Allegro s6525 Service Manual

STR-S6525

INTERIM DATA SHEET

OFF-LINE SWITCHING REGULATOR

(Subject to change without notice)
August 18, 1994

STR-S6525

OFF-LINE SWITCHING REGULATOR

– WITH POWER MOSFET OUTPUT

The STR-S6525 is specifically designed to meet the requirement

for increased integration and reliability in off-line flyback converters

DRAIN

1

FAULT

OSC.

SOURCE

COMMON

SYNC

V

FDBK

SOFT START

FAULT-LATCH

TRIGGER

OVER-CURRENT

PROTECTION

2

3

4

5

IN

6

7

8

9

+

LATCH

RS

FAULT

UVLO

REF.

Dwg. PK-002-1

ABSOLUTE MAXIMUM RATINGS

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

Drain-Source Voltage, VDS.............. 600 V

Continuous Drain Current, ID............ 6.0 A

1 ms Single-Pulse Drain Current,

IDM................................................. 24 A

Single-Pulse Avalanche Energy,

EA.............................................. 400 mJ

Feedback Input Current, I
Fault-Latch Trig. Input Current, IFL 1.0 mA

dc ≤ 25%, I

........................... -50 mA

FLM

Soft-Start Output Current, ISS....... -3.0 mA

Over-Current Protection Voltage,

V

............................................. 3.5 V

OCP

Insulation Voltage,V

NOT FOR NEW DESIGN

WM(RMS)

Package Power Diss., PD........ See Graph

FET Junction Temperature, TJ...... +150°C

Internal Frame Temperature, TF... +125°C
Operating Temperature Range,

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

Storage Temperature Range,

T

............................. -30°C to +125°C

stg

........ 20 mA

FDBK

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

operating in a constant OFF-time mode. The device incorporates the
primary control and drive circuit with a discrete avalanche-rated high­voltage power MOSFET.

Crucial system parameters such as maximum ON time and OFF
time are fixed during manufacture. Local control circuit decoupling and
layout are optimized within the device.

Cycle-by-cycle current limiting, soft start, under-voltage lock-out
with hysteresis, over-voltage protection, and thermal shutdown protect
the device during all normal and overload conditions. Over-voltage
protection, thermal shutdown, or an external fault signal be latched.
The dual requirements of dielectric isolation and low transient thermal
impedance and steady-state thermal resistance are satisfied in an over­molded single-in-line power package.

Proven in substantial volumes, this device and its fixed-frequency
counterparts represents a significant advance in off-line SMPS reliability
growth and integration.

FEATURES

■ Constant OFF-Time Converter Operating Mode

■ Avalanche-Rated Power MOSFET Switch

■ Pulse-by-Pulse Current Limiting

■ Latched Over-Voltage and Thermal Protection

■ Maximum ON Time and OFF Time Set During Manufacture

■ Internal Under-Voltage Lockout with Hysteresis

■ Over-Molded SIP with Integral Isolated Heat Spreader

■ External Synchronization Capability

Always order by complete part number: STR-S6525 .

Data Sheet

28102.11

STR-S6525

4

3

512

9

6

7

8

OFF-LINE SWITCHING REGULATOR

FUNCTIONAL BLOCK DIAGRAM

V

IN

DRAIN

SOURCE

SOFT

START

2 kΩ

UVLO

REF.

OVER-VOLT.

PROTECT

R

FAULT

LATCH

SQ

TSD

OSC.

TRIGGER

0.01 µF
R

toff

OVER-CURRENT

+

PROTECTION

0.75 V
1000 pF

COMMON

Dwg. FK-002-1

FAULT-LATCH

TRIGGER

1 kΩ

R

ton

0.01 µF

20 kΩ

FDBK

SYNC

ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA

60

54 W

40

20

3.2 W

ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

0

20 60 100

MOUNTING SURFACE
TEMPERATURE

FREE AIR

RECOMMENDED MAX.
FRAME TEMP. = +100°C

TEMPERATURE in °C

LIMITED BY FRAME
TEMP. = +125°C MAX.

140

Dwg. GK-003-2

100

30

10

3.0

1.0

DRAIN CURRENT in AMPERES

0.3

0.1

3.0

LIMITED
BY r

DS(on)

NO HEAT SINK
NATURAL COOLING
T = +25°C

A

10 30 100 300

t = 0.1 ms SINGLE PULSE

w

t = 1 ms SINGLE PULSE

w

INFINITE HEAT SINK

DRAIN-TO-SOURCE VOLTAGE in VOLTS

DS

LIMITED BY V max

1000

Dwg. GK-004-4

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

W
Copyright © 1994 Allegro MicroSystems, Inc.

STR-S6525

OFF-LINE SWITCHING REGULATOR

600

500

ALLOWABLE AVALANCHE ENERGY

400

300

200

100

ALLOWABLE AVALANCHE ENERGY in mJ

0

SINGLE PULSE
DRAIN CURRENT = 5 A
SUPPLY VOLTAGE = 50 V

20 40 80 120 160

0 60 100

STARTING CHANNEL TEMPERATURE in °C

140

Dwg. GK-009-1

ELECTRICAL CHARACTERISTICS at T

= +25°C, VIN = 18 V, voltage measurements are referenced to

A

Common (pin 3) (unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

On-State Voltage V
Under-Voltage Lockout V
Over-Voltage Threshold V

OVP(th)

FET Leakage Current I
FET ON Resistance r

DS(on)

Output Fall Time t
Maximum ON Time t
Minimum OFF Time t
Over-Current Threshold V
Feedback Threshold V

OCP(th)

FDBK(th)

Soft-Start Voltage V
Sync. Trigger Threshold Volt. V

SYNC(th)

Fault-Latch Trig. Threshold V
Fault-Latch Holding Current I
Fault-Latch Reset Voltage V
Insulation RMS Voltage V

WM(RMS)

INT
INQ

DSS

f
on
off

SS

FL(th)

INH

INQ

Turn-on, increasing V
Turn-off, decreasing V

IN

IN

14.4 – 17.6 V

9.0 – 11 V
26 – 31 V

VDS = 600 V – – 300 µA
VGS = 10 V, ID = 3 A – 1.0 1.25 Ω
VDD = 200 V, ID = 5 A, 10% to 90% V
I

= 0 27 – 33 µs

FDBK

DS

– – 250 ns

50 – 62 µs

700 – 800 mV

– 750 – mV

8.7 – 9.7 V

– 3.0 – V

680 – 880 mV
VIN reduced from 31 V to 8.5 V – 340 400 µA
IIN ≤ 20 µA, VIN reduced from 31 V 6.5 – 8.5 V
All terminals simultaneous reference 2000 – – V

metal plate against backside

Supply Current I

IN(ON)

I

IN(OFF)

Thermal Shutdown T
Thermal Resistance R

J

θJM

Operating 9.0 – 15 mA
Start up, VIN =14 V – – 200 µA

125 150 – °C
FET junction to mounting surface – 2.0 – °C/W

NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.

Typical Data is for design information only.

STR-S6525

OFF-LINE SWITCHING REGULATOR

TYPICAL CHARACTERISTICS

50

40

30

ON TIME in µs

20

10

0

0 0.6 1.0

0.2 0.4 0.8

FEEDBACK CURRENT in mA

Dwg. GK-019

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

STR-S6525

OFF-LINE SWITCHING REGULATOR

TYPICAL APPLICATION

WARNING: lethal potentials are present. See text.

5

AC INPUT

RECTIFIER

FULL-BRIDGE

5

R

7

+

SQ

STR-S6525

+ OUTPUT

1

2

+

+

VOLTAGE

SENSE

– OUTPUT

★

8

+

6

4

150 Ω

TURN ON

9

3

TO PIN 6

TO PIN 8

Dwg. EK-001

APPLICATIONS INFORMATION

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.

The power MOSFET outputs of these devices are similar to the International Rectifier type IRFBC40. These devices
feature an excellent combination of fast switching, ruggedized device design, low on-resistance, and cost effectiveness.

Recommended mounting hardware torque:

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

Recommended metal-oxide-filled, alkyl-degenerated oil base, silicone grease:

Dow Corning 340, or equivalent

STR-S6525

OFF-LINE SWITCHING REGULATOR

Dimensions in Inches

(Based on 1 mm = 0.03937")

0.953

±0.008

T REF.

0.610

±0.008

0.118

M

0.130

±0.008

ø

0.216

±0.008

±0.012

1.49

0.033

+0.008
–0.004

1

0.016

PACKAGE

CENTER

9

LEAD
CENTER

0.100

±0.004

±0.008

0.709

0.177

±0.028

0.130

±0.004

0.276

±0.016

0.216

0.026

+0.008
–0.004

Dwg. MK-003-9 in

NOTE: Exact body and lead configuration at vendor’s option within limits shown.

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

STR-S6525

OFF-LINE SWITCHING REGULATOR

Dimensions in Millimeters

24.2

±0.2

T REF

15.5

3.0

±0.2

3.3

±0.2

M

ø

5.5

±0.2

±0.3

23.0

0.85

+0.2
–0.1

1

0.4

PACKAGE

CENTER

9

LEAD
CENTER

2.54

±0.1

±0.2

18.0

0.65

+0.2
–0.1

3.3

±0.1

7.0

±0.4

5.5

4.5

±0.7

Dwg. MK-003-9 mm

NOTE: Exact body and lead configuration at vendor’s option within limits shown.

STR-S6525

OFF-LINE SWITCHING REGULATOR

POWER CONVERSION/POWER MANAGEMENT

SELECTION GUIDES

SWITCHING REGULATOR PMCMs

Part

Number* Application AC In Max P

5703 Quasi-Resonant Flyback Converter 110/120 V 140 W 500 V 6 A Bipolar
5707 Quasi-Resonant Flyback Convertter 85-265 V 90 W 850 V 6 A Bipolar

220/240V 140 W

5708 Quasi-Resonant Flyback Converter 85-265 V 120 W 850 V 7.5 A Bipolar

220/240 V 180 W
6511 Quasi-Resonant Flyback Converter 110/120 V 180 W 450 V 11 A MOSFET
6703 Quasi-Resonant Flyback Converter 110/120V 140 W 500 V 6 A Bipolar

O

Power Switch

6704 Quasi-Resonant Flyback Converter 110/120 V 100 W 500 V 5 A Bipolar
6707 Quasi-Resonant Flyback converter 85-265 V 90 W 850 V 6 A Bipolar

220/240 V 140 W
6708 Quasi-Resonant Flyback Converter 85-265 V 120 W 850 V 7.5 A Bipolar

220/240 V 180 W
6709 Quasi-Resonant Flyback Converter 85-265 V 160 W 850 W 10 A Bipolar

220/240 V 220 W

* Complete part number includes additional characters to indicate operating temperature range and package style.

LINEAR REGULATOR ICs

Part

Number* V

8184 3.0 V 10 V 300 mV @ 125 mA 250 mA SOT-89
8187 3.3 V 10 V 300 mV @ 125 mA 250 mA SOT-89
8188 2.5–3.3 V 10 V 300 mV @ 125 mA 250 mA SOT-89
8188 2.5–3.3 V 10 V 300 mV @ 125 mA 250 mA SOIC

* Complete part number includes additional characters to indicate operating temperature range and package style.
Also — 83145 and 84145 Latched, Universal Input-Voltage Switches.

O

Max DC In Max Dropout Max I

O

Package

Allegro MicroSystems, Inc. reserves the right to make, from
time to time, such departures from the detail specifications as
may be required to permit improvements in the design of its
products. Components made under military approvals will be in
accordance with the approval requirements.

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

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