STR83145 STR84145.PDF
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STR83145 and STR84145
LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES
STR83145
AND
STR84145
LATCHED, UNIVERSAL
INPUT-VOLTAGE SWITCHES
Intended for power supplies with universal inputs (85 V to 265 V
rms), the STR83145 and STR84145 latched, universal input-voltage
switches incorporate timing, control, and drive circuitry with a high-
current triac (bidirectional triode thyristor) switch. Each device senses
the applied ac line potential and automatically switches the rectifier and
associated capacitors between a voltage-doubler configuration (for line
voltages to 141 V) and a full-bridge configuration (for line voltages
greater than 149 V). This eliminates the possibility of user error with
adjustable jumpers or switches. Also, the related switch-mode power
stage need operate only over a reduced range of dc input voltages
when compared with "wide input" power supplies using a bridge rectifier
only. The reduction in dc input voltage range permits the use of lower-
voltage capacitors and leads to a reduction in power stage stresses and
power dissipation. The STR83145 and STR84145 differ only in their
maximum ac current rating (10 A and 12 A, respectively).
The internal sensitive-gate triac is switched by a temperature-
compensated constant-current gate driver driven by a 15 kHz pulse
train to reduce power dissipation. The switch-over voltage is accurately
set during manufacture for consistent operation. An user-adjustable
delay is provided to ensure start-up in the full-bridge mode. Once
established (by an input voltage greater than 149 V rms), an integral
latch holds the full-bridge mode to preclude false application of the
doubler mode during brownouts, voltage droops, or missing cycles.
Dwg. PK-005
The requirements of low transient thermal impedance and steady-
state thermal resistance are satisfied in a molded, 5-lead single in-line
power package. Similar input-voltage switches, with a switch point of
159 V rms, are also available.
ABSOLUTE MAXIMUM RATINGS
Repetitive Peak OFF-State Voltage,
V
DRM
.............................................
500 V
Static ON-State Current, I
T(RMS)
STR83145 ......................................
10 A
STR84145 ......................................
12 A
Non-Repetitive Surge ON-State Current, I
TSM
STR83145 ....................................
100 A
STR84145 ....................................
120 A
Package Power Dissipation,
P
D
........................................
See Graph
Triac Junction Temperature, T
J
.....
+125
FEATURES
n
Low Duty Cycle Triac Drive for Minimum Dissipation
n
For Universal Input Operation Between 85 V rms and 265 V rms
to 10 A or 12 A
n
Internal Latch Prevents False Mode Switching
n
Internal Sensitive-Gate Power Triac
n
Adjustable Start-Up Delay
n
Accurate 145 V rms Switch-Point Voltage
n
Low External Parts Count
n
Low Power Dissipation
°
C
n
Low-Power External Parts
Frame Temperature, T
M
................
+100
°
C
Always order by complete part number:
Part Number Max. On-State Current
STR83145
Operating Temperature Range,
T
A
...............................
-20
°
C to +125
°
C
10 A rms
Storage Temperature Range,
T
stg
.............................
-40
°
C to +125
°
C
STR84145
12 A rms
A
TM
MicroSystems, Inc.
INTERIM DATA SHEET
(Subject to change without notice)
August 16, 1994
TM
STR83145 and STR84145
LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES
FUNCTIONAL BLOCK DIAGRAM
GATE
4
MT1
2
3
MT2
REG.
+
LATCH
DELAY
1
7 V
OSC.
5
COMMON
Dwg. FK-004
ALLOWABLE PACKAGE POWER DISSIPATION
30
27 W
25
INFINITE HEAT SINK
(NO MICA SHEET)
20
150 mm x 150 mm x 2 mm
(WITH MICA SHEET)
100 mm x 100 mm x 2 mm
(WITH MICA SHEET)
75 mm x 75 mm x 2 mm
(WITH MICA SHEET)
15
10
5
P IS LIMITED BY T
D
J
FREE AIR
2 W
0
P IS LIMITED BY T
D
M
0
20
40
60
80
100
120
TEMPERATURE in
°
C
Dwg. GK-010
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
STR83145 and STR84145
LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES
SIMPLIFIED OPERATION
240–373 V peak
246–373 V peak
+
+
+
+
Voltage-Doubler Mode
Full-Bridge Mode
Dwg. EK-006
ELECTRICAL CHARACTERISTICS
at T
A
= +25
°
C, voltage measurements are referenced to Common (pin 3)
(unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
On-State Voltage
V
TM
STR83145, I
T
= 10 A*
–
–
1.8
V
STR84145, I
T
= 12 A*
–
1.6
–
V
Off-State Current
I
DRM
STR83145, V
D
= 500 V
–
–
100
A
STR84145, V
D
= 500 V
–
40
–
A
Starting Voltage
V
S
V
T
= 2 V
–
–
100
V
Startup Time Delay
t
D
C
2
= 1
m
F, V
MT1
³
100 V dc
40
–
100
ms
DC Switch-Over Voltage
V
C
V
DELAY
£
1 V
200 205 210
V
Temperature Coefficient
of Switch-Over Voltage
a
VC
-20
°
C
£
T
M
£
+100
°
C
–
±
45
–
mV/
°
C
Input Current
I
MT1
Voltage-doubler mode, V
MT1
= 195 V
–
–
10
mA
Full-bridge mode, V
MT1
= 400 V
–
–
6.5
mA
Delay Terminal Voltage
V
DELAY
–
–
7.0
V
Triac Gate-Drive Osc. Freq.
f
o
V
gate
ref. MT1, V
MT1
= 100 V
–
15
–
kHz
Latch Reset Voltage
V
R
V
GATE
= 400 mV
2.0
–
15
V
Thermal Resistance
R
q
JM
FET channel to mounting surface
–
–
1.8
°
C/W
NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.
Typical Data is for design information only.
*In practical use, I
T
is recommended derated to 70%.
m
m
STR83145 and STR84145
LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES
TYPICAL CHARACTERISTICS
12
FULL SINE WAVE
CONDUCTION ANGLE
q
1 +
q
2
»
360
°
10
210
q
2
8
q
1
205
6
4
200
2
0
-20
0
20
40
60
80
100
0
2
6
STATIC ON-STATE CURRENT in AMPERES
4
8
10
FRAME TEMPERATURE in
C
Dwg. GK-012
Dwg. GK-013
40
40
30
30
dc
20
20
F
O
10
10
V
MT1
= 100 V
0
0
-25
0
+25
+50
+75
+100
+125
AMBIENT TEMPERATURE in
C
Dwg. GK-008
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. Precau-
tions 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.
A
TM
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
°
°
TM
STR83145 and STR84145
LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES
TYPICAL APPLICATION
-t
°
RBV SERIES
240–373 V peak
R1
+
C3
C4
RM11C
4
+
2
3
C1
+
+
1
C2
+
5
Dwg. EK-007
External component values have been selected for
optimum device performance and reliability. Except for
C
2
, component values other than the following may
result in false operation of these devices.
C
1
= 4.7
3000
1000
F, 400 V
F, 50 V
C
3
= 0.047
m
m
F, 50 V
C
4
= 0.047
m
F, 250 V
300
W
Turn-ON delay (forced full-bridge mode) may be
adjusted for desired system performance:
t
D
T = 25
C
100
68 x C
2
where t
D
is the delay time in ms
C
2
is capacitance in
»
m
F
30
0.3
1.0
3.0
10
30
C2 CAPACITANCE in
m
F
Dwg. GK-011
m
C
2
= 1
R
1
= 4.7
°
M
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