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参数资料
| 型号： | A3992SLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR PWM DUAL 24-TSSOP |
| 标准包装： | 1 |
| 应用： | PWM 电机驱动器，步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±1.5A |
| 电压 - 负载： | 15 V ~ 50 V |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1170-6 |
A3992
DMOS Dual Full-Bridge
Microstepping PWM Motor Driver
Synchronous Recti ? cation. When a PWM off-cycle
is triggered, by a bridge disable command or internal
? xed off-time cycle, load current recirculates accord-
ing to the decay mode selected by control logic. The
A3992 synchronous recti ? cation feature turns on the
appropriate MOSFETs during current decay, and effec-
tively shorts out the body diodes with the low R DS(on)
driver. This lowers power dissipation signi ? cantly, and
can eliminate the need for external Schottky diodes for
most applications.
Three distinct modes of operation can be con ? gured
with the two serial port control bits:
1. Active mode . Prevents reversal of load current.
Turns off synchronous recti ? cation when a 0 current
level is detected.
2. Passive mode . Allows reversal of current, but will
turn off the synchronous recti ? er circuit if the load
current inversion ramps up to the current limit.
3. Disabled . Prevents MOSFET switching during load
recirculation in fast decay portion of the off-time. Dur-
ing the slow decay portion of the off-time, the low-side
switch turns on, which recirculates current through the
low-side MOSFET and low-side body diode.
Applications Notes
Current Sensing. To minimize inaccuracies in sens-
ing the I PEAK current level caused by ground trace I ? R
drops, the sense resistor should have an independent
ground return to the GND terminal of the device. For
low value sense resistors, the I ? R drops in the PCB
sense resistor traces can be signi ? cant and should
be taken into account. The use of sockets should
be avoided because they can introduce variation in
R SENSE due to their contact resistance.
Allegro MicroSystems recommends a value of R SENSE
given by:
R SENSE = 0.5 / I TRIP MAX .
Thermal Protection . Circuitry turns off all drivers
when the junction temperature reaches 165°C typical.
It is intended only to protect the device from failures
due to excessive junction temperatures, and should not
imply that output short circuits are permitted. Thermal
shutdown has a hysteresis of approximately 15°C.
Serial Port Write Timing Operation. Data is clocked
into a shift register on the rising edge of a CLOCK
signal. Normally, STROBE is held high, and is only
brought low to initiate a write cycle. The data is writ-
ten MSB ? rst. Refer to the diagram below for timing
requirements.
STROBE
CLOCK
DATA
C
A
MSB
B
D
E
F
LSB - D0
G
SLEEP
H
Serial Port Timing Diagram
A. Minimum Data Setup Time
B. Minimum Data Hold Time
C. Minimum Setup Strobe to Clock rising edge
D. Minimum Clock High Pulse Width
E. Minimum Clock Low Pulse Width
15 ns
10 ns
120 ns
40 ns
40 ns
F. Minimum Setup Clock rising edge to Strobe
G . Minimum Strobe Pulse Width
H. Minimum Sleep to Clock Setup Time
I. Setup “Idle” Release to Output Enable
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
50 ns
120 ns
50 μ s
1 ms
9
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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