A3197LLT 판매점 - PROTECTED/ HIGH-TEMPERATURE/ OPEN-COLLECTOR HALL-EFFECT LATCH

3197

PROTECTED, HIGH-TEMPERATURE,

OPEN-COLLECTOR HALL-EFFECT LATCH

PTCT

Dwg. PH-003-2

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC

(100 ms) ................................... 115 V*

(continuous) ............................... 28 V*

Reverse Battery Voltage, VRCC

(100 ms) ................................... -100 V

(continuous) ............................... -35 V

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

Output OFF Voltage, VOUT ................. 26 V

Reverse Output Voltage VOUT ......... -0.5 V

Continuous Output Current,

IOUT .......................................... 35 mA*

Reverse Output Current,

IOUT ........................................ -100 mA

Package Power Dissipation,

PD ....................................... See Graph

Junction Temperature, TJ ................. 170°C

Operating Temperature Range,

TA .......................................... -40°C to +150°C

Storage Temperature, TS .................. 170°C

*Fault condition, internal overvoltage shutdown

above 28 V; output current limited above 35 mA.

These open-collector Hall-effect latches are capable of sensing magnetic

fields while using an unprotected power supply. The A3197LLT and A3197LU

can provide position and speed information by providing a digital output for

magnetic fields that exceed their predefined switch points. These devices

operate down to zero speed and have switch points that are designed to be

extremely stable over a wide operating temperature and voltage range. The

latching characteristics make them ideal for use in pulse counting applications

when used with a multi-pole ring magnet. Thermal and output short-circuit

protection allow an increased wiring harness fault tolerance. The temperature

compensated switch points, the wide operating voltage range, and the integrated

protection make these devices ideal for use in automotive applications such as

transmission speed sensors and integrated wheel bearing speed sensors.

Each monolithic device contains an integrated Hall-effect transducer, a

temperature-compensated comparator, a voltage regulator, and a buffered 35 mA

output sink stage. Supply protection is made possible by the integration of

overvoltage and undervoltage shutdown circuitry that monitor supply fault

conditions and shut down the IC. Noise shutdown circuitry (patent applied for)

prevents the propagation of supply transients to the logic load. Output protec-

tion circuitry includes a current limit loop that limits the maximum output sink

current, and thermal protection circuitry that shuts down the device during an

over-heating condition such as with a shorted load.

The A3197LLT and A3197LU are rated for operation over an extended

temperature range of -40°C to +150°C. They are supplied in a three-lead SIP

(suffix ‘U’) or a surface-mount SOT-89 (suffix ‘LT’).

FEATURES

I Internal Protection For Automotive (ISO/DIN) Transients

I Operation From Unregulated Supply

I Reverse Battery Protection

I Undervoltage Lockout

I Supply Noise-Suppression Circuitry

I Output Short-Circuit Protection

I Output Zener Clamp

I Thermal Protection

I Symmetrical Latching Switch Points

I Operable with Multipole Ring Magnets

Always order by complete part number, e.g., A3197LU .

3197

PROTECTED, HIGH-TEMP.,

OPEN-COLLECTOR

HALL-EFFECT LATCH

1 VCC

FUNCTIONAL BLOCK DIAGRAM

OVERVOLT.

LOCKOUT

REG.

Dwg. FH-012A

POWER UP &

TRANSIENT

PROTECTION

CONTROL

THERMAL CURRENT

SHUTDOWN

LIMIT

<1Ω

3 OUTPUT

2 GROUND

800

700

600

"U" PACKAGE

500 RθJA = 183°C/W

400

"LT" PACKAGE

RθJA = 258°C/W

300

200

100

20 40 60 80 100 120 140 160 180

AMBIENT TEMPERATURE IN °C

Dwg. GH-054A

NOTE – Permitted duty cycle will be less than 100%

at maximum ambient temperature with high supply

voltages, i.e., TA ≥ 140°C, VCC ≥ 12 V, and the “LT”

package. The thermal shutdown circuitry does not

protect the device from these stresses (see Internal

Protective Features).

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

A3197LLT 반도체 회로 부품 판매점

PROTECTED/ HIGH-TEMPERATURE/ OPEN-COLLECTOR HALL-EFFECT LATCH

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