Allegro STRS6529 Datasheet
DRAIN
SOURCE
COMMON
OVER-CURRENT
PROTECTION
V
Data Sheet
28102.1
STR-M6529
OFF-LINE SWITCHING REGULATOR
– WITH POWER MOSFET OUTPUT
The STR-M6529 is specifically designed to meet the requirement
for increased integration and reliability in off-line flyback converters
1
FAULT
OSC.
2
3
4
5
IN
+
LATCH
RS
FAULT
UVLO
operating in the quasi-resonant ringing choke mode. The device
incorporates the primary control and drive circuit with a discrete avalanche-rated high-voltage 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.
FDBK
FAULT-LATCH
TRIGGER &
SOFT START
6
7
REF.
Dwg. PK-002
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 overmolded single-in-line power package.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VIN........................... 35 V
Proven in substantial volumes, this device and its fixed-frequency
counterparts represents a significant advance in off-line SMPS reliability
growth and integration.
Drain-Source Voltage, VDS.............. 800 V
Continuous Drain Current, ID............ 5.4 A
1 ms Single-Pulse Drain Current,
IDM................................................. 20 A
Single-Pulse Avalanche Energy,
EA.............................................. 400 mJ
Soft-Start/Fault-Latch Trig. Voltage,
V
............................................. 12 V
SS/FL
Feedback Input Current, I
........ 20 mA
FDBK
Over-Current Protection Voltage,
V
............................................. 3.5 V
OCP
Insulation Voltage,V
DISCONTINUED PRODUCT
WM(RMS)
........... 2000 V
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
Package Power Diss., PD........ See Graph
FET Junction Temperature, TJ...... +150°C
— FOR REFERENCE ONLY
Internal Frame Temperature, TF... +125°C
■ Internal Under-Voltage Lockout with Hysteresis
■ Over-Molded SIP with Integral Isolated Heat Spreader
Operating Temperature Range,
TA............................... -20°C to +125°C
Storage Temperature Range,
T
............................. -40°C to +125°C
stg
Always order by complete part number: STR-M6529 .
™
STR-M6529
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
0.01 µF
toff
OVER-CURRENT
+
0.75 V
1000 pF
4
PROTECTION
COMMON3
Dwg. FK-002-2
R
ton
6
FDBK
FAULT-LATCH
TRIGGER
& SOFT
START
3.3 kΩ
7
3.3 kΩ
ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA
60
54 W
40
MOUNTING SURFACE
TEMPERATURE
RECOMMENDED MAX.
FRAME TEMP. = +100°C
100
30
10
LIMITED
BY r
DS(on)
t = 1 ms SINGLE PULSE
w
t = 10 ms SINGLE PULSE
w
t = 0.1 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
1000
Dwg. GK-004-1
™
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