STR-M6511
OFF-LINE SWITCHING REGULATOR
STR-M6511
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
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
............................. -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 .
Data Sheet
28102
A
TM
TM
MicroSystems, Inc.
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
A
TEMPERATURE in °C
MicroSystems, Inc.
LIMITED BY FRAME
TEMP. = +125°C MAX.
TM
TM
3.0
1.0
140
Dwg. GK-003-1
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
115 Northeast Cutoff, Box 15036
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1994 Allegro MicroSystems, Inc.
DS
LIMITED BY V max
Dwg. GK-004-2
STR-M6511
OFF-LINE SWITCHING REGULATOR
600
500
400
ALLOWABLE AVALANCHE ENERGY
300
200
100
ALLOWABLE AVALANCHE ENERGY in mJ
SINGLE PULSE
DRAIN CURRENT = 5 A
SUPPLY VOLTAGE = 50 V
0
20 40 80 120 160
0 60 100
STARTING CHANNEL TEMPERATURE in °C
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
STR-M6511
OFF-LINE SWITCHING REGULATOR
TYPICAL APPLICATION
WARNING: lethal potentials are present. See text.
5
AC INPUT
100 V/120 V
RECTIFIER
FULL-BRIDGE
5
+
R
SQ
STR-M6511
1
2
+ OUTPUT
+
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
TM
TM
A
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
STR-M6511
OFF-LINE SWITCHING REGULATOR
Dimensions in Inches
(Based on 1 mm = 0.03937")
0.780
±0.008
T REF
M
0.130
0.157
±0.008
±0.008
ø
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.
STR-M6511
OFF-LINE SWITCHING REGULATOR
Dimensions in Millimeters
19.8
±0.2
T REF.
M
4.0
±0.2
3.3
±0.2
ø
5.5
±0.2
±0.3
23.0
0.85
+0.2
–0.1
±0.2
17.5
7.0
±0.5
1
7
2.54
±0.1
0.65
+0.2
–0.1
Dwg. MK-003-7 mm
3.25
±0.1
5.5
4.5
±0.7
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.
TM
TM
A
MicroSystems, Inc.
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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