3957 datasheet(6/16 Pages) ALLEGRO

Part #	3957

Description	FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

PDF	16 Pages

Scroll/Zoom	100%

Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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6 / 16 page

3957

FULL-BRIDGE PWM

MICROSTEPPING

MOTOR DRIVER

115 Northeast Cutoff, Box 15036

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

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

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

—

1.0

1.5

µs

to Source OFF, IOUT = 100 mA

Current-Sense Comparator Trip

—

1.4

2.5

µs

to Source OFF, IOUT = 1.5 A

PWM Turn-On Time

tPWM(ON)

IRC Charge ON to Source ON,

—

0.4

0.7

µs

IOUT = 100 mA

IRC Charge ON to Source ON,

—

0.55

0.85

µs

IOUT = 1.5 A

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 k

Ω Load to 25 V

0.3

1.5

3.0

µs

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