(ON) tr RJ-F EAS
1-3 1-3 1-3 1-3 - -
ID = 300 A, Measurement circuit 8 VD = 650 V, Measurement circuit 7 ID = 0.6 A, VFM = 0 V Measurement circuit 10 Measurement circuit 9 Measured between junction and internal frame Measurement circuit 11
650 - - - - -
- - - - - -
- 300 3.95 400 2.23 -
V A ns C/W -
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and output current polarity at the device pin; plus(+) represents sink and minus(-) represents source.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
Measurement Circuit 1
VCC(OVP) 32V
STR-W6200D
D/ST
1
VCC(ON) 13.8V
FB FM/ ELP
7
18V
S/OCP VCC GND
3 4 5 6
VCC VFM VFB 0V 0V
5V
VCC(OFF) 3.65V 2V VOFF(FM) 0V
8V
VCCc(La.OFF)
VD 100 VDD 10V A ICC VCC
+
1F VFB VFM
VD
ICC ICC(OFF) ICC(STOP) ICC(ON) ICC(La.H)
Measurement Circuit 2
18V VCC VFB 0V VFMH VFM 4.5Vtyp VFML 2.8Vtyp Isrc(FM) Isnk(FM) t2 5V 0V VELP VLFM+(VFMH-VFML)/2 IELP
f =f osc(Hi)-f osc(Lo) Dmax= t2/ t1100
5V
STR-W6200D
D/ST
1
S/OCP VCC GND
3 4 5 6
FB
FM/ ELP
7
VD 100 18V VDD 10V VCC
+
IFM A
IFM 0A
1F VFB VFM VD
fosc(Hi)
fosc(Lo)
fosc(av) t1
Measurement Circuit 3
18V VCC 5V VFM 0V 5V
FB
6
5V
STR-W6200D
D/ST
1
S/OCP VCC GND
3 4 5
FM/ ELP
7
VFB
VHYS Vburst 0V
5V
VD 100 www..com VDD 10V
+
IFB A VFM VFB VD 18V VCC
1F
-IFB
IFB(MAX)
IFB(MIN)
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
Measurement Circuit 4
18V VCC VFM 5V
3.65V 4V Internal feedback signal 0.68V V1-0.04V V1-0.02V t4 V1
STR-W6200D
D/ST
1
S/OCP VCC GND
3 4 5 6
FB
FM/ ELP
7
VFB
VD 100
VOCP
+
VFB 4V
VFM
VOCP
18V VDD 10V VCC
1F
VD DSLP= t3 / t4 100 SLP = 0.02 / (t2-t1) t1 t2 t3 t5(tblank)
Measurement Circuit 5
18V VCC 5V 3.65V 2V VOCP1 VOCP 0V tblank VFM VD VD(Lo)
STR-W6200D
D/ST
1
VFM
FB FM/ ELP
7
0V
S/OCP VCC GND
3 4 5 6
VD 100
VOCP
+
18V VDD 20V VCC
1F
VOCP2 = (-0.75 x SLP x DMAX / fOSC(av)) + VOCP1
Measurement Circuit 6
18 V VCC
STR-W6200D
D/ST
1
S/OCP VCC GND
3 4 5 6
FB
FM/ ELP
7
VFM SW ON OFF VFB
t FM 7.8 V typ
VD www..com A 100
ICC
VFB
+
1F VDD 10V VCC 18V
SW
VFM 47nF VD ICC(OLP) tOLP(= tFM 16)
ICC
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
Measurement Circuit 7
400V VDD 18V VBIAS 650V
STR-W6200D
D/ST
1
S/OCP VCC GND
3 4 5 6
FB
FM/ ELP
7
VCC VFM
0V 0V
13V 5V
ID A
ICC
A ID
+
VDD
VCC
VFM
IDSS ICC ISTARTUP
1F
Measurement Circuit 8
Measurement Circuit 9
STR-W6200D
D/ST
1
S/OCP VCC GND
3 4 5 6
FB
FM/ ELP
7
STR-W6200D
D/ST S/OCP
1 3 4
VCC GND
5 6
FB
FM/ ELP
7
VD
10V 90%
VD V ID 300 A 18V VCC
+
VD VFM 47nF 100 18V VDD 10V VCC
+
VFM 47nF tr
10%
1F
1F
Measurement Circuit 10
18V
STR-W6200D
D/ST
1
VCC
FB FM/ ELP
7
S/OCP VCC GND
3 4 5 6
5V VFM 0V
VD www..com V ID 0.6A
+
18V VCC
1F
VFM
VD
VD(Lo) RDS(ON)=VD(Lo) / 0.6
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
Measurement Circuit 11
Vcc
18V
STR-W6200D
D/ST S/OCP VCC GND
4 5 6
FB
FM/ ELP
7
VGS
8V
L VDD
1
3
+
VDSpeak IL VDS VDD
VDS 18V VGS VCC
1F
t
TYPICAL APPLICATION CIRCUIT
V IN ( ac)
O UT
1 D/ST
4 VCC
S T R -W 6200D
FM / S/O C P ELP 3 7 GND 5 FB 6
G ND
Option
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Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
PACKAGE DIMENSIONS, TO-220
7.9 0.2
Branding 2.8 MAX
XXXXXXXX XXXXXXXX
16.9 0.3
2.6 0.1 Terminal dimension at case surface 5.0 0.5
1.34 -0.1
+0.2
(5.4)
1.74 -0.1
+0.2
6xP1.27 0.15 = 7.62 0.15 Terminal dimensions at case surface
0.45 -0.1
+0.2
5.08 0.6 Terminal dimension at lead tips
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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
Leadframe plating Pb-free. Device composition complies with the RoHS directive.
10.4 0.5
O3.2 0.2
Gate Burr
4 0.2
10.0 0.2
4.2 0.2 2.8 0.2
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
1) xR (2
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STR-W6251D
30 W-Universal Input/45 W-230 Vac Input PWM Switching Regulators
PACKING SPECIFICATIONS Minimum packing option: Tube FM-205 E
4.8
+0.4 0
1.4
5.1 9 x R0.6 8.9 9.5-0.1 (15.4)
+0.3
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
2.85 (3.6) 14.3
35.0
Side marked "ANTISTATIC"
1.3 -0.2
+0.3
Spacer
Carton (side view)
Shipping Carton Dimensions: Capacity: 1800 pieces maximum per carton 36 tubes per carton 3 rows, 12 tubes per row
Tube
Spacer
620
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125
Tube
All dimensions: mm
185
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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 G746 YG6260 Suppliers Shin-Etsu Chemical Co., Ltd. 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)
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Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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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 wconfirmation of your h e efica4 U . c o m w w . D a t a S speci t tions. 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
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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
Singapore Sanken Electric Singapore Pte. Ltd.
150 Beach Road, #14-03 The Gateway West Singapore 189720 Tel: 65-6291-4755, Fax: 65-6297-1744
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
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
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
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
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
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
www..com
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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Price & Availability of STRW6251D

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