A3977KLP View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

MFG CO.

A3977KLP

MICROSTEPPING DMOS DRIVER WITH TRANSLATOR

Allegro MicroSystems 

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3977

MICROSTEPPING DMOS DRIVER

WITH TRANSLATOR

STEP

INPUT

HOME

OUTPUT

100%

70.7%

38.3%

PHASE 1

CURRENT

–38.3%

–70.7%

–100%

100%

70.7%

38.3%

PHASE 2

CURRENT

–38.3%

–70.7%

–100%

8 Microstep/Step Operation

MS1 = MS2 = H, DIR = H

SLOW

DECAY

MIXED

DECAY

SLOW

DECAY

MIXED

DECAY

SLOW

DECAY

MIXED

DECAY

MIXED

DECAY

SLOW

DECAY

Dwg. WK-004-12

The mixed-decay mode is controlled by the percent fast

decay voltage (VPFD). If the voltage at the PFD input is

greater than 0.6VDD then slow-decay mode is selected. If

the voltage on the PFD input is less than 0.21VDD then

fast-decay mode is selected. Mixed decay is between

these two levels.

14

115 Northeast Cutoff, Box 15036

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

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