DRV8842输出与datasheet不符

user6071506

Prodigy 10 points

Other Parts Discussed in Thread: DRV8842

最近使用H桥驱动DRV8842，原理图如下：

使用DC12V供电后，利用FPGA生成低频PWM，幅值3.3V。当IN1恒等于高电平，IN2恒等于低电平时，输出如下：

此时有毛刺现象，当IN1为PWM波形、IN2接地时，输出波形却与数据手册中逻辑不符：

此时输出的波形OUT1却比OUT2低，而且输出电压也只有5V左右。交换IN1、IN2状态，即IN1接地，IN2为PWM方波，输出波形不变。请问各位工程师们这是什么原因呢？

5 年多前

0 Annie Liu 5 年多前

TI__Mastermind 33350 points

关于您的问题，已向国外产品工程师咨询，一旦得到回复，会尽快回复您。

您也可以再此链接中查看进展：

DRV8842: The output of DRV8842 does not match the datasheet - Motor drivers forum - Motor drivers - TI...

e2e.ti.com

Part Number: DRV8842 Hi Team, The customer recently used the H-bridge to drive DRV8842, the schematic diagram is as follows: After using DC12V power supply

0 Annie Liu 5 年多前回复 Annie Liu

TI__Mastermind 33350 points

为了更好分析您的问题，请您提供以下信息：
What is the voltage on VM? A scope capture would be helpful to see if the voltage is collapsing.
What is the value of the sense resistor?
What are the other inputs IN4 through IN0?
Is nFAULT asserting? A scope capture zoomed in to 10ms/div would be helpful.

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DRV8842输出与datasheet不符

DRV8842: The output of DRV8842 does not match the datasheet - Motor drivers forum - Motor drivers - TI...