3953_05 datasheet(4/15 Pages) ALLEGRO

Part #	3953

Description	FULL-BRIDGE PWM MOTOR DRIVER

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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3953

FULL-BRIDGE

PWM MOTOR DRIVER

115 Northeast Cutoff, Box 15036

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

4

PWM RC Fixed Off-time

tOFF RC

CT = 680 pF, RT= 30 k

Ω, VCC = 3.3 V

18.3

20.4

22.5

µs

PWM Turn-Off Time

tPWM(OFF)

Comparator Trip to Source Off,

—

1.0

1.5

µs

IOUT = 25 mA

Comparator Trip to Source Off,

—

1.8

2.6

µs

IOUT = 1.3 A

PWM Turn-On Time

tPWM(ON)

IRC Charge On to Source On,

—

0.4

0.7

µs

IOUT = 25 mA

IRC Charge On to Source On,

—

0.55

0.85

µs

IOUT = 1.3 A

PWM Minimum On Time

tON(min)

VCC = 3.3 V, RT

≥ 12 kΩ, CT = 680 pF

0.8

1.4

1.9

µs

VCC = 5.0 V, RT

≥ 12 kΩ, CT = 470 pF

0.8

1.6

2.0

µs

Propagation Delay Times

tpd

IOUT =

±1.3 A, 50% to 90%:

ENABLE On to Source On

—

1.0

—

µs

ENABLE Off to Source Off

—

1.0

—

µs

ENABLE On to Sink On

—

1.0

—

µs

ENABLE Off to Sink Off (MODE = L)

—

0.8

—

µs

PHASE Change to Sink On

—

2.4

—

µs

PHASE Change to Sink Off

—

0.8

—

µs

PHASE Change to Source On

—

2.0

—

µs

PHASE Change to Source Off

—

1.7

—

µs

Crossover Dead Time

tCODT

1 k

Ω Load to 25 V, VBB = 50 V

0.3

1.5

3.0

µs

Maximum PWM Frequency

fPWM(max)

IOUT = 1.3 A

70

——

kHz

ELECTRICAL CHARACTERISTICS at TJ = 25˚C, VBB = 5 V to 50 V, VCC = 3.0 V to 5.5 V

(unless otherwise noted.)

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

AC Timing

Continued next page…

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