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A3972SB 参数 Datasheet PDF下载

A3972SB图片预览
型号: A3972SB
PDF下载: 下载PDF文件 查看货源
内容描述: 双DMOS全桥PWM微电机驱动器 [DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER]
分类和应用: 驱动器运动控制电子器件信号电路光电二极管电动机控制电机
文件页数/大小: 12 页 / 190 K
品牌: ALLEGRO [ ALLEGRO MICROSYSTEMS ]
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3972
CHARGE
PUMP
DUAL DMOS FULL-BRIDGE MICRO-
STEPPING PWM MOTOR DRIVER
VCP
CP1
CP2
OUT
1B
LOAD
SUPPLY
1
GROUND
GROUND
SENSE
1
OUT
1A
STROBE
CLOCK
DATA
1
2
3
4
5
6
7
8
9
9
10
11
12
24
23
22
21
20
19
18
17
16
OSC
SLEEP
V
REG
OUT
2B
LOAD
SUPPLY
2
GROUND
GROUND
SENSE
2
OUT
2A
LOGIC
SUPPLY
MUX
REF
6-BIT DAC
& LOGIC
6-BIT DAC
& LOGIC
V
BB1
V
BB2
SERIAL PORT
V
DD
15
14
13
Dwg. PP-069-3
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
................
-0.3 V to V
DD
+ 0.3 V
Reference Voltage, V
REF
.....................
3 V
Sense Voltage (dc), V
S
................
500 mV
Package Power Dissipation,
P
D
..........................................
3.1 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 tempera-
ture of 150°C.
Designed for pulse-width modulated (PWM) current control of
bipolar microstepping stepper motors, the A3972SB is capable of
continuous 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.
The desired load-current level is set via the serial port with two 6-bit
linear DACs in conjunction with a reference voltage. The six bits of
control allow maximum flexibility in torque control for a variety of step
methods, from microstepping to full-step drive. Load current is set in
1.56% increments of the maximum value.
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 hyster-
esis, transient-suppression diodes, and crossover-current protection.
Special power-up sequencing is not required.
The A3972SB is supplied in a 24-lead plastic DIP with a copper
batwing power tab (suffix ‘B’). The power tab is at ground potential and
needs no electrical isolation.
Data Sheet
29319.33
FEATURES
I
±1.5
A, 50 V Continuous Output Rating
I
Low r
DS(on)
DMOS Output Drivers
I
Optimized Microstepping via 6-Bit Linear DACs
I
Programmable Mixed, Fast, and Slow Current-Decay Modes
I
4 MHz Internal Oscillator for Digital Timing
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
Precision 2 V Reference
I
Inputs Compatible with 3.3 V or 5 V Control Signals
I
Sleep and Idle Modes
Always order by complete part number:
A3972SB
.