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A3955SB-T 参数 Datasheet PDF下载

A3955SB-T图片预览
型号: A3955SB-T
PDF下载: 下载PDF文件 查看货源
内容描述: 全桥PWM微电机驱动器 [Full-Bridge PWM Microstepping Motor Driver]
分类和应用: 驱动器电机
文件页数/大小: 13 页 / 423 K
品牌: ALLEGRO [ ALLEGRO MICROSYSTEMS ]
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A3955
Full-Bridge PWM Microstepping Motor Driver
Features and Benefits
±1.5 A continuous output current
50 V output voltage rating
Internal PWM current control
3-bit nonlinear DAC
Fast, mixed fast/slow, and slow current-decay modes
Internal transient-suppression diodes
Internal thermal shutdown circuitry
Crossover-current and UVLO protection
Description
The A3955 is designed to drive one winding of a bipolar
stepper motor in a microstepping mode. The outputs are
rated for continuous output currents to ±1.5 A and operating
voltages to 50 V. Internal pulse width modulated (PWM) current
control combined with an internal three-bit nonlinear digital-
to-analog converter allows the motor current to be controlled
in full-, half-, quarter-, or eighth-step (microstepping) modes.
Nonlinear increments minimize the number of control lines
necessary for microstepping. Microstepping provides increased
step resolution, and reduces torque variations and resonance
problems at low speed.
Internal circuitry determines whether the PWM current-control
circuitry operates in a slow (recirculating) current-decay
mode, fast (regenerative) current-decay mode, or in a mixed
current-decay mode in which the off-time is divided into a
period of fast current decay and with the remainder of the
fixed off-time spent in slow current decay. The combination of
user-selectable current-sensing resistor and reference voltage,
digitally selected output current ratio; and slow, fast, or mixed
current-decay modes provides users with a broad, variable
range of motor control.
Continued on the next page…
Packages:
Package B, 16-pin DIP
with exposed tabs
Not to scale
Package LB, 16-pin SOIC
with internally fused pins
Functional Block Diagram
LOGIC
SUPPLY
LOAD
SUPPLY
OUTA
OUTB
PHASE
7
6
V
CC
10
15
16
V
BB
GROUND
4
5
12
13
UVLO
& TSD
MIXED-DECAY
COMPARATOR
PWM LATCH
BLANKING
GATE
CURRENT-SENSE
COMPARATOR
SENSE
11
PFD
1
+
BLANKING
R
Q
S
+ –
RC
3
V TH
2
REF
+
÷3
D/A
DISABLE
V
CC
RS
8
D
2
9
D
1
14
D
0
RT
CT
Dwg. FP-042
29319.41E