Datasheet STR-G6651-FL, STR-G6651 Datasheet (Allegro)

The STR-G6651 is specifically designed to satisfy the requirements
for increased integration and reliability in off-line quasi-resonant flyback
converters. This device incorporates the primary control and drive
circuit with a discrete avalanche-rated power MOSFET.

Cycle-by-cycle current limiting, under-voltage lockout with hyster­esis, over-voltage protection, and thermal shutdown protects the power
supply during the normal overload and fault conditions. Over-voltage
protection and thermal shutdown are latched after a short delay. The
latch may be reset by cycling the input supply. Low-current startup and
a low-power standby mode selected from the secondary circuit completes
a comprehensive suite of features. The device is provided in a five-pin
over-molded TO-220 style package, affording dielectric isolation without
compromising thermal characteristics. Two lead forms are available
(with and without the suffix ‘-LF’) to accommodate printed wiring board
layout or mechanical constraints.

Proven in substantial volumes, the STR-G6651 is a robust low-risk
solution for off-line power supplies particularly where management of
EMI at the source is a significant element of the system design.

FEATURES

■ Quasi-Resonant Operation

■ Output Power to 66 W

■ Low-Loss, Pulse-Ratio-Control Standby Mode

■ Temperature-Compensated Pulse-by-Pulse Over-Current Protection

■ Latched Over-Voltage and Thermal Protection

■ Under-Voltage Lockout with Hysteresis

■ Active Low-Pass Filter for Enhanced Light-Load Stability

■ Switched Attenuation of Leading-Edge Current-Sensing Signal

■ Regulated Soft Gate Drive

■ Adjustable Switching Speed for EMI Control

■ Overmolded Five-Pin Package

OFF-LINE QUASI-RESONANT

FLYBACK SWITCHING REGULATOR

Always order by complete part number: STR-G6651 .

Data Sheet

28102.9A

™

STR-G6651

ABSOLUTE MAXIMUM RATINGS

at T

A

= +25°C

Control Supply Voltage, VIN. . . . . . . 35 V

Drain-Source Voltage, VDS. . . . . . . . 650 V

Drain Current, I

D

continuous . . . . . . . . . . . . . . . . . . 2.7 A

single-pulse, tw ≤ 1 ms . . . . . . . . 7.2 A

Avalanche Energy, E

AS

single-pulse . . . . . . . . . . . . . . . 158 mJ

Over-Current Protection Voltage Range,

V

OCP

. . . . . . . . . . . . . . . -0.3 V to +6 V

Insulation RMS Voltage,

V

WM(RMS)

. . . . . . . . . . . . . . . . . . 2000 V

Package Power Dissipation, P

D

control (VIN x I

IN(ON)

) . . . . . . . . . 0.8 W

total . . . . . . . . . . . . . . . . . . . See Graph

FET Channel Temperature, TJ. . . +150°C
Internal Frame Temperature, TF. . +125°C
Operating Temperature Range,

TA. . . . . . . . . . . . . . . -20°C to +125°C

Storage Temperature Range,

TS. . . . . . . . . . . . . . . -40°C to +125°C

SOURCE

DRAIN

OVERCURRENT

& FEEDBACK

GROUND

Dwg. PK-011

VIN

1

2

3

4

5

UVLO

OVP
TSD

LATCH

OSC.

OCP

FDBK

SUPPLY

STR-G6651

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™

Copyright © 1999, 2000 Allegro MicroSystems, Inc.

FUNCTIONAL BLOCK DIAGRAM

FEEDBACK &
OVER-CURRENT
PROTECTION

GROUND

V

IN

SOURCE

DRAIN

Dwg. FK-002-5

0.73 V

–

–

TSD

OVER-VOLT.

PROTECT

R

SQ

REF.

FAULT
LATCH

4

1

2

1.45 V

UVLO

+

5

+

1.35 mA

3

DRIVE

REG.

OSC

ALLOWABLE PACKAGE POWER DISSIPATION

MAXIMUM SAFE OPERATING AREA

30

20

10

20 60 100

1.5 W

140

LIMITED BY FRAME
TEMP. = +125°C MAX.

FREE AIR

27 W

0

TEMPERATURE in °C

ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

MOUNTING SURFACE
TEMPERATURE

Dwg. GK-003-4

0.8 W

CONTROLLER

50

5

0.5

0.05

DRAIN-SOURCE VOLTAGE in VOLTS

DRAIN CURRENT in AMPERES

Dwg. GK-004-5

0.15

1.5

15

3.0

10 30 100 300

NO HEAT SINK
NATURAL COOLING
T

A

= +25°C

t

w

= 1 ms SINGLE PULSE

1000

t

w

=

0

.1

m

s S

IN

G

L

E

P

U

L

S

E

LIMITED BY V

DS

max

LIMITED
BY

r

DS(on)

STR-G6651

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATOR

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at TA = +25°C, VIN = 18 V, VDD = 10 V, VS = 0, voltage mea­surements are referenced to ground terminal (unless otherwise specified).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

On-State Voltage V

INT

Turn-on, increasing V

IN

14.4 16 17.6 V

Under-Voltage Lockout V

INQ

Turn-off, decreasing V

IN

9.0 10 11 V

Over-Voltage Threshold V

OVP(th)

Turn-off, increasing V

IN

20.5 22.5 24.5 V

Drain-Source Breakdown Voltage V

(BR)DSS

ID = 300 µA 650 – – V

Drain Leakage Current I

DSS

VDS = 650 V – – 300 µA

On-State Resistance r

DS(on)

VS = 10 V, ID = 0.9 A, TJ = +25°C– –3.95Ω

Maximum OFF Time t

off

Drain waveform high 45 – 55 µs

Minimum Pulse Duration for Input of
Quasi-Resonant Signals t

w(th)

Drain waveform high

1

––1.0µs

Minimum OFF Time t

off

Drain waveform high

1

––1.5µs

Feedback Threshold Voltage V

FDBK

Drain waveform low to high

1

0.68 0.73 0.78 V

Oscillation synchronized

2

1.3 1.45 1.6 V

Over-Current Protection/Feedback
Sink Current I

OCP/FB

V

OCP/FB

= 1.0 V 1.2 1.35 1.5 mA

Latch Holding Current I

IN(OVP)

VIN reduced from 24.5 V to 8.5 V – – 400 mA

Latch Release Voltage V

IN

IIN ≤ 20 µA, VIN reduced from 24.5 V 6.6 – 8.4 V

Switching Time t

f

VDD = 200 V, ID = 0.9 A – – 250 ns

Supply Current I

IN(ON)

Operating

3

––30mA

I

IN(OFF)

Increasing VIN prior to oscillation – – 100 µA

Insulation RMS Voltage V

WM(RMS)

All terminals simultaneous refer-

2000 – – V

ence metal plate against backside

Thermal Shutdown T

J

140 – – °C

Thermal Resistance R

θ

JM

Output junction-to-mounting frame – – 1.63 °C/W

Notes: Typical Data is for design information only.

1. Feedback is square wave, VIM = 2.2 V, th = 1 µs, tl = 35 µs

2. For quasi-resonant operation, the input signal must be longer than t

w(th)

and greater than V

FDBK

3. Feedback is square wave, VIM = 2.2 V, th = 4 µs, tl = 1 µs

STR-G6651

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™

ALLOWABLE AVALANCHE ENERGY

200

100

0 60 100

140

50

STARTING CHANNEL TEMPERATURE in °C

ALLOWABLE AVALANCHE ENERGY in mJ

Dwg. GK-009-2

150

0

20 40 80 120 160

SINGLE PULSE
DRAIN CURRENT = 1.8 A

STR-G6600 Series

Drain-Source Drain-Source

Output Breakdown Voltage ON Resistance

at ID = 300 µA at ID = 0.9 A

Part Number V

(BR)DS

, Minimum r

DS(on)

, Maximum Output Power

For 100/120 V AC Input

STR-G6622 450 V 2.18 Ω 44 W – 60 W

STR-G6624 450 V 0.92 Ω 98 W – 130 W

For 110/120 V AC Input

STR-G6632 500 V 2.62 Ω 36 W – 50 W

For 200/220 V AC Input

STR-G6651 650 V 3.95 Ω 66 W

STR-G6652 650 V 2.80 Ω 86 W

STR-G6653 650 V 1.95 Ω 120 W

STR-G6651

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATOR

www.allegromicro.com

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.

TYPICAL QUASI-RESONANT FLYBACK CONVERSION USING STR-G6651

WARNING: lethal potentials are present. See text.

Recommended mounting hardware torque:

4.34 - 5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm).

Recommended silicone grease:

Dow Corning SC102, Toshiba YG6260, Shin-Etsu G746., or equivalent

VOLTAGE

SENSE

+ OUTPUT

– OUTPUT

+

Dwg. EK-003-4A

★

0.73 V

–

–

TSD

OVER-VOLT.

PROTECT

R

SQ

REF.

FAULT
LATCH

4

1

2

1.45 V

UVLO

+

5

+

OSC

1.35 mA

3

DRIVE

REG.

FULL-BRIDGE

RECTIFIER

AC INPUT

+

STR-G6651

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™

Dimensions in Inches

(for reference only)

Dwg. MK-003-5 in

0.018

+0.008
–0.004

0.200

±0.024

AT TIPS

0.394

± 0.008

0.126

± 0.008

ø

0.665

± 0.012

0.067

± 0.004

0.110

± 0.008

0.102

± 0.004

15

0.033

+0.008
–0.004

0.165

± 0.008

0.311

± 0.008

0.343

± 0.020

0.157

± 0.008

0.161

± 0.020

0.181

REF

Dimensions in Millimeters

(controlling dimensions)

4.1

± 0.5

Dwg. MK-003-5 mm

0.45

+0.2
–0.1

5.08

±0.6

AT TIPS

10

± 0.2

3.2

± 0.2

ø

16.9

± 0.3

1.7

± 0.1

2.8

± 0.2

4.6

REF

2.6

± 0.1

15

0.85

+0.2
–0.1

4.2

± 0.2

4.0

± 0.2

7.9

± 0.2

8.7

± 0.5

STR-G6651

(LF1129)

STR-G6651

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATOR

www.allegromicro.com

Dimensions in Inches

(for reference only)

Dimensions in Millimeters

(controlling dimensions)

STR-G6651-LF

(LF1128)

0.217

± 0.020

0.224

REF

Dwg. MK-003-51 in

0.018

+0.008
–0.004

0.157

±0.020

0.394

± 0.008

0.126

± 0.008

ø

0.665

± 0.012

0.067

± 0.004

0.110

± 0.008

0.102

± 0.004

15

0.033

+0.008
–0.004

0.165

± 0.008

0.311

± 0.008

0.531

REF

0.157

± 0.008

0.291

REF

0.079

±0.020

5.5

± 0.5

5.7

REF

Dwg. MK-003-51 mm

0.45

+0.2

–0.1

4.0

±0.5

10.0

± 0.2

3.2

± 0.2

ø

16.9

± 0.3

1.7

± 0.1

2.8

± 0.2

2.6

± 0.1

15

0.85

+0.2
–0.1

4.2

± 0.2

7.9

± 0.2

13.5

REF

4.0

± 0.2

7.4

REF

2.0

±0.5

STR-G6651

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™

The products described here are manufactured in Japan by

Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.

Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc.
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 their products. Therefore, the user is
cautioned to verify that the information in this publication is
current before placing any order.

These products are not authorized for use as critical compo­nents in life-support appliances, devices, or systems without
express written approval.

The information included herein is believed to be accurate
and reliable. However, Sanken Electric Co., Ltd. and Allegro
MicroSystems, Inc. assume no responsibility for its use; nor for
any infringements of patents or other rights of third parties
which may result from its use.