Allegro s6511 Service Manual
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
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