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I think that there are many cases where it is difficult to confirm reproducibility during trial evaluation before mass production or when a system abnormality caused by a power supply circuit occurs in the market.
Power failure
I think that it is common for the designed circuit to include a mechanism to monitor the power supply circuit and raise an alert when there is a system or power failure.
I think it's very good to monitor the power supply circuit, but when a problem actually occurs, it's very difficult to see which power supply caused the problem.
In such a case, it is very convenient to be able to record a log when an error occurs. This time, I would like to introduce a solution for recording logs.
If the power supply circuit is damaged by overvoltage damage
If a power supply circuit (IC or module) has an abnormal output due to overvoltage breakdown (EOS: Electrical Over Stress), you can easily identify the problem circuit by checking it with a tester. In some cases, it may be damaged by burning and can be visually confirmed (see Fig. 1).
If it occurs frequently, there is a high possibility that there is a problem with the usage of the power supply IC or module, so the quickest way is to check the usage.
If you want to know how to check and examples of problems, we recommend that you attend the power supply problem example seminar.
What about power supply circuit failures other than overvoltage breakdown?
For power supply circuit abnormalities other than overvoltage, it is likely that the power supply circuit is operating normally even after checking the defective board.
In such cases, the cause is often a malfunction related to the power supply circuit or ground wiring pattern.
Even if we try to reproduce problems related to the power supply circuit other than overvoltage breakdown, even if we perform long-term operation verification, they often fail to reproduce.
Solution for logging power circuit anomalies
Analog Devices has a product called Power System Management (PSM).
The LTC2977 PSM product can be connected to a DC/DC converter as shown in Figure 2 to adjust the voltage accuracy to within ±0.5% and control the power supply sequence.
The power supply voltage accuracy can be controlled with high precision, and the power sequence can be set by changing the built-in register settings with the GUI, so it is very compatible with boards equipped with FPGAs.
Another characteristic feature is the ability to detect abnormalities in the power supply circuit.
Abnormalities in the power supply circuit can be detected and logged.
PSM is capable of detecting power failure with a 10usec high-speed comparator for Over Voltage / Under Voltage / Over Current conditions.
Abnormalities in the power supply circuit detected by this high-speed comparator are automatically logged in the EEPROM inside the PSM. This recorded log will be useful if the system is recalled from the market due to a power circuit failure.
Normally, it is difficult to reproduce abnormal conditions, and it is also difficult to confirm which power supply circuit caused the problem. However, if the board is equipped with PSM, it is possible to read the error log using a free tool dedicated to PSM (Fig. 3).
By checking this log, it is possible to check the date and time when an error occurred, the monitored voltage value, and the details of the error. This makes it possible to quickly create a report on a market defect and report it internally or to the customer.
Demonstration video of PSM (Power System Management)
This is a demonstration video of Analog Devices' product PSM (Power System Management), which can record system abnormalities caused by power supply circuits, and also has voltage correction and sequence control functions. Please take a look.
At the end
This article introduced a solution for logging power circuit faults using the PSM product LTC2977. If you have any questions about the product, please contact us from here.
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