I am building circuit to control some LED strips. I will be using APA102 strips. https://cdn-shop.adafruit.com/datasheets/APA102.pdf
I am using an Arduino to control the strips. The strips will have approximately 100 rgb LEDs, and so the maximum current is 60mA x 100 = 6A. They will normally be at near maximum brightness, including when turned on.
I have been reading a fair bit about inrush current. I am strictly amateur, so please excuse my ignorance and poor terminology. My impression so far is that from a cold start, a 6A circuit can have a significant inrush current, especially if I include a 1000uF smoothing capacitor across the power supply, as advised by the LED suppliers, to protect the LEDs:
https://learn.adafruit.com/adafruit-neopixel-uberguide/power : "Before connecting a NeoPixel strip to ANY source of power, we very strongly recommend adding a large capacitor (1000 µF, 6.3V or higher) across the + and – terminals. This prevents the initial onrush of current from damaging the pixels."
https://github.com/ManiacalLabs/AllPixel/wiki/Installing-Optional-Components#21mm-dc-barrel-jack : "1000uF Capacitor - This capacitor sits over the strip V+ and Ground lines and helps smooth out the power for the LEDs. Some strips are more sensitive to power rail conditions and recommend such a capacitor be installed for reliable use. Regardless of the strip type, there isn't any harm in installing this capacitor."
https://github.com/ManiacalLabs/AllPixel/wiki/Assembling-the-PowerTap also suggests a 1000uF cap.
From my reading, the large cap will result in an even larger inrush current, exacerbating the problem. Is this correct? Is the cap really necessary?
How can I measure the inrush current?
Can this inrush damage the PSU?
How can I deal with the inrush current. I am thinking of using a NTC thermistor, specifically the NTC 5D-15 https://www.icbanq.com/data/ICBShop/board/00000000-NTC-POWER.pdf
Are there better ways to deal with the inrush current?
Also, I would like to use a mechanical switch to turn the circuit on and off. Should this go before or after the cap and thermister?
I know this is a lot of questions, but the more I read about this, the more confused I get. Thank you for your help in advance.