STR-W6251D
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
PWM Switching Regulators
Functional Block Diagram
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
D
MA X
75%
28.5 V
7.8 V
GND
FM/ELP
160 A
R
SQ
SQ
R
7.1 V
Slope
Compensa tion
Drain Peak
Current
Compensation
VREG
STARTUP
Istartup
=1.6 mA
S2 Q
CK
S1
R
OLP
t
OLP
=
t
FM
×
32
Frequency
Modulation
RQ
S
UVLO
ELP
RST
7.1 V
OVP
Feedback
Control
OCP
12 V
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
2
Allegro 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:
ICC(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, TA, 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
terminal
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
Latch Protection terminal
Control input for frequency jittering control and
External Latch Protection
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ABSOLUTE MAXIMUM RATINGS at TA = 25°C
Characteristic Symbol Terminal Note Rating Unit
Drain Current1IDpeak 1-3 Single Pulse 2.6 A
Maximum Switching Current2IDMAX 1-3 TA = –20 to 125°C 2.6 A
Single Pulse Avalanche Energy3EAS 1-3 Single Pulse 47 mJ
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 Dissipation4PD1 8-1 With infinite heatsink 25 W
Without heatsink 1.3 W
Controller (MIC) Power Dissipation PD2 5-3 For Vcc×Icc 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
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, T
F
(°C)
Safe Operating Area
Temperature Derating Coefficient (%)
0
20
40
60
80
100
0 255075100125150
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
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Channel Junction Temperature, T
J
(°C)
E
AS
Temperature Derating Coefficient (%)
0
20
40
60
80
100
25 50 75 100 125 150
Time, t (s)
Transient Thermal Resistance, RQJC (°C/W)
1.00
0.10
0.01
10.00
1001010m1m 100m1
Ambient Temperature, TA (°C)
Power Dissipation, PD1 (W)
0
5
10
15
20
25
30
0 20 40 60 80 100 120 140 160
P
D1
= 1.3 W at T
A
25°C
Without heatsink
With infinite heatsink
P
D1
= 25 W at T
A
25°C
Figure 3 – MOSFET Avalanche Energy Derating Curve Figure 4 – Transient Thermal Resistance
Figure 5 – MOSFET Power Dissipation versus Temperature
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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 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
Circuit Current in Operation 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 –520μA
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
Normal Operating Characteristics
FM/ELP High Threshold Voltage VFM(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 VFM(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 VFMhys 7-5 (VFM(H) – VFM(L)) Measurement circuit 2 1.3 1.7 1.9 V
FM/ELP Outflow Current1IFMsrc 7-5 (FM/ELP terminal outflow current at VFM = VFM(L))
Measurement circuit 2 –17.4 –13 –8.6 μA
FM/ELP Inflow Current1IFMsink 7-5 (FM/ELP terminal inflow current at VFM = VFM(H))
Measurement circuit 2 8.6 13 17.4 μA
Average Switching Frequency fOSC(av) 1-5 (D/ST terminal average oscillation frequency)
Measurement circuit 2 60 67 74 kHz
Frequency Jitter Deviation ∆f 1-5 fOSC (peak-to-peak) Measurement circuit 2 4.8 6.9 9 kHz
Maximum Duty Cycle DMAX 1-5 (Maximum width of the low portion of the D/ST
terminal waveform) Measurement circuit 2 71 75 79 %
FB Maximum Feedback Current1IFB(MAX) 6-5 (FB terminal outflow current at VFB = 0 V)
Measurement circuit 3 –220 –160 –100 μA
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) × 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/μs
Continued on next page…
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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 DPC –D
PC = –0.75× SLP / fOSC(av) 1.5 1.9 2.3 mV/
DC%
OCP Threshold Voltage After
Compensation VOCP2 3-5 VOCP2 = DPC × 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 μA
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 Current2ICC(La.H) 4-5 (Inflow current into VCC terminal after OVP operation)
Measurement circuit 1, VCC = 8 V – 140 220 μA
Latch Circuit Release Voltage2VCC(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 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 μA
Thermal Shut Down Operating
Temperature TJTSD – 135 – – °C
Power MOSFET Characteristics
Drain-to-Source Breakdown Voltage VDSS 1-3 ID = 300 μA, Measurement circuit 8 650 – – V
Drain Leakage Current IDSS 1-3 VD = 650 V, Measurement circuit 7 – – 300 μA
ON-Resistance RDS(ON) 1-3 ID = 0.6 A, VFM = 0 V Measurement circuit 10 – – 3.95 Ω
Switching Time tr1-3 Measurement circuit 9 – – 400 ns
Thermal Resistance RθJ-F – Measured between junction and internal frame – – 2.23 °C/W
Single Pulse Avalanche Energy EAS – 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
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
13.8V
V
CC(ON)
V
CC(OFF)
18V
I
CC(OFF)
V
CC
V
D
I
CC
V
CCc(La.OFF)
8V
I
CC(La.H)
I
CC(STOP)
32V
V
D
V
FM
V
FML
V
FMH
V
LFM
+(V
FMH
-V
FML
)/2
I
FM
f
osc( av)
t1
I
snk(FM)
f
osc(Hi)
f
osc(Lo)
t2
f =f osc(Hi)-f osc(Lo)
Dmax= t2/ t1100
I
src(FM)
0A
4.5Vtyp
2.8Vtyp
V
ELP
1F
V
CC
100A
+
I
CC
V
DD
10V
V
D
100
V
DD
10V
V
D
A
I
FM
V
FM
18V
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
100
V
DD
10V
V
D
A
I
FB
V
FB
V
FM
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
I
CC(ON)
V
FB
5V
V
FB
V
FM
V
FM
V
CC(OVP)
2V
3.65V
0V
1F
V
CC
+
18V 1F
V
CC
+
0V
0V
V
CC
18V
V
FB
0V
V
FB
5V
V
FM
Vburst
V
FB
V
D
0V
I
FB(MAX)
-I
FB
V
HYS
5V
0V
V
CC
18V
V
OFF(FM)
I
ELP
I
FB(MIN)
5V
5V
0V
5V
5V
Measurement Circuit 1
Measurement Circuit 2
Measurement Circuit 3
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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
0V
2V
VFM
VD
ICC
100
VDD 10V
VD
tOLP(= tFM16)
ICC(OLP)
tFM
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
VFM
5V
0V
3.65V
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
VFB
7.8 V typ
VFB
VFM
18V 1F
VCC
+
VOCP
100ǡ
VDD 20V
VD
1
VFM
47nF
1F
VCC
A
+
ICC
18V
VCC
18V
VCC
18 V
SW ONψOFF
SW
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
VFB
4V
VFM
18V 1F
VCC
+
VOCP
100
VDD 10V
VD
VFB
VD
4V
VOCP
Internal feedback signal
V1-0.04V V1-0.02V
t1 t2
t4
0.68V
VCC
18V
VFM
3.65V
5V
t3 t5(tblank)
DSLP= t3 / t4 100
SLP = 0.02 / (t2-t1)
V1
VOCP2 = (–0.75 × SLP × DMAX / fOSC(av)) + VOCP1
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
9
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
10V
90%
10%
tr
V
DD
A
I
D
I
D
V
D
V
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
V
D
100
V
DD
10V
V
D
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
R
DS(ON)
=V
D(Lo)
/0.6
1F
V
CC
+
V
FM
V
FM
47nF
18V 1F
V
CC
+
V
FM
47nF
18V 1F
V
CC
+
V
D
V
D(Lo)
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
V
FM
5V
0V
V
FM
18V 1F
V
CC
+
1
I
D
V
D
V
0.6A
V
CC
18V
A
I
CC
300
A
V
DD
V
CC
I
D
650V
13V
I
DSS
V
FM
18V
5V
V
BIAS
0V
0V
400V
I
STARTUP
I
CC
Measurement Circuit 7
Measurement Circuit 8 Measurement Circuit 9
Measurement Circuit 10
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
10
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
TYPICAL APPLICA TION 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
1
D/ST S/OCP VCC GND FB
FM/
ELP
STR-W6200D
3 4 5 6 74 6
18V 1F
VCC
+
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
11
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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 ±0.2
2.8 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
6×P1.27 ±0.15 = 7.62 ±0.15
Terminal dimension at lead tips
Leadframe plating Pb-free. Device composition
complies with the RoHS directive.
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
12
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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
0
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
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
13
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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 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:
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 MΩ 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 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.
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
14
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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
30 W-Universal Input/45 W-230 Vac Input
PWM Switching Regulators
STR-W6251D
15
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
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
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
Worldwide Contacts
