A5977和A5979 Microstepping DMOS驱动程序的热插拔测试结果

Introduction

Hot-swapping, disconnecting, or connecting power supply inputs and/or power outputs of an IC while in operation is
不推荐，但在某些应用中是正常的做法。亚博尊贵会员其中一个应用是在纺织机器中亚博尊贵会员，其中电动机和电源引线可以连接和断开，同时电流供应到两个电动机绕组。在本申请中，IC电机输出和
电源通过开关继电器布置连接到电机驱动器PC板（6个引脚）。

This report outlines hot-swap test results forA5977.和A5979.stepper motor drivers. To duplicate the hot-swap conditions, we have selected an IC motor supply voltage (VBB) of 24 V and motor current of 1.5 A per winding for our tests. Testing was performed with different microstepping resolutions and with the following hot-swap methods:

两套电机和电源之间的热插拔
热插拔单个电机从在线到离线
两套电机与电机驱动器的热插拔总是供电
热插拔单个电机，带电机驱动器始终供电
步进电机单相位阶段的故障条件
使用步进电机端子开关电源开关，始终连接

Objective

To evaluate the hot-swapping performance of the A5977 and A5979 microstepping DMOS driver ICs.

实验装置

图1显示了用于热插拔步进电机驱动器的测试连接（A5977 / A5979）。实验室的实验测试原型已经在实验室中开发，如图2所示。在该设置中，6极，双掷开关用于电机和电源之间的热插拔。如图1所示，每个100 W的两个电源和两个步进电机连接在开关的六极上。使用的评估板是标准A5977 / 79插座板。

Figure 3 shows the front and rear view images of the 6-pole, double-throw switch used for development of the hot-swap testing setup.

**Figure 1: Test connection for hot-swap testing of stepper motor driver**

测量参数

Figure 4 shows the typical setup for the measurement of various parameters during hot-swap testing. VDD and IDD represents the logic supply voltage and current, respectively.

**Figure 4: Measurement setup of various parameters**

A5977 / A5979 Microstepping Motor驱动器IC的热插拔测试结果

以下部分在各种热插拔条件下介绍了A5977 / A5979步进电机驱动器电源IC的评估。热插拔测试的各种条件概述如下：

两套电机和电源之间的热插拔。
热插拔单个电机从在线到离线.
两组电机与电动机驱动器的热插拔始终供电。
热插拔单个电机，带电机驱动器总是供电。
步进电机单相位阶段的故障条件。
使用步进电机端子开关电源开关，始终连接.

The stepper motor driver has been tested multiple times for the above mentioned conditions. Following are the results observed at these conditions.

两套电机和电源之间的热插拔

This case is the most basic case of hot-swapping in which the stepper motor driver is hot-swapped between the two sets of a motor and power supply combination. A 6-pole, double-throw switch is used for hot-swapping the motor driver between the two stepper motors and power supply sets. Figure 5 (a) through (d) shows the results observed during the full-, half-, quarter-, and eighth-step (A5977) modes, respectively. This test has been carried out on 20 ICs with a minimum of 100 hot-swaps. The driver operated normally with no change in performance after each hot-swap.

图5：A5977 / A5979的性能在（a）全步（b）半步，（c）四分之一步骤和（d）八步（a5977）模式下，显示出在热交换期间的步进电机驱动器直流母线电压（VBB）（黄色），相电压（vPhase）（粉红色），步进电机1相电流（IPHASE1）（蓝色）和步进电机2相电流（IPHASE2）（绿色）。

HOT-SWAPPING A SINGLE MOTOR FROM ON-LINE TO OFF-LINE

In this case, a single stepper motor and power supply set is connected to the motor driver; therefore, all the six lines, including VBB, GND, OUT1A, OUT1B, OUT2A, and OUT2B are connected and disconnected during hot-swapping. Figure 6 (a) through (d) shows the results observed during the full-, half-, quarter-, and eighth-step (A5977) modes, respectively. This test has been carried out on 20 ICs with a minimum of 100 hot-swaps. The driver operated normally with no change in performance after each hot-swap.

图6：A5977 / A5979步进电机驱动器的性能在热插拔（a）全步，（b）半步，（c）四分之一步骤和（d）八步（a5977）模式，显示直流母线电压（VBB）（黄色），相电压（vPhase）（粉红色），步进电机1相电流（IPHASE1）（蓝色）和步进电机2相电流（IPHASE2）（绿色）。

两套电机与电机驱动器的热插拔总是供电

In this case, two stepper motors are hot-swapped while the power supply is always connected to the motor driver. Therefore, only four lines, including OUT1A, OUT1B, OUT2A, and OUT2B, are connected and disconnected during hot-swapping. Figure 7 (a) through (d) shows the results observed during the full-, half-,
四分之一，第八步（A5977）模式。该测试已在20个ICS上进行，最少100个热插拔。驾驶员通常在每次热插拔后的性能没有变化。

Figure 7: Performance of A5977/A5979 stepper motor drivers during hot-swapping at (a) full-step, (b) half-step, (c) quarter- step, and (d) eighth-step (A5977) modes, showing the DC bus voltage (VBB) (yellow), phase voltage (VPHASE) (pink), stepper motor 1 phase current (IPHASE1) (blue), and stepper motor 2 phase current (IPHASE2) (green).

热插拔单个电机，带电机驱动器始终供电

在这种情况下，在电源始终连接到电动机驱动器时，单步高步进电机热插拔。因此，在热交换期间只连接四条线，包括Out1a，Out1b，Out2a和Out2b。图8（a）至（d）显示了在完整，半，季度和第八步（A5977）模式期间观察到的结果。该测试已经在20个ICS上进行，最少100个Hotswaps进行。驾驶员通常在每次热插拔后的性能没有变化。

图8：A5977 / A5979步进电机驱动器的性能在热插拔（a）全步（b）的半步，（c）四分之一步骤和（d）第八步（a5977）模式，显示直流母线电压（VBB）（黄色），相电压（vPhase）（粉红色）和步进电机相电流（Iphase1和Iphase2）（蓝色和绿色）。

步进电机单相位阶段的故障条件

在这种情况下，步进电机的一个相连接并断开电源，电源总是连接到电动机驱动器。因此，在这种情况下，在热交换期间连接和断开来自四条线中的任何一个的单线，即OUT1A，OUT1B，OUT2A和OUT2B。图9（a）至（d）显示了在全部，半，四分之一和第八步（A5977）模式期间观察到的结果。该测试已在20个ICS上进行，最少100个热插拔。驾驶员通常在每次热插拔后的性能没有变化。

图9：A5977 / A5979的性能在（a）全步（b）半步，（c）四分之一步骤和（d）八步（a5977）模式，显示直流母线电压（VBB）（黄色），相电压（vPhase）（粉红色）和步进电机相电流（Iphase1和Iphase2）（蓝色和绿色）。

步进电机单相位阶段的故障条件

在这种情况下，步进电机的一个相连接并断开电源，电源总是连接到电动机驱动器。因此，在这种情况下，在热交换期间连接和断开来自四条线中的任何一个的单线，即OUT1A，OUT1B，OUT2A和OUT2B。图10（a）至（d）显示了在全部，半，四分之一和第八步（A5977）模式期间观察到的结果。该测试已在20个ICS上进行，最少100个热插拔。驾驶员通常在每次热插拔后的性能没有变化。

Figure 10: Performance of A5977/A5979 stepper motor drivers during hot-swapping at (a) full-step, (b) half-step, (c) quarter- step, and (d) eighth-step (A5977) modes, showing the DC bus voltage (VBB) (yellow), phase voltage (VPHASE) (pink), and stepper motor phase currents (IPHASE1 and IPHASE2) (blue and green). — Figure 10: Performance of A5977/A5979 stepper motor drivers during hot-swapping at (a) full-step, (b) half-step, (c) quarter-
步骤，（d）第八步（A5977）模式，显示直流母线电压（VBB）（黄色），相电压（VPHASE）（粉红色），
和步进电机相电流（iphase1和iphase2）（蓝色和绿色）。

CONCLUSION

本报告中已进行A5977和A5979步进电机驱动程序的严格热插拔测试。所有6个提到的热插拔条件（6条件×20 IC×100次）每个6个都测试了至少20个IC，每个IC都是100次测试的100次=每次=总数12000个事件）。

This hot-swap testing has also been performed on a single device for four different stepping modes, i.e. full-step, half-step, quarter-step, and eighth-step (A5977) modes. The driver operated normally with no change in performance after each hot-swap.

我们可以得出结论，A5977和A5979在本报告中提供的条件下具有强大的热插拔性能。