DISCONTINUED PRODUCT
-- FOR REFERENCE ONL
Y
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-
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 protec-
tion, 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
s
Quasi-Resonant Ringing Choke Converter
s
Avalanche-Rated Power MOSFET Switch
s
Pulse-by-Pulse Current Limiting
s
Latched Over-Voltage and Thermal Protection
s
Maximum ON Time and OFF Time Set During Manufacture
s
Internal Under-Voltage Lockout with Hysteresis
s
Over-Molded SIP with Integral Isolated Heat Spreader
Always order by complete part number: STR-M6511 .
+
SOURCE
DRAIN
UVLO
COMMON
V IN
OVER-CURRENT
PROTECTION
Dwg. PK-002
FAULT-LATCH
TRIGGER &
SOFT START
FDBK
FAULT
LATCH
REF.
1
2
3
4
5
6
7
OSC.
R
S
FAULT
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
IN
........................... 35 V
Drain-Source Voltage, V
DS
.............. 450 V
Continuous Drain Current, I
D
............. 11 A
1 ms Single-Pulse Drain Current,
I
DM
................................................. 40 A
Single-Pulse Avalanche Energy,
E
A
.............................................. 400 mJ
Soft-Start/Fault-Latch Trigger Voltage,
V
SS/FL
............................................. 10 V
Feedback Input Current, I
FDBK
........ 20 mA
Over-Current Protection Voltage,
V
OCP
............................................. 3.5 V
Insulation Voltage,V
WM(RMS)
........... 2000 V
Package Power Diss., P
D
........ See Graph
FET Junction Temperature, T
J
...... +150
C
Internal Frame Temperature, T
F
... +125
C
Operating Temperature Range,
T
A
............................... -20
C to +125
C
Storage Temperature Range,
T
stg
............................. -40
C to +125
C
Data Sheet
28102
STR-M6511
TM
STR-M6511
OFF-LINE
SWITCHING REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
Rtoff
OSC.
TSD
OVER-VOLT.
PROTECT
COMMON
3
R
S
Q
V
IN
FDBK
OVER-CURRENT
PROTECTION
SOURCE
DRAIN
Rton
REF.
FAULT
LATCH
5
1
2
4
6
Dwg. FK-002
TRIGGER
0.01
F
3.3 k
1 k
6.8 k
FAULT-LATCH
TRIGGER
& SOFT
START
7
0.75 V
+
UVLO
1000 pF
60
40
20
20
60
100
2.8 W
140
LIMITED BY FRAME
TEMP. = +125
C MAX.
RECOMMENDED MAX.
FRAME TEMP. = +100
C
FREE AIR
54 W
0
TEMPERATURE in
C
ALLOWABLE PACKAGE POWER DISSIPATION in WATTS
MOUNTING SURFACE
TEMPERATURE
Dwg. GK-003-1
LIMITED
BY r
DS(on)
100
10
1.0
0.1
DRAIN-TO-SOURCE VOLTAGE in VOLTS
DRAIN CURRENT in AMPERES
Dwg. GK-004-2
0.3
3.0
30
3.0
10
30
100
300
LIMITED BY V max
DS
NO HEAT SINK
NATURAL COOLING
T = +25
C
A
t = 10 ms SINGLE PULSE
w
t = 1 ms SINGLE PULSE
w
t = 0.1 ms SINGLE PULSE
w
FUNCTIONAL BLOCK DIAGRAM
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
Copyright 1994 Allegro MicroSystems, Inc.
ALLOWABLE AVALANCHE ENERGY
ELECTRICAL CHARACTERISTICS
at T
A
= +25
C, V
IN
= 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
INT
Turn-on, increasing V
IN
14.4
17.6
V
Under-Voltage Lockout
V
INQ
Turn-off, decreasing V
IN
9.0
11
V
Over-Voltage Threshold
V
OVP(th)
26
31
V
FET Leakage Current
I
DSS
V
DS
= 450 V
300
A
FET ON Resistance
r
DS(on)
V
GS
= 10 V, I
D
= 5 A
0.45
0.55
Output Fall Time
t
f
V
DD
= 200 V, I
D
= 5 A, 10% to 90% V
DS
250
ns
Maximum ON Time
t
on
18
22
s
Minimum OFF Time
t
off
0.6
1.6
s
Over-Current Threshold
V
OCP(th)
700
800
mV
Feedback Threshold Volt.
V
FDBK(th)
750
mV
Soft-Start Current
I
SS
V
SS
= 0 V
-2.2
-3.4
mA
Fault-Latch Threshold Volt.
V
FL(th)
6.9
7.7
V
Fault-Latch Holding Current
I
INH
V
IN
reduced from 31 V to 8.5 V
340
400
A
Fault-Latch Reset Voltage
V
INQ
I
IN
<20
A, V
IN
reduced from 31 V
6.5
8.5
V
Insulation RMS Voltage
V
WM(RMS)
All terminals simultaneous reference
2000
V
metal plate against backside
Supply Current
I
IN(ON)
Operating
18
28
mA
I
IN(OFF)
Start up, V
IN
14 V
100
A
Thermal Shutdown
T
J
125
150
C
Thermal Resistance
R
JM
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.
600
400
200
0
60
100
140
100
STARTING CHANNEL TEMPERATURE in
C
ALLOWABLE AVALANCHE ENERGY in mJ
Dwg. GK-009-1
300
500
0
20
40
80
120
160
SINGLE PULSE
DRAIN CURRENT = 5 A
SUPPLY VOLTAGE = 50 V
STR-M6511
OFF-LINE
SWITCHING REGULATOR
STR-M6511
OFF-LINE
SWITCHING REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
+
VOLTAGE
SENSE
FULL-BRIDGE
RECTIFIER
AC INPUT
100 V/120 V
+ OUTPUT
OUTPUT
+
+
+
Dwg. EK-002
3
R
S
Q
5
1
2
4
6
7
+
5
STR-M6511
5
TYPICAL APPLICATION
WARNING: lethal potentials are present. See text.
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 IRFP448. 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 lbfft (6 8 kgcm or 0.588 0.784 Nm).
Recommended metal-oxide-filled, alkyl-degenerated oil base, silicone grease:
Dow Corning 340, or equivalent
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