str84145 Allegro MicroSystems, Inc., str84145 Datasheet

str84145

Manufacturer Part Number

str84145

Description

Latched, Universal Input-voltage Switches Microsystems

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.STR84145.pdf (8 pages)

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Repetitive Peak OFF-State Voltage,

Static ON-State Current, I

Non-Repetitive Surge ON-State Current, I

Package Power Dissipation,

Triac Junction Temperature, T

Frame Temperature, T

Operating Temperature Range,

Storage Temperature Range,

ABSOLUTE MAXIMUM RATINGS

(subject to change without notice)

STR83145 ...................................... 10 A

STR84145 ...................................... 12 A

STR83145 .................................... 100 A

STR84145 .................................... 120 A

DRM

stg

........................................ See Graph

............................... -20 C to +125 C

............................. -40 C to +125 C

............................................. 500 V

INTERIM ISSUE

August 16, 1994

................ +100 C

T(RMS)

..... +125 C

Dwg. PK-005

TSM

™

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.

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).

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.

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

STR83145

STR84145

Always order by complete part number:

Part Number

STR83145

STR84145

Low Duty Cycle Triac Drive for Minimum Dissipation

For Universal Input Operation Between 85 V rms and 265 V rms

to 10 A or 12 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

Intended for power supplies with universal inputs (85 V to 265 V

The internal sensitive-gate triac is switched by a temperature-

The requirements of low transient thermal impedance and steady-

INPUT-VOLTAGE SWITCHES

Max. On-State Current

10 A rms

12 A rms

LATCHED, UNIVERSAL

AND

Each device senses

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str84145 Summary of contents

Page 1

... 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 kHz pulse train to reduce power dissipation ...

Page 2

... STR83145 STR84145 AND LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES 2 MT1 DELAY 1 5 COMMON ALLOWABLE PACKAGE POWER DISSIPATION FUNCTIONAL BLOCK DIAGRAM REG. + LATCH + 7 V OSC 150 mm x 150 (WITH MICA SHEET) 100 mm x 100 (WITH MICA SHEET) ...

Page 3

... SIMPLIFIED OPERATION 240–373 V peak + + +25 C, voltage measurements are referenced to Common (pin 3) A Symbol Test Conditions V STR83145 STR84145 STR83145 500 V DRM D STR84145 500 MT1 DELAY - +100 C ...

Page 4

... STR83145 STR84145 AND LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES 210 205 200 - FRAME TEMPERATURE in C ...

Page 5

... STR83145 STR84145 AND LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES -t RM11C External component values have been selected for optimum device performance and reliability. Except for C , component values other than the following may 2 result in false operation of these devices 4.7 F, 400 0.047 ...

Page 6

... STR83145 STR84145 AND LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES 0.126 Ø 0.004 NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Recommended mounting hardware torque: 4.34 – 5.79 lbf•ft. 3. The hatched area is exposed heat spreader, electrically common to pin 3. 4. Recommended 0.003" to 0.006" thick mica insulator with metal-oxide-filled, alkyl-degenerated oil base, silicone grease (Dow Corning 340, or equivalent) ...

Page 7

... STR83145 STR84145 AND LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES 3.2 0.1 NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Recommended mounting hardware torque: 6 – 8 kgf•cm (0.588 – 0.785 Nm). 3. The hatched area is exposed heat spreader, electrically common to pin 3. 4. Recommended 0. 0.15 mm thick mica insulator with metal-oxide-filled, alkyl-degenerated oil base, silicone grease (Dow Corning 340, or equivalent) ...

Page 8

... STR83145 STR84145 AND LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES The products described here are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of their products ...

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