參數(shù)資料
型號： 3961
廠商： Allegro MicroSystems, Inc.
英文描述： DIODE SWITCHING QUAD COMMON-CATHODE 70V 250mA-Io 200mW 4ns-trr SOT-363 3K/REEL
中文描述： 雙全橋PWM電機驅動
文件頁數(shù)： 1/10頁
文件大?。?/td> 91K
代理商： 3961
3961
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
DSCONTNUEDPRODUCT
. . . . . . . . . . . . . . . .
-55C to +150C
FORREFERENCEONLY
ture of 150C.
SENSE
V
GROUND
GROUND
GROUND
REF
V
RC
GROUND
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
16
15
1
1
BB1
OUT
1
OUT
1B
2B
SENSE
OUT
2A
V
BB2
FULL/PD
I
RC
2
2
PHASE
ENABLE
11
12
1
1
14
13
PHASE
ENABLE
2
2
REF
V
IN
OUT
1A
2
V
CC
Designed for pulse-width modulated (PWM) current control of
bipolar stepper motors, the A3961S— is capable of continuous output
off-time PWM current-control circuitry can be used to regulate the
maximum load current to a desired value. An internal precision voltage
reference is provided to improve motor peak current control accuracy.
The peak load current limit is set by the user’s selection of an external
resistor divider and current-sensing resistors.
The fixed off-time pulse duration is set by user-selected external
RC timing networks. 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 transi-
tions. This eliminates the need for two external RC filter networks on
the current-sensing comparator inputs.
For each bridge the PHASE input controls load current polarity by
selecting the appropriate source and sink driver pair. For each bridge
the ENABLE input, when held high, disables the output drivers. Special
power-up sequencing is not required. Internal circuit protection includes
thermal shutdown with hysteresis, transient-suppression diodes, and
crossover-current protection.
The A3961S— is supplied in a choice of two power packages:
24-pin dual-in-line plastic package with copper heat-sink tabs and
24-lead plastic SOIC with copper heat-sink tabs. In both packages the
power tab is at ground potential and needs no electrical isolation.
FEATURES
I
±
800 mA Continuous Output Current Rating
I
45 V Output Voltage Rating
I
Internal PWM Current Control, Saturated Sink Drivers
I
Internally Generated Precision 2.5 V Reference
I
Internal Transient-Suppression Diodes
I
Internal Thermal-Shutdown Circuitry
I
Crossover-Current Protection, UVLO Protection
PART NUMBER
PACKAGE
R
θ
JA
R
θ
JT
A3961SB
24-Pin DIP
40
°
C/W
6
°
C/W
A3961SLB
24-Lead SOIC
55
°
C/W
6
°
C/W
Always order by complete part number:
DUAL FULL-BRIDGE PWM MOTOR DRIVER
Note the A3961SB (DIP) and the A3961SLB
(SOIC) are electrically identical and share a
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, V
BB
. . . . . . . . . .
45 V
Output Current, I
OUT
. . . . . . . . . .
±
800 mA*
Logic Supply Voltage, V
CC
. . . . . . . . .
7.0 V
Logic Input Voltage Range,
V
IN
. . . . . . . . . . .
-0.3 V to V
CC
+ 0.3 V
Sense Voltage, V
SENSE
. . . . . . . . . . . .
1.0 V
Reference Output Current,
I
REF OUT
. . . . . . . . . . . . . . . . . . .
1.0 mA
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . .
See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . . .
-20C to +85C
Junction Temperature, T
J
. . . . . . .
+150C
Storage Temperature Range,
* 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 tempera-
Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.
D
2
3961
相關PDF資料
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