3955 datasheet(3/16 Pages) ALLEGRO

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3955

FULL-BRIDGE PWM

MICROSTEPPING

MOTOR DRIVER

ELECTRICAL CHARACTERISTICS at TA = 25˚C, VBB = 5 V to 50 V, VCC = 4.5 V to 5.5 V

(unless otherwise noted.)

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Load Supply Voltage Range

VBB

Operating, IOUT = ±1.5 A, L = 3 mH

VCC

—50

Output Leakage Current

ICEX

VOUT = VBB

—

<1.0

µA

VOUT = 0 V

—

<-1.0

-50

µA

Output Saturation Voltage

VCE(SAT)

VS = 1.0 V:

(Forward or Reverse Mode)

Source Driver, IOUT = -0.85 A

—

1.0

1.2

Source Driver, IOUT = -1.5 A

—

1.3

1.5

Sink Driver, IOUT = 0.85 A

—

0.5

0.6

Sink Driver, IOUT = 1.5 A

—

1.3

1.5

Sense Current Offset

ISO

IS - IOUT, IOUT = 850 mA,

VS = 0 V, VCC = 5 V

Clamp Diode Forward Voltage

IF = 0.85 A

—

1.2

1.4

(Sink or Source)

IF = 1.5 A

—

1.4

1.7

Motor Supply Current

IBB(ON)

—

2.0

4.0

(No Load)

IBB(OFF)

D0 = D1 = D2 = 0.8 V

—

1.0

µA

Continued next page…

Power Outputs

100

125

150

TEMPERATURE IN

°C

Dwg. GP-049-2A

= 6.0

°C/W

θJT

SUFFIX 'B', R

= 43

°C/W

θJA

SUFFIX 'LB', R

= 63

°C/W

θJA

Table 3 — DAC Truth Table

DAC DATA

Current

Ratio, %

VREF/VS

100

3.00

92.4

3.25

83.1

3.61

70.7

4.24

55.5

5.41

38.2

7.85

19.5

15.38

All Outputs Disabled

where VS = ITRIP•RS. See Applications section.

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