3957 datasheet(5/16 Pages) ALLEGRO

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3957

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

Control Circuitry (continued)

Mixed-Decay Comparator

VPFD

Slow Current-Decay Mode

3.5

—

Trip Points

Mixed Current-Decay Mode

1.2

—

2.9

Fast Current-Decay Mode

—

0.8

Mixed-Decay Comparator

VIO(PFD)

—0

±20

Input Offset Voltage

Mixed-Decay Comparator

∆V

IO(PFD)

5.0

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 = D3 = 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

—

±16

—

Input Offset Voltage*

Step Reference

SRCR

D0 = D1 = D2 = D3 = 0.8 V

—

Current Ratio

D1 = 2 V, D0 = D2 = D3 = 0.8 V

—

17.4

—

D0 = D1 = 2 V, D2 = D3 = 0.8 V

—

26.1

—

D2 = 2 V, D0 = D1 = D3 = 0.8 V

—

34.8

—

D0 = D2 = 2 V, D1 = D3 = 0.8 V

—

43.5

—

D1 = D2 = 2 V, D0 = D3 = 0.8 V

—

52.2

—

D0 = D1 = D2 = 2 V, D3 = 0.8 V

—

60.9

—

D3 = 2 V, D0 = D1 = D2 = 0.8 V

—

69.6

—

D0 = D3 = 2 V, D1 = D2 = 0.8 V

—

73.9

—

D1 = D3 = 2 V, D0 = D2 = 0.8 V

—

78.3

—

D0 = D1 = D3 = 2 V, D2 = 0.8 V

—

82.6

—

D2 = D3 = 2 V, D0 = D1 = 0.8 V

—

87.0

—

D0 = D2 = D3 = 2 V, D1 = 0.8 V

—

91.3

—

D1 = D2 = D3 = 2 V, D0 = 0.8 V

—

95.7

—

D0 = D1 = D2 = D3 = 2 V

—

100

—

Thermal Shutdown Temp.

—

165

—

°C

Thermal Shutdown Hyst.

∆T

—15

—

°C

Continued next page…

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

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