STR-S6411.PDF

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S6411
STR-S6411 and STR-S6411F
OFF-LINE SWITCHING REGULATORS
STR-S6411 AND
STR-S6411F
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-S6411)
and forward (STR-S6411F) converters operating in a fixed-frequency
PWM mode. Each device incorporates the primary control and drive
circuits with an avalanche-rated high-voltage power MOSFET. Crucial
system parameters such as switching frequency and maximum duty
cycle are fixed during manufacture. The STR-S6411 and STR-S6411F
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.
Dwg. PK-003
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V IN ............................ 35 V
Drain-Source Voltage, V DS ............... 800 V
Drain Current, I D
continuous .....................................
FEATURES
n
PWM Flyback Conversion or Forward Conversion
±
5 A
n
Output Power to 250 W
single pulse, t w
£
1 ms ..................
±
20 A
n
Pulse-by-Pulse Current Limiting
Avalanche Energy, E A
single pulse ............................... 400 mJ
Gate-Source Voltage, V GS ................
n
Fixed-Frequency 100 kHz PWM
±
20 V
n
Avalanche-Rated Power MOSFET Switch
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
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-S6411 or STR-S6411F .
A
TM
MicroSystems, Inc.
TM
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STR-S6411 and STR-S6411F
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
40
RECOMMENDED MAX.
FRAME TEMP. = +100
°
C
10
LIMITED
BY r
DS(on)
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
3.2 W
0
0.1
3.0
10
30
100
300
1000
20
60
100
140
DRAIN-TO-SOURCE VOLTAGE in VOLTS
TEMPERATURE in ° C
Dwg. GK-004-1
Dwg. GK-003
A
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
W
Copyright © 1994 Allegro MicroSystems, Inc.
MicroSystems, Inc.
TM
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STR-S6411 and STR-S6411F
OFF-LINE SWITCHING REGULATORS
600
500
400
SINGLE PULSE
DRAIN CURRENT = 5 A
SUPPLY VOLTAGE = 50 V
ALLOWABLE AVALANCHE ENERGY
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 = 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 = 800 V
–
–
1.2
mA
FET ON Resistance
r DS(on)
V GS = 10 V, I D = 3 A
–
1.8 2.2
W
Forward Transconductance
g fs
V GS = 10 V, I D = 3 A
3.0
–
–
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-S6411
5.1 5.7 6.5
m
s
STR-S6411F
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.
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STR-S6411 and STR-S6411F
OFF-LINE SWITCHING REGULATORS
TYPICAL CHARACTERISTICS
160
35
T = +100
A
C
30
140
T = +25
A
°
C
25
120
T = -20
A
C
20
100
15
V INT
80
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
A
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
MicroSystems, Inc.
°
°
°
TM
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STR-S6411 and STR-S6411F
OFF-LINE SWITCHING REGULATORS
TYPICAL PWM FLYBACK CONVERSION USING STR-S6411
WARNING: lethal potentials are present. See text.
+ OUTPUT
NC
7
9
3
STR-S6411
+
1
VOLTAGE
SENSE
+
+
– OUTPUT
2
+
6
5
8
4
Dwg. EK-003-2
TYPICAL PWM FORWARD CONVERSION USING STR-S6411F
WARNING: lethal potentials are present. See text.
+ OUTPU T
NC
7
9
3
STR-S6411F
+
1
VOLTAGE
SENSE
+
+
– OUTPUT
2
+
6
5
8
4
Dwg. EK-003-3
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