STR-S6401, ukł scalone S
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STR-S6401
AND
OFF-LINE SWITCHING REGULATORS
– WITH POWER MOSFET OUTPUT
DRAIN
1
These devices are specifically designed to meet the requirements
for increased integration and reliability in off-line flyback (STR-S6401)
and forward (STR-S6401F) converters operating in a fixed-frequency
PWM mode. Each device incorporates the primary control and drive
circuits with an avalanche-rated power MOSFET. Crucial system
parameters such as switching frequency and maximum duty cycle are
fixed during manufacture. The STR-S6401 and STR-S6401F differ only
in their maximum duty cycle. Control circuit decoupling and layout are
optimized within each device.
SOURCE
2
LATCH
OSC.
GATE
3
PWM
POWER
GROUND
4
SOFT
START
5
Cycle-by-cycle and average-current limiting, soft start, under-
voltage lockout with hysteresis, and thermal shutdown protect the
device during all normal and overload conditions. The performance and
reliability of these devices, and their variable-frequency counterparts,
has been proven in substantial volume production.
OVER-CURRENT
PROTECTION
6
V
IN
7
UVLO
REF.
SIGNAL
GROUND
8
FDBK
9
The requirements of high dielectric isolation and low transient
thermal impedance and steady-state thermal resistance are satisfied in
an over-molded, 9-pin single in-line power package. Similar off-line
switching regulators, with output ratings to 800 V at 5 A, are also
available.
Dwg. PK-003
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
IN
............................
35 V
Drain-Source Voltage, V
DS
...............
500 V
Drain Current, I
D
continuous ...................................
FEATURES
±
10 A
n
PWM Flyback Conversion or Forward Conversion
single pulse, t
w
£
1 ms ..................
±
40 A
Avalanche Energy, E
A
single pulse ...............................
500 mJ
Gate-Source Voltage, V
GS
................
n
Output Power to 250 W
±
n
Pulse-by-Pulse Current Limiting
20 V
n
Fixed-Frequency 100 kHz PWM
Gate-Drive Current Range,
I
G
.................................
-0.7 A to +1.5 A
Over-Current Protection Voltage Range,
V
OCP
.............................
-0.3 V to +4.0 V
Insulation RMS Voltage,
V
WM(RMS)
.....................................
2000 V
Package Power Dissipation,
P
D
........................................
See Graph
FET Channel Temperature, T
J
......
+150
n
Avalanche-Rated Power MOSFET Switch
n
Soft Start
n
Internal Under-Voltage Lockout and Thermal Shutdown
n
Low External Component Count
n
Over-Molded SIP with Isolated Heat Spreader
°
C
Internal Frame Temperature, T
F
...
+125
°
C
Operating Temperature Range,
T
A
...............................
-20
°
C to +125
°
C
Always order by complete part number:
Storage Temperature Range,
T
stg
.............................
-30
°
C to +125
°
C
STR-S6401
or
STR-S6401F
.
â„¢
STR-S6401F
 STR-S6401
AND
STR-S6401F
OFF-LINE
SWITCHING REGULATORS
FUNCTIONAL BLOCK DIAGRAM
V
IN
FDBK
GATE
7
9
3
UVLO
REF.
1
DRAIN
R
ton
PWM
R
Q
+
LATCH
R
toff
S
OSC.
2
SOURCE
+
6
OVER-CURRENT
PROTECTION
0.2 V
5
8
4
SOFT
START
SIGNAL
GROUND
POWER
GROUND
Dwg. FK-003
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
62 W
MOUNTING SURFACE
TEMPERATURE
60
100
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
°
C
A
FREE AIR
0.3
3.2 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
Dwg. GK-004
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
â„¢
W
Copyright © 1994, Allegro MicroSystems, Inc.
°
 STR-S6401
AND
STR-S6401F
OFF-LINE
SWITCHING REGULATORS
600
500
ALLOWABLE AVALANCHE ENERGY
400
SINGLE PULSE
DRAIN CURRENT = 10 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
ELECTRICAL CHARACTERISTICS
at T
A
= +25
°
C, V
IN
= 17 V, voltage measurements are referenced to
Signal Ground (pin 8) (unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
On-State Voltage
V
INT
Turn-on, increasing V
IN
14.4 16 17.6
V
Under-Voltage Lockout
V
INQ
Turn-off, decreasing V
IN
8.4 9.4 10.4
V
FET Leakage Current
I
DSS
V
DS
= 400 V
–
–
300
m
A
FET ON Resistance
r
DS(on)
V
GS
= 10 V, I
D
= 5 A
–
0.5 0.6
W
Forward Transconductance
g
fs
V
GS
= 10 V, I
D
= 5 A
–
9.2
–
S
FET Input Capacitance
C
iss
V
DS
=10 V, V
GS
=0 V, f=1 MHz
– 1800 –
pF
Propagation Delay Time
t
phl
Turn-on, 10% V
GS
to 10% V
DS
–0– s
t
plh
Turn-off, 90% V
GS
to 90% V
DS
–
140
–
ns
Oscillator Frequency
f
osc
93 100 107
kHz
Maximum ON Time
t
on
STR-S6401
5.1 5.7 6.5
m
s
STR-S6401F
3.8 4.5 5.2
m
s
Over-Current Threshold
V
OCP(th)
160 200 240
mV
OCP Current
I
OCP
-250 -400 -550
m
A
Feedback Current
I
FDBK
–
-1.8
–
mA
Soft Start Threshold Voltage
V
SS(th)
–
–
0.4
V
Soft Start Current
I
SS
V
SS
= 0 V
–
-100
–
m
A
Power Ground Current
I
PG
t
w
= 200 ns
–
-1.0 -1.5
A
Supply Current
I
IN(ON)
Operating
–
23
–
mA
I
IN(OFF)
Start up, V
IN
= 12 V
–
–
500
m
A
Insulation RMS Voltage
V
WM(RMS)
All terminals simultaneous reference
2000 –
–
V
metal plate against backside
Thermal Resistance
R
q
JM
FET channel 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-S6401
AND
STR-S6401F
OFF-LINE
SWITCHING REGULATORS
TYPICAL CHARACTERISTICS
160
35
T = +100
C
30
140
T = +25
A
C
25
120
T = -20
A
C
20
100
15
80
V
INT
10
V
INQ
60
5
40
0
-20
0
20
40
60
80
100
120
140
0
5
10
15
20
25
30
35
40
AMBIENT TEMPERATURE in
°
C
INPUT VOLTAGE in VOLTS
Dwg. GK-005
Dwg. GK-006
300
250
200
150
100
50
0
-20
0
20
40
60
80
100
120
140
AMBIENT TEMPERATURE in
°
C
Dwg. GK-007
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
â„¢
°
A
°
°
STR-S6401
AND
STR-S6401F
OFF-LINE
SWITCHING REGULATORS
TYPICAL PWM FLYBACK CONVERSION USING STR-S6401
WARNING:
lethal potentials are present. See text.
+ OUTPUT
NC
7
9
3
STR-S6401
+
1
VOLTAGE
SENSE
+
+
– OUTPUT
2
+
6
5
8
4
Dwg. EK-003
TYPICAL PWM FORWARD CONVERSION USING STR-S6401F
WARNING:
lethal potentials are present. See text.
+ OUTPUT
NC
7
9
3
STR-S6401F
+
1
VOLTAGE
SENSE
+
+
– OUTPUT
2
+
6
5
8
4
Dwg. EK-003-1
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