Datasheet STRW6252 Specification

STR-W6252D

60 W -Universal Input/40 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

Continued on the next page…

Package: TO-220

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

Not to scale

FM/ELP

Functional Block Diagram

7.1 V

RST

R

SQ

RQ

S

OLP

S1

=

OLP

t

×

32

FM

R

OCP

Feedback

Control

PWM OSC

Frequency

7.8 V

REG

VREG

75%

D

MAX

SQ

R

160

A

OVP

28.5 V

ELP

7.1 V

TSD

Slope

Compe nsati on

S2 Q

CK

t

UVLO

15.5 V/ 8.9 V

Modulation

12 V

FB

STARTUP

I

=1.6 mA

Drain Peak
Current
Compensation

startup

DRV

LEB

D/STVCC

S/OCP

GND

28103.52

STR-W6252D

Features and Benefits (continued)

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

▪ 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

= 5 μA (typical) at V

CC(off)

= 13.8 V

CC

▪ Slope compensation circuit stabilizes operation, preventing

interference from subharmonics

▪ Leading Edge Blanking

Selection Guide

Part Number Packing

STRW6252D 50 pieces per tube

▪ 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

Pin-out Diagram

1234567

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

, of 25°C, unless oth er wise stated.

A

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

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

Source/Overcurrent Protection
terminal

Frequency jittering and External
Latch Protection terminal

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

MOSFET source and input of overcurrent
detection signal

Control input for frequency jittering control, and
External Latch Protection

2

60 W -Universal Input/40 W-230 Vac Input

STR-W6252D

PWM Switching Regulators

ABSOLUTE MAXIMUM RATINGS at TA = 25°C

Characteristic Symbol Terminal Note Rating Unit

Drain Current

Maximum Switching Current

Single Pulse Avalanche Energy

S/OCP Terminal Voltage V

FM/ELP Terminal Voltage V

FM/ELP Terminal Inflow Current I

FB Terminal Voltage V

Controller (MIC) Input Voltage V

MOSFET Power Dissipation

Controller (MIC) Power Dissipation P

Operating Internal Frame Temperature T

Operating Ambient Temperature T

Storage Temperature T

Channel Junction Temperature T

1

Refer to figure 1

2

I

DMAX

3

Refer to figure 3

4

Refer to figure 4

1

2

3

4

I

Dpeak

I

DMAX

E

I

Dpeak

P

AS

OCP

FM

FM

FB

CC

D1

D2

F

op

stg

J

1-3 Single Pulse 3.2 A

1-3 TA = –20 to 125°C 3.2 A

1-3 Single Pulse 62 mJ

1-3 V

= 99 V, L = 20 mH 2.3 A

DD

3-5 –6 to 6 V

7-5 –0.3 to 12 V

7-5 3 mA

6-5 –0.3 to 9 V

4-5 0 to 32 V

8-1

With infinite heatsink 26 W

Without heatsink 1.3 W

5-3 For Vcc×Icc 0.8 W

– Refer to T

OP

– –20 to 115 °C

– –40 to 125 °C

– 150 °C

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

–20 to 115 °C

Figure 1 – MOSFET Safe Operating Area

Derating Curve

100

80

60

40

Safe Operating Area

20

Temperature Derating Coefficient (%)

0

0 255075100125150

Temperature, TF (°C)

Figure 2 – MOSFET Safe Operating Area

Drain Current versus Voltage

at T

= 25°C, Single Pulse

A

100.00

10.00

(A)

D

1.00

DS(on)

o R

Current limit

Drain Current, I

0.10

0.01

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

due t

Refer to figure 1 for MOSFET SOA
temperature derating coefficient

Drain-to-Source Voltage, VDS (V)

0.1 ms

1 ms

10 100 10001

3

STR-W6252D

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

Figure 3 – MOSFET Avalanche Energy Derating Curve

100

80

60

40

20

Temperature Derating Coefficient (%)

AS

E

0

25 50 75 100 125 150

Channel Junction Temperature, TJ (°C)

Figure 5 – MOSFET Power Dissipation versus Temperature

30

Figure 4 – Transient Thermal Resistance

10.00

(°C/W)

QJC

1.00

0.10

Transient Thermal Resistance, R

0.01
10010 10m1m 100m1

Time, t (s)

25

(W)

20

D1

15

10

Power Dissipation, P

5

0

0 20 40 60 80 100 120 140 160

Without heatsink

PD1= 1.3 W at TA 25°C

Ambient Temperature, TA (°C)

With infinite heatsink

PD1= 26 W at TA 25°C

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

4

60 W -Universal Input/40 W-230 Vac Input

STR-W6252D

PWM Switching Regulators

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

Operation Stop Voltage V

Circuit Current in Operation I

Circuit Current in Non-Oscillation I

CC(STOP)

Circuit Current in Non-Operation I

Start-up Current I

Bias Assist Voltage V

CC(ON)

CC(OFF)

CC(ON)

CC(OFF)

startup

BIAS

4-5

4-5

4-5

4-5

4-5

4-5

4-5

Operating Characteristics

FM/ELP High Threshold Voltage V

FM/ELP Low Threshold Voltage V

FM/ELP Voltage Hysteresis V

FM/ELP Outflow Current

FM/ELP Inflow Current

1

1

Average Switching Frequency f

FM(H)

FM(L)

FMhys

I

FMsrc

I

FMsink

OSC(av)

7-5

7-5

7-5 (V

7-5

7-5

1-5

Frequency Jitter Deviation ∆f 1-5 f

Maximum Duty Cycle D

FB Maximum Feedback Current

1

I

Burst Threshold Voltage V

Slope Compensation Start-up
Duty Cycle

MAX

FB(MAX)

burst(th)

D

SLP

1-5

6-5

6-5

6-5

Slope Compensation Rate SLP 6-5

(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 I

starts, and I

startup

startupBias

begins) Measurement circuit 7, VCC = 17.1 through

13.6 to 16.8 V

(FM/ELP terminal voltage at which IFM changes from
–13 μA to 13 μA) Measurement circuit 2

(FM/ELP terminal voltage at which IFM changes from
13 μA to –13 μA) Measurement circuit 2

– V

FM(H)

) Measurement circuit 2 1.4 1.7 1.8 V

FM(L)

(FM/ELP terminal outflow current at VFM = V
Measurement circuit 2

(FM/ELP terminal inflow current at VFM = V

FM(H)

Measurement circuit 2

(D/ST terminal average oscillation frequency)
Measurement circuit 2

(peak-to-peak) Measurement circuit 2 4.8 6.9 9 kHz

OSC

(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 V

= 0 V and decrease VFB (V

FM

burst(th)

is the FB
terminal voltage level at which D/ST changes from
low to high) Measurement circuit 3

D

= (t3 / t4) × 100 (see figure for measurement

SLP

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

FM(L)

13.9 15.5 17.1 V

8.0 8.9 9.8 V

– 1.4 2.8 mA

– 0.8 1.3 mA

–520μA

–0.9 –1.6 –2.3 mA

13.6 15.2 16.8 V

4.0 4.5 5.0 V

2.4 2.8 3.2 V

)

–17.4 –13 –8.6 μA

)

8.6 13 17.4 μA

60 67 74 kHz

71 75 79 %

–220 –160 –100 μA

0.99 1.10 1.21 V

–27– %

–22 –17 –12 mV/μs

Continued on next page…

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

5

60 W -Universal Input/40 W-230 Vac Input

STR-W6252D

PWM Switching Regulators

ELECTRICAL CHARACTERISTICS, continued, valid at VCC = 18 V, TA = 25°C, unless otherwise specified

Characteristic Symbol Terminal Test Conditions Min. Typ. Max Units

Protection Operation

Set V

= 0 V and increase V

OCP Threshold Voltage at Zero
Duty Cycle (0% On-Duty)

Drain Peak Current Compensation
Coefficient

OCP Threshold Voltage After
Compensation

Leading Edge Blanking Time t

OLP Delay Time t

Circuit Current in OLP-Operation I

V

OCP1

D

PC

V

OCP2

blank

OLP

CC (OLP)

3-5

–DPC = –0.75× SLP / f

3-5 V

1-5

1-5

4-5

FM

terminal voltage level at which D/ST changes from
low to high) Measurement circuit 5

OSC(av)

= DPC × D

OCP2

MAX

+ V

OCP1

(The low portion of the D/ST terminal waveform at
V

= 2 V) Measurement circuit 5

OCP

(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

OVP Protection Voltage V

CC(OVP)

4-5

terminal is switched from low to high by decreasing
VFB after setting V

= 0 V) Measurement circuit 1,

FM

VCC = 18.0 V through 27 to 30 V

Latch Circuit Sustaining Current

Latch Circuit Release Voltage

2

2

I

CC(La.H)

V

CC(La.OFF)

4-5

4-5

(Inflow current into VCC terminal after OVP operation)
Measurement circuit 1, VCC = 7.8 V

(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

(FM/ELP terminal voltage at which the oscillation of

ELP Threshold Voltage V

ELP

7-5

the D/ST terminal waveform is stopped by increasing
VFM) Measurement circuit 2

Inflow Current at External Latch
Protection

Thermal Shut Down Operating
Temperature

I

T

ELP

JTSD

7-5 (Inflow current at VFM = V

– 135 – – °C

Power MOSFET Characteristics

Drain-to-Source Breakdown Voltage V

Drain Leakage Current I

ON-Resistance R

Switching Time t

Thermal Resistance R

Single Pulse Avalanche Energy E

1

Input and output current polarity at the device pin; plus(+) represents sink and minus(–) represents source.

2

The latch circuit means a circuit operated ELP, OVP, and TSD.

DSS

DSS

DS(ON)

r

θJ-F

AS

1-3 ID = 300 μA, Measurement circuit 8 650 – – V

1-3 VD = 650 V, Measurement circuit 7 – – 300 μA

1-3 ID = 1.0 A, VFM = 0 V Measurement circuit 10 – – 2.8 Ω

1-3 Measurement circuit 9 – – 400 ns

– Measured between junction and internal frame – – 2.04 °C/W

– Measurement circuit 11 – – – –

(V

OCP.

is the S/OCP

OCP1

0.71 0.78 0.86 V

1.5 1.9 2.3

0.82 0.93 1.04 V

280 400 520 ns

27 28.5 30 V

6.4 7.1 7.8 V

6.4 7.1 7.8 V

) Measurement circuit 2 – 55 100 μA

ELP

mV/

DC%

– 200 – ms

– 410 700 μA

– 140 220 μA

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

6

STR-W6252D

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

Measurement Circuit 1

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

100

V

DD

V

10V

A

CC

I

CC

V

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

V

100

18V

DD

V

10V

CC

V

+

1F

+

1F

VFBV

V

OFF( FM)

V

32V

V

0V

CC(OFF)

8V

CC(La.H)

I

CCc(La.OFF)

V

FM/

FM

ELP

CC(OVP)

V

5V

CC(STOP)

I

18V

3.65V

2V

CC(ON)

I

CC(ON)

V

13.8V

CC

V

FM

V

FB

V

D

V

CC

I

0V

0V

CC(OFF)

I

Measurement Circuit 2

18V

CC

V

FB

V

FM/

ELP

FB

V

FM

I

FM

I

A

0A

FM

V

V

0V

FMH

V

FM

D

5V

4.5Vty p

snk( FM)

I

0V

2.8Vty p

FML

V

src(FM)

I

5V

LFM

FMH-VFML

V

+(V

࡮

f =f osc(Hi)-f osc(Lo)

࡮

Dmax=t2/ t1100

ELP

V

)/2

ELP

I

t2

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

V

100

18V

DD

V

10V

CC

V

+

1F

osc( av)

osc(Hi)

f

osc(Lo)

f

f

t1

Measurement Circuit 3

18V

CC

V

FM

V

FM/

ELP

FB

I

A

FM

V

FB

V

FB

V

D

V

FB

I

5V

0V

2V

Vburst

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

0V

FB(MAX)

I

7

STR-W6252D

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

V

OCP

100

V

V

DD

10V

18V

V

+

1F

CC

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

Measurement Circuit 4

18V

CC

V

5V

FM

V

FM/

ELP

FB

V

Internal feedback signal

0.68V

FB

FM

V

V

OCP

V

V1-0.04V

4V

D

V

SLP

= t3 / t 4100

D

࡮

LP

= 0.02 / (t2-t1)

S

࡮

t1 t2

Measurement Circuit 5

3.65V

4V

V1-0.02V

V1

t4

t3

t5(t

blank

)

STR-W6200D

D/ST S/OCP VCC GND FB

3 4 5 6 74 6

1

D

V

OCP

V

100

ǡ

DD

V

20V

18V

V

CC

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

CC

I

D

100

V

V

DD

10V

A

CC

18V

V

+

1F

+

1F

V

SW

18V

CC

V

FM/

ELP

5V

FM

V

OCP

V

0V

FM

V

D

V

V

= (–0.75 × SLP × D

OCP2

0V

OCP1

V

D( Lo)

V

/ f

OSC(av)

) + V

MAX

OCP1

3.65V

2V

t

blank

Measurement Circuit 6

18 V

CC

V

FM

FM/

ELP

FB

FM

V

47nF

V

SW ONψOFF

FB

V

D

V

CC

I

FM

t

7.8 V ty p

CC(OLP)

I



OLP

FM

t

(= t

16)

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

8

STR-W6252D

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

Measurement Circuit 7

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

I

A

CC

I

A

DD

CC

V

V

Measurement Circuit 8 Measurement Circuit 9

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

V

D

I

V

18V

300

A



CC

V

+

1F

+

1F

FM/

ELP

FM/

ELP

FM

V

FM

V

47nF

DD

V

CC

V

FM

V

D

I

CC

I

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

D

V

100

18V

DD

V

10V

CC

V

+

1F

400V

0V

0V

STAR TUP

I

FM/

ELP

18V

FM

V

47nF

650V

BIAS

V

13V

5V

DSS

I

D

V

10V

90%

10%

tr

STR-W6200D

D/ST S/OCP VCC GND FB

3 4 5 6 74 6

1

D

V

V

D

I

18V

0.6A

CC

V

+

1F

FM/

ELP

Measurement Circuit 10

18V

CC

V

5V

FM

V

FM

V

D

V

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

0V

D(Lo)

V

DS(ON)=VD(Lo)

R

/1.0

9

STR-W6252D

L

DD

V

STR-W6200D

D/ST S/OCP VCC GND FB

1

3 4 5 6 74 6

DS

V

18V

CC

GS

V

V

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

Measurement Circuit 11

Vcc 18V

+

1F

FM/

ELP

GS

V

L

I

DS

V

t

8V

DSpeak

V

DD

V

VIIN ( ac)

TYPICAL APPLICATION CIRCUIT

1 4

STR -W 6200D

FM /

ELP

S/OCP

3 7 5 6

GND

VCCD/ST

FB

Optio n

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

OUT

GND

10

STR-W6252D

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

PACKAGE DIMENSIONS, TO-220

Branding

1.34

1.74

+0.2
–0.1

+0.2
–0.1

10.0 ±0.2

Gate Burr

XXXXXXXX
XXXXXXXX

4 ±0.2

7.9 ±0.2

16.9 ±0.3

2.8 MAX

6×P1.27 ±0.15 = 7.62 ±0.15
Terminal dimensions at case surface

5.0 ±0.5

(5.4)

0.45

(2×R

+0.2
–0.1

4.2 ±0.2

2.8 ±0.2

Ø3.2 ±0.2

2.6 ±0.1

Terminal dimension at case surface

1)

10.4 ±0.5

5.08 ±0.6
Terminal dimension at lead tips

1234567

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: W6252
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.

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

11

STR-W6252D

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

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

Shipping Carton Dimensions:
Capacity: 1800 pieces maximum per carton
36 tubes per carton
3 rows, 12 tubes per row

Carton
(side
view)

Spacer

Tube

Spacer

4.8

(3.6)

2.85

+0.4
0

1.4

14.3

5.1
9 × R0.6

+0.3

9.5

+0.3

1.3

–0.2

8.9

–0.1

35.0

(15.4)

Side marked
“ANTISTATIC”

All dimensions: mm

0

2

6

125

1

8

5

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

Tube

12

60 W -Universal Input/40 W-230 Vac Input

STR-W6252D

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. 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.

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 Toshiba 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

SC102 Dow Corning Toray Silicone Co., Ltd.

• 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)

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

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STR-W6252D

60 W -Universal Input/40 W-230 Vac Input

PWM Switching Regulators

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 equip­ment, 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 SSE23677

115 Northeast Cutoff, Box 15036

Allegro MicroSystems, Inc.

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

14

STR-W6252D

60 W -Universal Input/40 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: [phone], Fax: [phone]

Sanken Electric (Shanghai) Co., Ltd.

Room 3202, Maxdo Centre

Xingyi Road 8, Changning District

Shanghai, China

Tel: [phone], Fax: [phone]

Taiwan Sanken Electric Co., Ltd.

Room 1801, 18th Floor

88 Jung Shiau East Road, Sec. 2

Taipei 100, Taiwan R.O.C.

Tel: [phone], Fax: [phone]

Japan

Sanken Electric Co., Ltd.

Overseas Sales Headquarters

Metropolitan Plaza Building

1-11-1 Nishi-Ikebukuro, Toshima-ku

Tokyo 171-0021, Japan

Tel: [phone], Fax: [phone]

Singapore

Sanken Electric Singapore Pte. Ltd.

150 Beach Road, #14-03 The Gateway West
Singapore 189720
Tel: [phone], Fax: [phone]

Europe

Sanken Power Systems (UK) Limited

Pencoed Technology Park
Pencoed, Bridgend CF35 5HY, United Kingdom
Tel: [phone], Fax: [phone]

North America
United States

Allegro MicroSystems, Inc.

115 Northeast Cutoff
Worcester, Massachusetts 01606, U.S.A.
Tel: [phone], Fax: [phone]

Allegro MicroSystems, Inc.

14 Hughes Street, Suite B105
Irvine, California 92618, U.S.A.
Tel: [phone], Fax: [phone]

Korea

Sanken Electric Korea Co., Ltd.

Samsung Life Yeouido Building 16F

23-10, Yeouido-Dong, Yeongdeungpo-gu

Seoul 150-734, Korea

Tel: [phone], Fax: [phone]

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

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