3957 Ver la hoja de datos (PDF) - Allegro MicroSystems

Número de pieza

componentes Descripción

Fabricante

3957

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

Allegro MicroSystems 

3957

FULL-BRIDGE PWM

MICROSTEPPING

MOTOR DRIVER

Table 1 — PHASE Truth Table

PHASE

H

L

OUTA

H

L

OUTB

L

H

Table 2 — PFD Truth Table

VPFD

≥3.5 V

1.2 V to 2.9 V

≤0.8 V

Description

Slow Current-Decay Mode

Mixed Current-Decay Mode

Fast Current-Decay Mode

Table 3 — DAC Truth Table

DAC Data

D3 D2 D1 D0

HHHH

HHHL

HHL H

HHL L

HL HH

HLHL

HL LH

HL L L

L HHH

L HHL

LHLH

LHL L

L L HH

L LHL

LLLX

Current

Ratio, %

100

VREF/VS

3.00

95.7

3.13

91.3

3.29

87.0

3.45

82.6

3.64

78.3

3.83

73.9

4.07

69.6

4.31

60.9

4.93

52.2

5.74

43.5

6.90

34.8

8.62

26.1

11.49

17.4

17.24

All Outputs Disabled

where VS = ITRIP • RS. See Applications section.

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