ALLEGRO 3185 User Manual

查询3189供应商

X

V

CC

1

SUPPLY

32

GROUND

Dwg. PH-003A

3185

THRU

3189

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE OPERATION

These Hall-effect latches are extremely temperature-stable and stress-

resistant sensors especially suited for operation over extended temperature

ranges to +150°C. Superior high-temperature performance is made possible

through a novel Schmitt trigger circuit that maintains operate and release
point symmetry by compensating for temperature changes in the Hall ele­ment. Additionally, internal compensation provides magnetic switch points
that become more sensitive with temperature, hence offsetting the usual
degradation of the magnetic field with temperature. The symmetry capability
makes these devices ideal for use in pulse-counting applications where duty
cycle is an important parameter. The four basic devices (3185, 3187, 3188,
and 3189) are identical except for magnetic switch points.

Each device includes on a single silicon chip a voltage regulator, qua­dratic Hall-voltage generator, temperature compensation circuit, signal
amplifier, Schmitt trigger, and a buffered open-collector output to sink up to
25 mA. The on-board regulator permits operation with supply voltages of 3.8
to 24 volts.

The first character of the part number suffix determines the device

operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix
‘L–’ is for -40°C to +150°C. Three package styles provide a magnetically

optimized package for most applications. Suffix ‘–LT’ is a miniature SOT89/

OUTPUT

TO-243AA transistor package for surface-mount applications; suffix ‘–UA’ is
a three-lead ultra-mini-SIP.

Data Sheet

27609.2B*

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

at T

= +25°C

A

Supply Voltage, VCC............................ 30 V

Reverse Battery Voltage, V

Magnetic Flux Density, B ........... Unlimited

Output OFF Voltage, V
Reverse Output Voltage, V
Continuous Output Current, I
Operating Temperature Range, T

Suffix ‘E–’ ................... -40°C to +85°C

Suffix ‘L–’ ................. -40°C to +150°C

Storage Temperature Range,

T

............................... -65°C to +170°C

S

OUT

........... -30 V

RCC

.................. 30 V

.......... -0.5 V

OUT

..... 25 mA

OUT

A

FEATURES

■ Symmetrical Switch Points

■ Superior Temperature Stability

■ Operation From Unregulated Supply

■ Open-Collector 25 mA Output

■ Reverse Battery Protection

■ Activate With Small, Commercially Available Permanent Magnets

■ Solid-State Reliability

■ Small Size

■ Resistant to Physical Stress

Always order by complete part number: the prefix ‘A’ + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3185ELT .

3185

THRU

3189

HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION

FUNCTIONAL BLOCK DIAGRAM

V

1

CC

REG.

X

3

OUTPUT

2

GROUND

Dwg. FH-005-3

ELECTRICAL CHARACTERISTICS over operating temperature range, at V

= 12 V.

CC

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

Output Saturation Voltage V

OUT(SAT)

Output Leakage Current I

Supply Current I

Output Rise Time t

Output Fall Time t

CC

OFF

CC

r

f

Operating 3.8 — 24 V

I

= 20 mA, B > B

OUT

V

= 24 V, B < B

OUT

OP

RP

— 175 400 mV

— 0.05 5.0 µA

B < BRP (Output OFF) — 4.75 8.0 mA

B > B

R

R

(Output ON) — 5.7 — mA

OP

= 820 Ω, C

L

= 820 Ω, C

L

= 20 pF — 100 — ns

L

= 20 pF — 100 — ns

L

MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.

Part Numbers*

A3185 A3187 A3188 A3189

Characteristic Min. Max. Min. Max. Min. Max. Min. Max.

B

at T

OP

B

RP

B

hys

= 25°C 170 270 50 150 100 180 50 230

A

over operating temp. range 140 300 50 175 80 200 50 250

at T

= 25°C -270 -170 -150 -50 -180 -100 -230 -50

A

over operating temp. range -300 -140 -175 -50 -200 -80 -250 -50

at T

= 25°C 340 540 100 300 200 360 100 460

A

over operating temp. range 280 600 100 350 160 400 100 500

NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); B

As used here, negative flux densities are defined as less than zero (algebraic convention).
*Complete part number includes a suffix to identify operating temperature range (E or L) and package type ( LT or UA).

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1995, 2002 Allegro MicroSystems, Inc.

= hysteresis (BOP - BRP).

hys

300

3185

THRU

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE

OPERATION

TYPICAL OPERATING CHARACTERISTICS

A3185* SWITCH POINTS A3187* SWITCH POINTS

150

3189

200

100

0

-100

SWITCH POINT IN GAUSS

-200

-300

-50

OPERATE POINT

RELEASE POINT

0 50 100

-25 25 75 125

AMBIENT TEMPERATURE IN °°°°C

OUTPUT SATURATION VOLTAGE

300

I = 20 mA

OUT

V = 4.5–24 V

CC

200

100

SATURATION VOLTAGE IN mV

V = 12 V

CC

150

Dwg. GH-026

100

50

0

-50

OPERATE POINT

SWITCH POINT IN GAUSS

-100

-150

-25 25 75 125

-50

0 50 100

AMBIENT TEMPERATURE IN °°°°C

SUPPLY CURRENT

7.0

6.0

5.0

SUPPLY CURRENT IN mA

B ≥ B

OP

V = 12 V

CC

RELEASE POINT

B ≤ B

Dwg. GH-027

V = 12 V

CC

RP

150

0

-50

10

8.0

6.0

4.0

0255075

-25

AMBIENT TEMPERATURE IN °°°°C

SUPPLY CURRENT

B ≥ B

OP

B ≤ B

100

RP

125

150

Dwg. GH-029

4.0

-50

20

15

10

5.0

0 25 50 75

-25

AMBIENT TEMPERATURE IN °°°°C

OPERATE POINT

100

T = +25°C

A

125

SUPPLY CURRENT IN mA

2.0

T = +25°C

A

0

CHANGE IN OPERATE POINT IN GAUSS

0

0

5

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

Dwg. GH-030

-5.0
0

5

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LT or UA).

www.allegromicro.com

150

Dwg. GH-028

Dwg. GH-037