Why is the power supply of the camera module broken?

Click here for detailed symptoms

• The power IC is used in camera modules manufactured by your company
• Confirmed normal operation in in-house shipping test
• According to the manufacturer report, overvoltage breakdown (EOS) is the cause.
• Use 3 of the same power supply IC on the board
• Failure occurs only in the first stage power supply circuit (generating 5V from 24V)

The IC manufacturer told me that "there is no quality problem because it has a withstand voltage of 30V."
However, since there is a problem only in the power supply circuit of the 24V input part, I suspect that a lot with a weak withstand voltage was delivered.

Just to be sure, I checked the circuit diagram and layout diagram, but there seems to be no particular problem.

It is strange that EOS malfunctions occur even though the circuit diagram and layout diagram recommended by the manufacturer are used as they are. . .

Do you have any other concerns?

Speaking of which, it's a specific customer who's having a problem.

really! ?
Please tell us a little more about them!
Are there any particular applications in which the camera module is used or how it is used?

Hmm. . .
I don't know how to use it, but even with similar power specifications, there are no problems with security cameras.
The problem has only occurred with certain customers who are using the camera for industrial use.

So that's it···. For the customer who is experiencing the problem, is it possible that the camera is installed with a long power line?

Ah! It's certainly a device that could be placed with longer power lines.

Please check how your customers use it.
Since the input capacitor of the camera module is only a ceramic capacitor, EOS failure may occur if the power cable is long.
The countermeasure method is the second part of the column I am writing.Is the culprit long wiring? Please check the contents.

Thank you very much. I'll take a look at it and take action.

This customer actually implemented the countermeasures posted in the column and was able to successfully eliminate the problem.

Causes of power supply overvoltage breakdown (EOS) failure

• long power cable
• Input capacitor is ceramic capacitor only

The point of this time

It is important to design the power supply circuit considering the environment in which the product will be installed.