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3968 Datasheet(HTML) 4 Page - Allegro MicroSystems

Part No. 3968
Description  DUAL FULL-BRIDGE PWM MOTOR DRIVER WITH BRAKE
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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3968 Datasheet(HTML) 4 Page - Allegro MicroSystems

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3968
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
WITH BRAKE
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS at T
A = +25°C, VBB = 30 V, VCC = 4.75 V to 5.5 V, VREF = 2 V,
V
S = 0 V, 56 k& 680 pF RC to Ground (unless noted otherwise) (cont.)
Control Logic (continued)
NOTES:1. Typical Data is for design information only.
2. Negative current is defined as coming out of (sourcing) the specified device terminal.
PWM RC Frequency
f
osc
C
T = 680 pF, RT = 56 kΩ
22.9
25.4
27.9
kHz
PWM Propagation Delay Time
t
PWM
Comparator Trip to Source OFF
1.0
1.4
µs
Cycle Reset to Source ON
0.8
1.2
µs
Cross-Over Dead Time
t
codt
1 k
Ω Load to 25 V
0.2
1.8
3.0
µs
Propagation Delay Times
t
pd
I
OUT = ±650 mA, 50% to 90%:
Disable OFF to Source ON
100
ns
Disable ON to Source OFF
500
ns
Disable OFF to Sink ON
200
ns
Disable ON to Sink OFF
200
ns
Brake Enable to Sink ON
2200
ns
Brake Enable to Source OFF
200
ns
Thermal Shutdown Temp.
T
J
165
°C
Thermal Shutdown Hysteresis
∆T
J
—15
°C
UVLO Enable Threshold
V
T(UVLO)+
Increasing V
CC
4.1
4.6
V
UVLO Hysteresis
V
T(UVLO)hys
0.1
0.6
V
Logic Supply Current
I
CC(ON)
Both bridges ON (forward or reverse)
50
mA
I
CC(OFF)
All INPUTs = 2.4 V
9.0
mA
I
CC(BRAKE)
All INPUTs = 0.8 V
95
mA


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