A3955SLB 查看數據表（PDF） - Allegro MicroSystems
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A3955SLB Datasheet PDF : 13 Pages
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A3955
Full-Bridge PWM Microstepping Motor Driver
ELECTRICAL CHARACTERISTICS (continued) at TA = 25°C, VBB = 5 V to 50 V, VCC = 4.5 V to
5.5 V (unless otherwise noted. )
Characteristic
Control Circuitry (cont’d)
Thermal Shutdown Temp.
Thermal Shutdown Hysteresis
AC Timing
PWM RC Fixed Off-time
PWM Turn-Off Time
PWM Turn-On Time
PWM Minimum On Time
Crossover Dead Time
Symbol
TJ
∆TJ
tOFF RC
tPWM(OFF)
tPWM(ON)
tON(min)
tCODT
Test Conditions
CT = 470 pF, RT= 43 kΩ
Current-Sense Comparator Trip
to Source OFF, IOUT = 100 mA
Current-Sense Comparator Trip
to Source OFF, IOUT = 1.5 A
IRC Charge ON to Source ON,
IOUT = 100 mA
IRC Charge ON to Source ON,
IOUT = 1.5 A
VCC = 5.0 V, RT ≥ 43 kΩ, CT = 470 pF
IOUT = 100 mA
1 kΩ Load to 25 V
Min.
Limits
Typ. Max.
Units
—
165
—
°C
—
15
—
°C
18.2
20.2
22.3
μs
—
1.0
1.5
μs
—
1.4
2.5
μs
—
0.4
0.7
μs
—
0.55
0.85
μs
1.0
1.6
2.2
μs
0.3
1.5
3.0
μs
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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