Page 1
Data Sheet
STR-M6511
28102
OFF-LINE SWITCHING REGULATOR
– WITH POWER MOSFET OUTPUT
The STR-M6511 is specifically designed to meet the requirement for
increased integration and reliability in off-line flyback converters operat-
1
DRAIN
FAULT
OSC.
SOURCE
COMMON
OVER-CURRENT
PROTECTION
V
FDBK
FAULT-LATCH
TRIGGER &
SOFT START
2
3
4
5
IN
6
7
+
LATCH
RS
FAULT
UVLO
REF.
Dwg. PK-002
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VIN........................... 35 V
Drain-Source Voltage, VDS.............. 450 V
Continuous Drain Current, ID............. 11 A
1 ms Single-Pulse Drain Current,
IDM................................................. 40 A
Single-Pulse Avalanche Energy,
EA.............................................. 400 mJ
Soft-Start/Fault-Latch Trigger Voltage,
V
............................................. 10 V
SS/FL
Feedback Input Current, I
Over-Current Protection Voltage,
V
............................................. 3.5 V
OCP
Insulation Voltage,V
WM(RMS)
Package Power Diss., PD........ See Graph
DISCONTINUED PRODUCT
FET Junction Temperature, TJ...... +150°C
Internal Frame Temperature, TF... +125°C
— FOR REFERENCE ONLY
Operating Temperature Range,
TA............................... -20°C to +125°C
Storage Temperature Range,
T
............................. -40°C to +125°C
stg
........ 20 mA
FDBK
........... 2000 V
ing in the quasi-resonant ringing choke mode. The device incorporates
the primary control and drive circuit with a discrete avalanche-rated
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
devices during all normal and overload conditions. Over-voltage protection, thermal shutdown, or an external fault signal are latched. The dual
requirements of dielectric isolation and low transient thermal impedance
and steady-state thermal resistance are satisfied in an over-molded
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. A similar off-line switching regulator, with an
output rating of 800 V at 10 A, is also available.
FEATURES
■ Quasi-Resonant Ringing Choke Converter
■ 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
Always order by complete part number: STR-M6511 .
™
Page 2
STR-M6511
OFF-LINE
SWITCHING REGULATOR
FUNCTIONAL BLOCK DIAGRAM
V
IN
5
UVLO
REF.
OVER-VOLT.
PROTECT
R
FAULT
LATCH
SQ
1
2
DRAIN
SOURCE
TSD
TRIGGER
OSC.
R
R
ton
6
FDBK
toff
+
0.75 V
1000 pF
0.01 µF
OVER-CURRENT
4
PROTECTION
COMMON3
Dwg. FK-002
FAULT-LATCH
TRIGGER
& SOFT
START
3.3 kΩ
7
1 kΩ
6.8 kΩ
ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA
60
54 W
40
MOUNTING SURFACE
TEMPERATURE
RECOMMENDED MAX.
FRAME TEMP. = +100°C
100
t = 0.1 ms SINGLE PULSE
w
30
LIMITED
BY r
DS(on)
10
t = 1 ms SINGLE PULSE
w
t = 10 ms SINGLE PULSE
w
20
FREE AIR
2.8 W
ALLOWABLE PACKAGE POWER DISSIPATION in WATTS
0
20 60 100
TEMPERATURE in °C
LIMITED BY FRAME
TEMP. = +125°C MAX.
140
Dwg. GK-003-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1994 Allegro MicroSystems, Inc.
3.0
1.0
DRAIN CURRENT in AMPERES
0.3
0.1
3.0
NO HEAT SINK
NATURAL COOLING
T = +25°C
A
10 30 100 300
DRAIN-TO-SOURCE VOLTAGE in VOLTS
DS
LIMITED BY V max
Dwg. GK-004-2
™
Page 3
STR-M6511
OFF-LINE
SWITCHING REGULATOR
ALLOWABLE AVALANCHE ENERGY
600
500
SINGLE PULSE
400
300
200
100
ALLOWABLE AVALANCHE ENERGY in mJ
0
20 40 80 120 160
0 60 100
STARTING CHANNEL TEMPERATURE in °C
DRAIN CURRENT = 5 A
SUPPLY VOLTAGE = 50 V
140
Dwg. GK-009-1
ELECTRICAL CHARACTERISTICS
at TA = +25°C, VIN = 18 V, voltage measurements are referenced to
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 Volt. V
OCP(th)
FDBK(th)
Soft-Start Current I
Fault-Latch Threshold Volt. 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 = 450 V – – 300 µA
VGS = 10 V, ID = 5 A – 0.45 0.55 Ω
VDD = 200 V, ID = 5 A, 10% to 90% V
DS
– – 250 ns
18 – 22 µs
0.6 – 1.6 µs
700 – 800 mV
– 750 – mV
VSS = 0 V -2.2 – -3.4 mA
6.9 – 7.7 V
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
Thermal Shutdown T
Thermal Resistance R
IN(ON)
I
IN(OFF)
θJM
J
NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.
Typical Data is for design information only.
Operating 18 – 28 mA
Start up, VIN ≤14 V – – 100 µA
125 150 – °C
FET junction to mounting surface – 2.0 – °C/W
Page 4
STR-M6511
OFF-LINE
SWITCHING REGULATOR
WARNING: lethal potentials are present. See text.
5
5
+
AC INPUT
100 V/120 V
RECTIFIER
FULL-BRIDGE
TYPICAL APPLICATION
STR-M6511
R
SQ
+ OUTPUT
1
2
+
+
VOLTAGE
SENSE
7
– OUTPUT
★
+
6
4
+
3
Dwg. EK-002
APPLICATIONS INFORMATION
WARNING —
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 IRFP448. These devices
feature an excellent combination of fast switching, ruggedized device design, low on-resistance, and cost effectiveness.
These devices are designed to be operated at lethal voltages and energy levels.
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
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
Page 5
STR-M6511
OFF-LINE
SWITCHING REGULATOR
0.780
0.157
±0.008
Dimensions in Inches
(for reference only)
±0.008
T REF
M
0.130
ø
±0.008
0.216
±0.008
±0.012
0.906
0.033
+0.008
–0.004
±0.008
0.689
0.276
±0.02
1
7
0.100
±0.004
0.177
±0.028
Dwg. MK-003-7 in
0.128
±0.004
0.216
0.026
+0.008
–0.004
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
Page 6
STR-M6511
OFF-LINE
SWITCHING REGULATOR
Dimensions in Millimeters
(controlling dimensions)
19.8
±0.2
T REF.
M
3.3
4.0
±0.2
±0.2
ø
5.5
±0.2
±0.3
23.0
0.85
+0.2
–0.1
±0.2
17.5
3.25
±0.1
7.0
±0.5
5.5
1
7
2.54
±0.1
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
0.65
+0.2
–0.1
4.5
±0.7
Dwg. MK-003-7 mm
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 design of their products.
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
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