3957 查看數據表（PDF） - Allegro MicroSystems

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产品描述 (功能)

生产厂家

3957

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

Allegro MicroSystems 

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.)

Characteristic

Symbol Test Conditions

Min.

Limits

Typ. Max.

Units

Control Circuitry (continued)

Mixed-Decay Comparator

Trip Points

Mixed-Decay Comparator

Input Offset Voltage

Mixed-Decay Comparator

Hysteresis

Reference Input Current

Reference Divider Ratio

Digital-to-Analog Converter

Accuracy*

Current-Sense Comparator

Input Offset Voltage*

Step Reference

Current Ratio

Thermal Shutdown Temp.

Thermal Shutdown Hyst.

VPFD

VIO(PFD)

∆VIO(PFD)

IREF

VREF/VS

—

VIO(S)

SRCR

TJ

∆TJ

Slow Current-Decay Mode

Mixed Current-Decay Mode

Fast Current-Decay Mode

VREF = 0 V to 2.5 V

at trip, D0 = D1 = D2 = D3 = 2 V

1.0 V < VREF ≤ 2.5 V

0.5 V < VREF ≤ 1.0 V

VREF = 0 V

D0 = D1 = D2 = D3 = 0.8 V

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

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

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

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

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

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

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

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

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

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

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

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

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

D0 = D1 = D2 = D3 = 2 V

3.5

—

—

V

1.2

—

2.9

V

—

—

0.8

V

—

0

±20

mV

5.0

25

55

mV

—

—

±5.0

µA

—

3.0

—

—

—

—

±3.0

%

—

—

±4.0

%

—

±16

—

mV

—

0

—

%

—

17.4

—

%

—

26.1

—

%

—

34.8

—

%

—

43.5

—

%

—

52.2

—

%

—

60.9

—

%

—

69.6

—

%

—

73.9

—

%

—

78.3

—

%

—

82.6

—

%

—

87.0

—

%

—

91.3

—

%

—

95.7

—

%

—

100

—

%

—

165

—

°C

—

15

—

°C

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

Continued next page…

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