A3973KB View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

MFG CO.

A3973KB

DUAL FULL BRIDGE PROTECTED MOTOR DRIVER

Allegro MicroSystems 

1 2 3 4 5

Page 4 of 5

3976 Dual Protected PWM Motor Driver

ELECTRICAL CHARACTERISTICS at TA = -40°C +125°C, VBB = 30 V, VDD = 5.0 V (unless noted otherwise)

Limits

Characteristics

Fault Circuitry

Fault Output Leakage

Fault Output Low

Fault Output Current

Output Open Load Current

Thermal Fault Temp.

Thermal Fault Hysteresis

OVLO Enable Threshold

OVLO Hysteresis

Symbol Test Conditions

IF-LEAK

VFL

IF

I OUT-O.L.

TF

TFHYS

VF = 5 Volts, No Faults

Fault Condition Asserted, IF=25 µA

VF = 5 Volts, ENABLE=3.5V

VBB = 12 V

Vbb rising

Min. Typ. Max. Units

-

-

10

µA

–

0.8

V

25

50

75

µA

–

2

–

mA

–

170

–

°C

–

10

–

°C

27

30

33

V

1.5

V

UVLO Enable Threshold

UVLO Hysteresis

Vcc falling

3.5

4

4.5

V

–

400

–

mV

Timing

Open Fault to Reset Delay

PHASE_X Delay to OPEN Fault

PHASE_X Delay to S.C. Fault

ENABLE_X Delay to Fault

Propagation Delay Times

trs

VBB = 12 V

tof

VBB = 12 V

tSC

VBB = 12 V

tof

VBB = 12 V

tpd

IOUT = ±0.35A, 50%TO 90%

ENABLE ON TO SOURCE ON

ENABLE OFF TO SOURCE OFF

ENABLE ON TO SINK ON

ENABLE OFF TO SINK OFF

–

–

25

µs

–

30

–

µs

–

5

–

µs

–

5

–

µs

–

0.3

µs

–

0.4

µs

–

0.3

µs

–

0.2

µs

PHASE CHANGE TO SINK ON

–

4.0

µs

Cross Over Dead Time

tCODT

PHASE CHANGE TO SINK OFF

PHASE CHANGE TO SOURCE ON

PHASE CHANGE TO SOURCE OFF

1KΩ (1k+1k) Load (VBB to OUT to GND)

–

0.3

µs

–

4.0

µs

–

0.4

µs

0.5

3.0

6.0

µs

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