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| 型号： | A4983SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER MICROSTEP 28-QFN |
| 标准包装： | 1 |
| 应用： | 步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±2A |
| 电压 - 负载： | 8 V ~ 35 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN/MLP 裸露焊盘（5x5） |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1194-6 |
A4983
DMOS Microstepping Driver with Translator
Functional Description
Device Operation. The A4983 is a complete microstepping Microstep Select (MS1, MS2, and MS3). Selects the
motor driver with a built-in translator for easy operation with
minimal control lines. It is designed to operate bipolar step-
per motors in full-, half-, quarter-, eighth-, and sixteenth-step
modes. The currents in each of the two output full-bridges and
all of the N-channel DMOS FETs are regulated with fixed off-
time PWM (pulse width modulated) control circuitry. At each
step, the current for each full-bridge is set by the value of its
external current-sense resistor (R S1 and R S2 ), a reference volt-
age (V REF ), and the output voltage of its DAC (which in turn is
controlled by the output of the translator).
At power-on or reset, the translator sets the DACs and the phase
current polarity to the initial Home state (shown in figures 2
through 6), and the current regulator to Mixed Decay Mode for
both phases. When a step command signal occurs on the STEP
input, the translator automatically sequences the DACs to the
next level and current polarity. (See table 2 for the current-level
sequence.) The microstep resolution is set by the combined
effect of inputs MS1, MS2, and MS3 , as shown in table 1.
When stepping, if the new output levels of the DACs are lower
than their previous output levels, then the decay mode for the
active full-bridge is set to Mixed. If the new output levels of
the DACs are higher than or equal to their previous levels, then
the decay mode for the active full-bridge is set to Slow. This
automatic current decay selection improves microstepping
performance by reducing the distortion of the current waveform
that results from the back EMF of the motor.
If the logic circuits are pulled up to VDD, it is good practice to
use a high value pull-up resistor in order to limit current to the
logic inputs, should an overvoltage event occur. Logic inputs
include: MSx, SLEEP, DIR, ENABLE, RESET, and STEP.
microstepping format, as shown in table 1. MS2 and MS3 have a
100 k Ω pull-down resistance. Any changes made to these inputs
do not take effect until the next STEP rising edge.
If the MSx pins are pulled up to V DD , it is good practice to use a
high value pull-up resistor in order to limit current to these pins,
should an overvoltage event occur.
Direction Input (DIR). This determines the direction of
rotation of the motor. When low, the direction will be clockwise
and when high, counterclockwise. Changes to this input do not
take effect until the next STEP rising edge.
Internal PWM Current Control. Each full-bridge is
controlled by a fixed off-time PWM current control circuit
that limits the load current to a desired value, I TRIP . Initially, a
diagonal pair of source and sink FET outputs are enabled and
current flows through the motor winding and the current sense
resistor, R S x . When the voltage across R S x equals the DAC out-
put voltage, the current sense comparator resets the PWM latch.
The latch then turns off either the source FETs (when in Slow
Decay Mode) or the sink and source FETs (when in Mixed
Decay Mode).
The maximum value of current limiting is set by the selection
of R S x and the voltage at the VREF pin. The transconductance
function is approximated by the maximum value of current
limiting, I TripMAX (A), which is set by
RESET Input (RESET). The RESET input sets the trans-
lator to a predefined Home state (shown in figures 2 through
I TripMAX = V REF / ( 8
? R S )
6), and turns off all of the FET outputs. All STEP inputs are
ignored until the RESET input is set to high.
Step Input (STEP) . A low-to-high transition on the STEP
input sequences the translator and advances the motor one
where R S is the resistance of the sense resistor ( Ω ) and V REF is
the input voltage on the REF pin (V).
The DAC output reduces the V REF output to the current sense
comparator in precise steps, such that
increment. The translator controls the input to the DACs and
the direction of current flow in each winding. The size of the
increment is determined by the combined state of inputs MS1,
I trip = (%I TripMAX / 100)
× I TripMAX
MS2, and MS3.
(See table 2 for %I TripMAX at each step.)
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
7
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| A4984 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
| A4984_12 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
| A4984SESTR-T | 功能描述:IC STEPPER MOTOR DRIVER 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| A4984SETTR-T | 功能描述:IC STEPPER MOTOR DRIVER 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| A4984SLPTR-T | 功能描述:IC STEPPER MOTOR DRIVER 24TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
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