Narrow down by specifying conditions
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This is Sasaki in charge of power supply dock technology.
Thank you for visiting our power supply column.
This time, I (the author) will be the instructor.
I would like to introduce the questions we received from our customers.
It is important to verify the actual machine, but it is essential to follow the specifications!
Recent devices (especially FPGAs) require multiple power supplies, making power supply design very difficult.
In addition, the power supply sequence is also determined, and recently not only the "startup" sequence but also the "shutdown" sequence has been specified. Is it really bad if I don't protect it?
Yes, power sequencing affects device reliability and must be followed.
Really?
With old devices, failure to follow the sequence could cause latch-up and burnout of the device, but modern devices don't have that problem, do they?
Nevertheless, I am not quite convinced that the power supply sequence must be strictly observed.
Certainly, old devices had visible problems such as burnout, so it was easy to understand the importance of power supply sequencing.
It doesn't burn out these days, but it's very troublesome because there's a problem that you can't see.
For example, what kind of problems do you encounter?
If the power supply sequence is not followed, a large rush current (*1) will flow through the device.
There is a risk of quality degradation due to large currents flowing through the device during the power on-sequence and off-sequence.
Also, a voltage drop occurs when a large rush current flows.
If the power supply voltage drops significantly due to this, the device may be reset and reconfigured, or in the worst case, the device may not boot normally.
I've learned well that power sequencing should not be ignored just because there are no visible problems.
I will keep the power supply sequence and try to make a good quality product.
If you have any additional questions, please contact us from the website at a later date.
I understand. I will ask you another question.
*1: In addition to rush current, there are various names such as inrush current and surge current. All of them have the same meaning, and it is a phenomenon in which a large current flows instantaneously.
The point of this time
Strictly follow the power supply sequence.
If the regulations are not observed, a large rush current may flow and the product quality may deteriorate.
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