- 您现在的位置：买卖IC网 > PDF目录1773 > A4979GLPTR-T (Allegro Microsystems Inc)IC MOTOR DRVR MICRO STEP 28TSSOP PDF资料下载
参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/44页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR MICRO STEP 28TSSOP |
| 特色产品： | A4979 Series |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 评估套件： | 可供 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1463-6 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页当前第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页
A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
SCK Serial interface clock. Data is latched in from SDI on the
rising edge of the SCK clock signal. There must be 16 rising
edges per write and SCK must be held high when STRn changes.
STRn Serial data strobe and serial access enable. When STRn
is high any activity on SCK or SDI is ignored, and SDO is high
impedance allowing multiple SDI slaves to have common SDI,
SCK, and SDO connections.
DIAG Diagnostic output. Function selected via the serial inter-
face, setting Configuration Register 1. Default is Fault output.
OSC With bit 13 in Configuration Register 1 set to 0, either con-
nect this pin to AGND to use the internal oscillator running at the
default frequency of 4 MHz, or connect a resistor to VDD to set
the internal oscillator frequency. ( The approximate frequency is
calculated from:
f OSC = 10 000 / (48 R OSC – 20)
where f OSC is the internal oscillator frequency in MHz, and R OSC
is the value, in k Ω of the resistor between OSC and VDD.)
If bit 13 in Configuration Register 1 is set to 1, then OSC is the
input for an external system clock, which must have a frequency
between 3 and 5 MHz. In this mode a watchdog is provided to
detect loss of the system clock. If the OSC pin remains high or
low for more than the watchdog time, t WD , 1 μ s typical, then the
Fault Register flag (bit 15 in the diagnostic registers) is set and
the outputs are disabled until the clock restarts.
Driving a Stepper Motor
A two-phase stepper motor is made to rotate by sequencing the
relative currents in each phase. In its simplest form, each phase
is simply fully energized in turn by applying a voltage to the
winding. For more precise control of the motor torque through
temperature and voltage ranges, current control is required. For
efficiency this is usually accomplished using pulse width modula-
tion (PWM) techniques. In addition current control also allows
the relative current in each phase to be controlled, providing more
precise control over the motor movement and hence improve-
ments in torque ripple and mechanical noise. Further details of
stepper motor control are provided in Appendix A.
For bipolar stepper motors the current direction is significant,
so the voltage applied to each phase must be reversible. This
requires the use of a full bridge (also known as an H-bridge)
which can switch each phase connection to supply or to ground.
Phase Current Control
In the A4979, current to each phase of the two-phase bipolar
stepper motor is controlled through a low impedance N-channel
DMOS full bridge. This allows efficient and precise control of
the phase current using PWM switching. The full-bridge con-
figuration provides full control over the current direction during
the PWM on-time, and over the current decay mode during the
PWM off-time. Due to the flexibility of the A4979 these control
techniques can be completely transparent to the user or can be
partially- or fully-programmed through the serial interface.
Each leg (high-side, low-side pair) of a bridge is protected from
shoot-through by a fixed dead time. This is the time between
switching off one FET and switching on the complementary FET.
Cross-conduction is prevented by lock-out logic in each driver pair.
The phase currents and in particular the relative phase currents
are defined in the Phase Current table (table 7). This table defines
the two phase currents at each microstep position. For each of the
two phases, the currents are measured using a sense resistor, R S ,
with voltage feedback to the respective SENSx pin. The target
current level is defined by the voltage from the digital-to-analog
converter (DAC) for that phase. The sense voltage is amplified by
a fixed gain and compared to the output of the DAC.
There are two types of maximum current : the absolute maximum,
I SMAX , the maximum possible current defined by the sense resis-
tor and the reference input; and the phase maximum, I PMAX , the
maximum current delivered to a motor phase.
The absolute maximum current, I SMAX , is defined as:
I SMAX = V REF / (16 × R S )
where V REF is the voltage at the REF pin, and R S is the sense
resistor value.
The phase maximum, I PMAX , is the 100% reference level for the
phase current table and may be a fraction of the absolute maxi-
mum current, I SMAX , depending on the value of the MXI0 and
MXI1 bits in Configuration Register 0.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| A4980KLPTR-T | IC STEPPER DVR PROGR 28-TSSOP |
| A4982SLPTR-T | IC DRIVER MICROSTEPPING 24-TSSOP |
| A4983SETTR-T | IC MOTOR DRIVER MICROSTEP 28-QFN |
| A4984SLPTR-T | IC STEPPER MOTOR DRIVER 24TSSOP |
| A4985SETTR-T | IC STEPPER MOTOR DRIVER 32QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A4980 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4980 is a flexible microstepping motor driver with built-in translator for easy operation. |
| A4980KLP-T | 制造商:Allegro MicroSystems LLC 功能描述: |
| A4980KLPTR-T | 功能描述:IC STEPPER DVR PROGR 28-TSSOP 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 |
| A4982 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
| A4982_V4 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
发布紧急采购，3分钟左右您将得到回复。