STR-M6511.PDF
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S6511
STR-M6511
OFF-LINE SWITCHING REGULATOR
STR-M6511
OFF-LINE SWITCHING REGULATOR
– WITH POWER MOSFET OUTPUT
DRAIN
1
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.
SOURCE
2
OSC.
FAULT
LATCH
R
S
COMMON
3
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.
OVER-CURRENT
PROTECTION
4
FAULT
V
IN
5
UVLO
FDBK
6
REF.
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.
FAULT-LATCH
TRIGGER &
SOFT START
7
Dwg. PK-002
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
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
n
Quasi-Resonant Ringing Choke Converter
n
Avalanche-Rated Power MOSFET Switch
n
Pulse-by-Pulse Current Limiting
n
Latched Over-Voltage and Thermal Protection
n
Maximum ON Time and OFF Time Set During Manufacture
°
C
n
Internal Under-Voltage Lockout with Hysteresis
Internal Frame Temperature, T
F
...
+125
°
C
n
Over-Molded SIP with Integral Isolated Heat Spreader
Operating Temperature Range,
T
A
...............................
-20
°
C to +125
°
C
Storage Temperature Range,
T
stg
°
C to +125
°
C
Always order by complete part number:
STR-M6511
.
A
TM
MicroSystems, Inc.
.............................
-40
TM
STR-M6511
OFF-LINE SWITCHING REGULATOR
FUNCTIONAL BLOCK DIAGRAM
V
IN
5
R
1
DRAIN
UVLO
OVER-VOLT.
PROTECT
FAULT
LATCH
2
SOURCE
S
Q
REF.
TSD
OSC.
FAULT-LATCH
TRIGGER
& SOFT
START
7
TRIGGER
R
toff
R
ton
OVER-CURRENT
PROTECTION
+
4
0.75 V
1000 pF
3
COMMON
0.01
m
F
6
FDBK
Dwg. FK-002
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
60
100
MOUNTING SURFACE
TEMPERATURE
54 W
30
LIMITED
BY r
DS(on)
40
RECOMMENDED MAX.
FRAME TEMP. = +100
°
C
10
3.0
LIMITED BY FRAME
TEMP. = +125
°
C MAX.
20
1.0
NO HEAT SINK
NATURAL COOLING
T = +25
A
C
FREE AIR
0.3
2.8 W
0
0.1
20
60
100
140
3.0
10
30
100
300
TEMPERATURE in
°
C
DRAIN-TO-SOURCE VOLTAGE in VOLTS
Dwg. GK-003-1
Dwg. GK-004-2
A
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1994 Allegro MicroSystems, Inc.
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
°
TM
STR-M6511
OFF-LINE SWITCHING REGULATOR
600
500
ALLOWABLE AVALANCHE ENERGY
400
SINGLE PULSE
DRAIN CURRENT = 5 A
SUPPLY VOLTAGE = 50 V
300
200
100
0
0
20
40
60
80
100
120
140
160
STARTING CHANNEL TEMPERATURE in
°
C
Dwg. GK-009-1
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
m
A
FET ON Resistance
r
DS(on)
V
GS
= 10 V, I
D
= 5 A
–
0.45 0.55
W
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
m
s
Minimum OFF Time
t
off
0.6
–
1.6
m
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
m
A
Fault-Latch Reset Voltage
V
INQ
I
IN
<20
m
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
m
A
Thermal Shutdown
T
J
125 150
–
°
C
Thermal Resistance
R
q
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.
STR-M6511
OFF-LINE SWITCHING REGULATOR
TYPICAL APPLICATION
WARNING:
lethal potentials are present. See text.
+ OUTPUT
5
STR-M6511
R
1
+
+
2
S
Q
VOLTAGE
SENSE
+
7
– OUTPUT
H
+
4
3
+
6
Dwg. EK-002
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 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
A
TM
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5
TM
STR-M6511
OFF-LINE SWITCHING REGULATOR
Dimensions in Inches
(Based on 1 mm = 0.03937")
0.780
±
0.008
T REF
M
0.157
±
0.130
±
0.008
ø
0.216
±
0.008
0.128
±
0.004
0.276
±
0.02
0.216
1
7
0.100
±
0.004
0.033
+0.008
–0.004
0.026
+0.008
–
0.004
0.177
±
0.028
Dwg. MK-003-7 in
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
0.008
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