3957 Просмотр технического описания (PDF) - Allegro MicroSystems

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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

AC Timing

PWM RC Fixed Off-time

tOFF RC CT = 470 pF, RT = 43 kΩ

18.2 20.2 22.3

µs

PWM Turn-Off Time

tPWM(OFF) Current-Sense Comparator Trip

to Source OFF, IOUT = 100 mA

—

1.0

1.5

µs

Current-Sense Comparator Trip

to Source OFF, IOUT = 1.5 A

—

1.4

2.5

µs

PWM Turn-On Time

tPWM(ON)

IRC Charge ON to Source ON,

IOUT = 100 mA

—

0.4

0.7

µs

IRC Charge ON to Source ON,

IOUT = 1.5 A

—

0.55 0.85

µs

PWM Minimum On Time

tON(min) VCC = 5.0 V, RT ≥ 43 kΩ, CT = 470 pF 1.0

1.6

2.2

µs

IOUT = 100 mA

Crossover Dead Time

tCODT

1 kΩ Load to 25 V

0.3

1.5

3.0

µs

115 Northeast Cutoff, Box 15036

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

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