3977 datasheet(3/18 Pages) ALLEGRO

Nome de Peças	3977

Descrição Electrónicos	MICROSTEPPING DMOS DRIVER WITH TRANSLATOR

PDF	18 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ALLEGRO [Allegro MicroSystems]

Página de início	http://www.allegromicro.com

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3 / 18 page

3977

MICROSTEPPING DMOS DRIVER

WITH TRANSLATOR

www.allegromicro.com

Table 1. Microstep Resolution Truth Table

MS1

MS2

Resolution

Full step (2 phase)

Half step

Quarter step

Eighth step

A3977xLP

(TSSOP)

LOAD

SUPPLY1

SLEEP

ENABLE

OUT1B

CP2

CP1

VCP

PGND

VREG

STEP

OUT2B

RESET

LOAD

SUPPLY2

SENSE1

HOME

DIR

OUT1A

PFD

RC1

AGND

REF

RC2

LOGIC

SUPPLY

OUT2A

MS2

MS1

SENSE2

÷8

REG

VBB2

VBB1

VDD

Dwg. PP-075

Package Thermal Resistance, RθJA

A3977xLP ......................... 28

°C/W*

A3977xED ........................ 32

°C/W†

A3977xLP ......................... 33

°C/W†

Measured on JEDEC standard “High-K” four-layer board.

† Measured on typical two-sided PCB with three square inches

(1935 mm2) copper ground area.

100

125

150

5.0

1.0

AMBIENT TEMPERATURE IN

°°°°C

4.0

3.0

2.0

SUFFIX '–LP',

θJA = 33

°C/W†

Dwg. GP-018-2A

SUFFIX '–ED', R

θJA = 32

°C/W†

SUFFIX '–LP', R

θJA = 28

°C/W*

SUFFIX 'K–'

SUFFIX 'S–'

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