A3987 查看數據表（PDF） - Allegro MicroSystems

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A3987

DMOS Microstepping Driver with Translator

Allegro MicroSystems 

A3987

DMOS Microstepping Driver with Translator

ELECTRICAL CHARACTERISTICS1 (continued) valid at TA = 25°C, VBB = 50 V, unless noted otherwise

Characteristics

Symbol Test Conditions

Min.

Typ.2

Max. Units

Protection Circuitry

Overcurrent Protection Threshold4

Iocpst

2

–

–

A

Overcurrent Blanking

tocp

1

3

μs

Thermal Shutdown Temperature

TTSD

–

165

–

°C

Thermal Shutdown Hysteresis

TTSDhys

–

15

–

°C

1Negative current is defined as coming out of (sourcing) the specified device pin.

2Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for indi-

vidual units, within the specified maximum and minimum limits.

3VERR = [(VREF / 8) – VSENSE ] / (VREF / 8).

4OCP is tested at TA = 25°C in a restricted range and guaranteed by characterization.

tA

tB

STEP

tC

tD

MS1, MS2,

RESET/SLEEP,

or DIR

Time Duration

STEP minimum, HIGH pulse width

STEP minimum, LOW pulse width

Setup time, input change to STEP

Hold time, input change to STEP

Figure 1. Logic Interface Timing Diagram

Symbol

tA

tB

tC

tD

Typ.

1

1

200

200

Unit

μs

μs

ns

ns

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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