IC, STR83145, LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES

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PID# 160539

6,50 CA$
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Description

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 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. 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 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.

FEATURES
■ Low Duty Cycle Triac Drive for Minimum Dissipation
■ For Universal Input Operation Between 85 V rms and 265 V rms to 10 A
■ Internal Latch Prevents False Mode Switching
■ Internal Sensitive-Gate Power Triac
■ Adjustable Start-Up Delay
■ Accurate 145 V rms Switch-Point Voltage
■ Low External Parts Count
■ Low Power Dissipation
■ Low-Power External Parts 

Datasheet

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