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I am fairly inexperienced with electronics so please bear with me.

I have an Arduino Nano 33 IoT being powered by a battery pack which at 100% outputs 40.2V and at 0% outputs 36.5V Since the Max Vin Voltage the Arduino supports is 21V, I am using a LM2596 to reduce the input voltage from the battery(40V) to the Arduino(10V)

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When I was testing the LM2596 I noticed some sparks came out, then when I started searching about it I figured it out that is was inrush current probably caused by the capacitors being charged? Correct me if I am wrong. Then I searched on how could I prevent my circuit from frying up, and couple solutions came up with resistors or NTCs. But the main issue now is, which resistor to chose from(Ohm wise)? or the NTC Thermistor? What's the math and the calculations behind it?

Thanks in advance!

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  • \$\begingroup\$ Data sheet link to the LM2596 (the actual part/module you bought) please. Did the device/module/part die when you saw sparks and, where did the sparks erupt from? \$\endgroup\$ – Andy aka Nov 23 '20 at 16:25
  • \$\begingroup\$ i believe its this one ti.com/lit/ds/symlink/… the part didn't die, but i rather have some sort of inrush prevention circuit than having none, since i dont want my circuit to die! \$\endgroup\$ – Aquele Carry Nov 23 '20 at 16:39
  • \$\begingroup\$ What was the schematic you used? \$\endgroup\$ – Andy aka Nov 23 '20 at 16:50
  • \$\begingroup\$ Did you use an LM2596 module, or did you build the circuit around in yourself? If a module, do you have specs or schematic? What size capacitor does it have on its input? \$\endgroup\$ – ocrdu Nov 23 '20 at 17:06
  • \$\begingroup\$ the Power Source + and - are connected to the LM2596 IN+ and IN-, and the Arduino Vin is connected to the LM2596 OUT+ and grnd is connected to LM2596 OUT- \$\endgroup\$ – Aquele Carry Nov 23 '20 at 17:08

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