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参数资料
| 型号： | A3977KLP |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR PWM DUAL 28TSSOP |
| 标准包装： | 50 |
| 应用： | 步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±2.5A |
| 电压 - 负载： | 8 V ~ 35 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°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： | 管件 |
A3977
Microstepping DMOS Driver with Translator
Functional Description
Device Operation. The A3977 is a complete microstep-
ping motor driver with built in translator for easy operation
with minimal control lines. It is designed to operate bipolar
stepper motors in full-, half-, quarter- and eighth-step
modes. The current in each of the two output full-bridges,
all N-channel DMOS, is regulated with ? xed off-time
pulse-width modulated (PWM) control circuitry. The full-
bridge current at each step is set by the value of an external
current sense resistor (R S ), a reference voltage (V REF ), and
the DACs output voltage controlled by the output of the
translator.
At power up, or reset, the translator sets the DACs
and phase current polarity to initial home state (see ? gures
for home-state conditions), and sets the current regula-
tor for both phases to mixed-decay mode. When a step
command signal occurs on the STEP input the translator
automatically sequences the DACs to the next level (see
table 2 for the current level sequence and current polarity).
The microstep resolution is set by inputs MS 1 and MS 2
as shown in table 1. If the new DAC output level is lower
than the previous level the decay mode for that full-bridge
will be set by the PFD input (fast, slow, or mixed decay).
If the new DAC level is higher or equal to the previous
level then the decay mode for that full-bridge will be slow
decay. This automatic current-decay selection will improve
microstepping performance by reducing the distortion of
the current waveform due to the motor BEMF.
Reset Input (RESET). The RESET input (active low)
sets the translator to a prede ? ned home state (see ? gures
for home state conditions) and turns off all of the DMOS
outputs. The HOME output goes low and all STEP inputs
are ignored until the RESET input goes high.
Home Output (HOME). The HOME output is a logic
output indicator of the initial state of the translator. At
power up the translator is reset to the home state (see ? g-
ures for home state conditions).
Step Input (STEP). A low-to-high transition on the
STEP input sequences the translator and advances the
motor one increment. The translator controls the input to
the DACs and the direction of current ? ow in each wind-
ing. The size of the increment is determined by the state of
inputs MS 1 and MS 2 (see table 1).
Microstep Select (MS 1 and MS 2 ). Input terminals
MS1 and MS 2 select the microstepping format per
table 1. Changes to these inputs do not take effect until the
STEP command (see ? gure).
Direction Input (DIR). The state of the DIRECTION
input will determine the direction of rotation of the motor.
Internal PWM Current Control. Each full-bridge is
controlled by a ? xed off-time PWM current-control cir-
cuit that limits the load current to a desired value (I TRIP ).
Initially, a diagonal pair of source and sink DMOS outputs
are enabled and current ? ows through the motor winding
and R S . When the voltage across the current-sense resistor
equals the DAC output voltage, the current-sense compara-
tor resets the PWM latch, which turns off the source driver
(slow-decay mode) or the sink and source drivers (fast- or
mixed-decay modes).
The maximum value of current limiting is set by the
selection of R S and the voltage at the V REF input with a
transconductance function approximated by:
I TRIP max = V REF /8R S
The DAC output reduces the V REF output to the cur-
rent-sense comparator in precise steps (see table 2 for %
I TRIP max at each step).
I TRIP = (% I TRIP max/100) x I TRIP max
It is critical to ensure that the maximum rating (0.5 V)
on the SENSE terminal is not exceeded. For full-step
mode, V REF can be applied up to the maximum rating of
V DD , because the peak sense value is 0.707 x V REF /8. In all
other modes V REF should not exceed 4 V.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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| A3977KLP-T | 功能描述:IC MOTOR DRIVER PWM DUAL 28-TSSO 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3977KLPTR | 功能描述:IC MOTOR DRVR PWM DUAL 28TSSOP RoHS:否 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3977KLPTR-T | 功能描述:IC MOTOR DRVR PWM DUAL 28TSSOP 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3977SED | 功能描述:IC MOTOR DRIVER PWM DUAL 44PLCC RoHS:否 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3977SED-T | 功能描述:IC MOTOR DRIVER PWM DUAL 44-PLCC 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
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