3968
A3968SLB
(SOIC)
OUT
1A
INPUT
1A
INPUT
1B
GROUND
SENSE
1
OUT
1B
LOAD
SUPPLY
REFERENCE
1
2
3
4
5
6
7
8
V
REF
V
BB
V
CC
RC
LOGIC
LOGIC
V
BB
16
15
14
13
12
11
10
9
OUT
2A
INPUT
2A
INPUT
2B
GROUND
SENSE
2
OUT
2B
LOGIC
SUPPLY
RC
DUAL FULL-BRIDGE PWM MOTOR DRIVER WITH BRAKE
The A3968SA and A3968SLB are designed to bidirectionally control two
dc motors. Each device includes two H-bridges capable of continuous output
currents of 鹵650 mA and operating voltages to 30 V. Motor winding current
can be controlled by the internal fixed-frequency, pulse-width modulated
(PWM), current-control circuitry. The peak load current limit is set by the
user鈥檚 selection of a reference voltage and current-sensing resistors. Except
for package style and pinout, the two devices are identical.
The fixed-frequency pulse duration is set by a user-selected external RC
timing network. The capacitor in the RC timing network also determines a
user-selectable blanking window that prevents false triggering of the PWM
current-control circuitry during switching transitions.
To reduce on-chip power dissipation, the H-bridge power outputs have
been optimized for low saturation voltages. The sink drivers feature the
Allegro
廬
patented Satlington
廬
output structure. The Satlington outputs
combine the low voltage drop of a saturated transistor and the high peak
current capability of a Darlington.
For each bridge, the INPUT
A
and INPUT
B
terminals determine the load
current polarity by enabling the appropriate source and sink driver pair. When
a logic low is applied to both INPUTs of a bridge, the braking function is
enabled. In brake mode, both source drivers are turned OFF and both sink
drivers are turned ON, thereby dynamically braking the motor. When a logic
high is applied to both INPUTs of a bridge, all output drivers are disabled.
Special power-up sequencing is not required. Internal circuit protection
includes thermal shutdown with hysteresis, ground-clamp and flyback diodes,
and crossover-current protection.
The A3968SA is supplied in a 16-pin dual in-line plastic package. The
A3968SLB is supplied in a 16-pin plastic SOIC with copper heat sink tabs.
The power tab is at ground potential and needs no electrical isolation. The LB
package is available in a lead (Pb) free version (100% matte tin leadframe).
Data Sheet
29319.29E
Dwg. PP-066
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, V
BB
...................
30 V
Output Current, I
OUT
(peak) ..........
鹵750 mA
(continuous) ..............................
鹵650 mA
Logic Supply Voltage, V
CC
.................
7.0 V
Input Voltage, V
in
.....
-0.3 V to V
CC
+ 0.3 V
Sense Voltage, V
S
................................
1.0 V
Package Power Dissipation (T
A
= 25擄C), P
D
A3968SA .....................................
1.8 W*
A3968SLB ...................................
1.4 W*
Operating Temperature Range,
T
A
...................................
-20擄C to +85擄C
Junction Temperature,
T
J
.................................................
+150擄C
Storage Temperature Range,
T
S
.................................
-55擄C to +150擄C
Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking.
Under any set of conditions, do not exceed the
specified current rating or a junction temperature
of 150擄C.
* Per SEMI G42-88 Specification,
Thermal Test
Board Standardization for Measuring Junction-
to-Ambient Thermal Resistance of Semiconductor
Packages.
FEATURES
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鹵650 mA Continuous Output Current
30 V Output Voltage Rating
Internal Fixed-Frequency PWM Current Control
Satlington Sink Drivers
Brake Mode
User-Selectable Blanking Window
Internal Ground-Clamp & Flyback Diodes
Internal Thermal-Shutdown Circuitry
Crossover-Current Protection and UVLO Protection
Part Number
A3968SLB-T
A3968SLBTR-T
*
Pb-free*
Yes
Yes
R
胃JA
(擄C/W)
90
90
R
胃JT
(擄C/W)
6
6
Package
16-Lead SOIC
16-Lead SOIC
Packing
47 per tube
1000 per reel
Pb-based variants are being phased out of the product line. The variants cited in this
footnote are in production but have been determined to be LAST TIME BUY. This
classification indicates that sale of this device is currently restricted to existing customer
applications. The variants should not be purchased for new design applications because
obsolescence in the near future is probable. Samples are no longer available. Status
change: October 31, 2006. Deadline for receipt fo LAST TIME BUY orders: April 27, 2007.
These variants include: A3968SA, A3968SLB, and A3968SLBTR.
3968_03相關(guān)型號(hào)PDF文件下載
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DUAL FULL-BRIDGE PWM MOTOR DRIVER WITH BRAKE
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DUAL FULL-BRIDGE PWM MOTOR DRIVER WITH BRAKE
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DUAL FULL-BRIDGE PWM MOTOR DRIVER WITH BRAKE
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