Issues with VNQ9080AJTR Quad-Channel high-side driver Output and Input Behavior.

[Divyansh12]

Hello STM Community,

I'm currently working with the VNQ9080AJTR Quad Channel High-Side Driver, and I'm encountering a couple of issues that I hope someone here can help me resolve

1.Output Voltage Regulation: With a constant VCC supply of 12V, the output of the IC is randomly regulated to 7-8V instead of maintaining a stable 12V output. This issue seems to occur intermittently, and I can't pinpoint a specific trigger for when it happens. Has anyone experienced similar behavior? What could be causing the output voltage to drop unexpectedly?

2.Input Pin Voltage: I have connected the input pin (which is supposed to take signals from the microcontroller) to control the driver, but at times, I'm reading 7-8V at this input pin instead of the expected logic-level voltage.

For both issues, I’ve verified my connections and ensured proper grounding. The behavior is random, making troubleshooting difficult.

Datasheet : https://www.st.com/resource/en/datasheet/vnq9080aj.pdf

[MBONA.1]

Dear Divyansh12,

 

 there is something strange on this behavior.

 

To support you we need to have a schematic and more information.

 

Waiting for your feedback.

 

BR

 

 

 

[Divyansh12]

Hello,

Please find the schematic attached below for the IPD.

[stojank]

Hi, I've got same and similar issues with VNQ9080. I get about 3V on outputs, in other case three outputs work well, the fourth is all time on 7V, with input to ground. I hope somebody from ST will help us. 

[Peter BENSCH]

@stojank You can find the answer to your question here.