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參數(shù)資料
| 型號(hào)： | 3974 |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER |
| 中文描述： | 雙的DMOS全橋PWM電機(jī)驅(qū)動(dòng) |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 157K |
| 代理商： | 3974 |
D
2
3974
DMOS DUAL FULL-BRIDGE
PWM MOTOR DRIVER
Designed for pulse-width modulated (PWM) current control
of two dc motors, the A3974SED is capable of output currents to
±
1.5 A and operating voltages to 50 V. Internal fixed off-time
PWM current-control timing circuitry can be programmed via a
serial interface to operate in slow, fast, and mixed current-decay
modes.
Independant ENABLE input terminals are provided for use in
controlling the speed and torque of each dc motor with externally
applied PWM control signals.
Synchronous rectification circuitry allows the load current to
flow through the low
r
DS(on)
of the DMOS output driver during
the current decay. This feature will eliminate the need for
external clamp diodes in most applications, saving cost and
external component count, while minimizing power dissipation.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage monitoring of V
DD
and the charge
pump, and crossover-current protection. Special power-up
sequencing is not required.
The A3974SED is supplied in a 44-lead plastic PLCC with
four copper batwing tabs for maximum heat dissipation. The
power tabs are at ground potential and need no electrical isola-
tion.
FEATURES
I
±
1.5 A, 50 V Continuous Output Rating
I
Low
r
DS(on)
DMOS Output Drivers
I
Programmable Slow, Fast, and Mixed Current-Decay Modes
I
Serial-Interface Controls Chip Functions
I
Synchronous Rectification for Low Power Dissipation
I
Internal UVLO and Thermal Shutdown Circuitry
I
Crossover-Current Protection
I
Sleep and Idle Modes
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Load Supply Voltage, V
BB
............................
50 V
Output Current, I
OUT
..................................
±
1.5 A
Logic Supply Voltage, V
DD
..........................
7.0 V
Logic Input Voltage Range, V
IN
Continous ...................
-0.3 V to V
DD
+ 0.3 V
t
W
< 30 ns ...................
-1.0 V to V
DD
+ 1.0 V
Reference Voltage, V
REF
.................................
3 V
Sense Voltage (dc), V
S
Continous ..............................................
0.5 V
t
W
< 1
μ
s ................................................
2.5 V
Package Power Dissipation, P
D
..................
3.9 W
Operating Temperature Range,
T
A
.........................................
-20
°
C to +85
°
C
Junction Temperature, T
J
.........................
+150
°
C
Storage Temperature Range,
T
S
.......................................
-55
°
C to +150
°
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
°
C.
Always order by complete part number:
A3974SED
.
S
6
4
3
2
1
4
4
4
4
4
7
8
9
10
11
12
13
14
15
16
17
29
30
39
38
37
36
35
34
33
32
31
2
2
2
2
2
2
2
2
2
1
1
Dwg. PP-073
GND
GND
LOGIC
SUPPLY
G
G
S
1
O
1
NC
STROBE
CLOCK
DATA
GND
GND
REF
1
REF
2
NC
O
2
N
S
2
G
G
G
L
2
E
2
O
2
NC
V
REG
SLEEP
OSC
GND
GND
CP
CP1
CP2
NC
O
1
N
E
1
L
S
1
G
N
N
N
N
PROGRAM
PWM TIMER
C
÷
V
DD
V
BB1
V
BB2
÷
LOGIC
LOGIC
PROGRAM
PWM TIMER
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