A3955SLB datasheet(4/16 Pages) ALLEGRO

Part #	A3955SLB

Description	FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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4 / 16 page

3955

FULL-BRIDGE PWM

MICROSTEPPING

MOTOR DRIVER

115 Northeast Cutoff, Box 15036

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

* The total error for the VREF/VS function is the sum of the D/A error and the current-sense comparator input offset voltage.

Logic Supply Voltage Range

VCC

Operating

4.5

5.0

5.5

V

Reference Voltage Range

VREF

Operating

0.5

—

2.5

V

UVLO Enable Threshold

VCC = 0 ¡ 5 V

3.35

3.70

4.05

V

UVLO Hysteresis

0.30

0.45

0.60

V

Logic Supply Current

ICC(ON)

—42

50

mA

ICC(OFF)

D0 = D1 = D2 = 0.8 V

—

12

16

mA

Logic Input Voltage

VIN(1)

2.0

—

V

VIN(0)

—

0.8

V

Logic Input Current

IIN(1)

VIN = 2.0 V

—

<1.0

20

µA

IIN(0)

VIN = 0.8 V

—

<-2.0

-200

µA

Mixed-Decay Comparator

VPFD

Slow Current-Decay Mode

3.5

—

V

Trip Points

Mixed Current-Decay Mode

1.1

—

3.1

V

Fast Current-Decay Mode

—

0.8

V

Mixed-Decay Comparator

VIO(PFD)

—0

±20

mV

Input Offset Voltage

Mixed-Decay Comparator

∆V

IO(PFD)

5.0

25

55

mV

Hysteresis

Reference Input Current

IREF

VREF = 0 V to 2.5 V

—

±5.0

µA

Reference Divider Ratio

VREF/VS

at trip, D0 = D1 = D2 = 2 V

—

3.0

—

Digital-to-Analog Converter

—

1.0 V < VREF ≤ 2.5 V

—

±3.0

%

Accuracy*

0.5 V < VREF ≤ 1.0 V

—

±4.0

%

Current-Sense Comparator

VIO(S)

VREF = 0 V

—

±5.0

mV

Input Offset Voltage*

Step Reference

SRCR

D0 = D1 = D2 = 0.8 V

—

0

—

%

Current Ratio

D0 = 2 V, D1 = D2 = 0.8 V

—

19.5

—

%

D0 = 0.8 V, D1 = 2 V, D2 = 0.8 V

—

38.2

—

%

D0 = D1 = 2 V, D2 = 0.8 V

—

55.5

—

%

D0 = D1 = 0.8 V, D2 = 2 V

—

70.7

—

%

D0 = 2 V, D1 = 0.8 V, D2 = 2 V

—

83.1

—

%

D0 = 0.8 V, D1 = D2 = 2 V

—

92.4

—

%

D0 = D1 = D2 = 2 V

—

100

—

%

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

Control Circuitry

Continued next page…

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