Data Sheet
28190A
STR83145
OSC.
LATCH
LATCHED, UNIVERSAL
INPUT-VOLTAGE SWITCHES
3
4
MT2
GATE
5
2
MT1
COMMON
1
DELAY
+
Dwg. PK-005
ABSOLUTE MAXIMUM RATINGS
Repetitive Peak OFF-State Voltage,
VDRM ............................................. 500 V
Static ON-State Current,
IT(RMS) ............................................ 10 A
Non-Repetitive Surge ON-State Current,
ITSM ............................................... 100 A
Package Power Dissipation,
PD ........................................ See Graph
Triac Junction Temperature, TJ ..... +125°C
Frame Temperature, TM ................ +100°C
Operating Temperature Range,
TA ............................... -20°C to +125°C
Storage Temperature Range,
Tstg ............................. -40°C to +125°C
Intended for power supplies with universal inputs (85 V to 265 V
rms), the STR83145 latched, universal input-voltage switch incorporates timing, control, and drive circuitry with a high-current triac
(bidirectional triode thyristor) switch. The 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 internal sensitive-gate triac is switched by a temperaturecompensated 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. A 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.
The requirements of low transient thermal impedance and steadystate 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.
FEATURES
s Low Duty Cycle Triac Drive for Minimum Dissipation
s For Universal Input Operation Between 85 V rms and 265 V rms
to 10 A
s Internal Latch Prevents False Mode Switching
s Internal Sensitive-Gate Power Triac
s Adjustable Start-Up Delay
s Accurate 145 V rms Switch-Point Voltage
s Low External Parts Count
s Low Power Dissipation
s Low-Power External Parts
Always order by complete part number, e.g., STR83145 .
™