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STR83145

Allegro
Part Number STR83145
Manufacturer Allegro
Description LATCHED / UNIVERSAL INPUT-VOLTAGE SWITCHES
Published May 2, 2005
Detailed Description STR83145 AND STR84145 INTERIM ISSUE (subject to change without notice) August 16, 1994 Data Sheet 28190 LATCHED, UNIVE...
Datasheet PDF File STR83145 PDF File

STR83145
STR83145

Overview
STR83145 AND STR84145 INTERIM ISSUE (subject to change without notice) August 16, 1994 Data Sheet 28190 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 highcurrent 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 lowervoltage 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 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.
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.
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.
LATCH 2 1 3 4 MT1 Dwg.
PK-005 AB...


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