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I'm not sure if this is the right place to ask this kind of question(mine seems practical as opposed to academic) but here it goes.

The embedded board I am using(Jetson TX1) can be powered using:

  • 4S LiPO(4 cell / 14.8V nominal / 16.8V charged) with 1-2A (or 15W) of continuous current
    or
  • 3S LiPO (11.1V nominal / 12.6 charged / 9V discharged) with 1-2A (or 15W) of continuous current

(from https://devtalk.nvidia.com/default/topic/914529/jetson-tx1/battery-for-jetson-tx1/1)

I'm trying to mount Jetson TX1 on my quadrocopter which has XT30/XT60 ports with the following spec:

  • Output Voltage: 20 - 26.1 V
  • Max Continuous Output Current: 10 A

(from http://wiki.dji.com/en/index.php/Matrice_100-Reserved_Ports_Description)

Now I'm trying to buy a DC-DC step down converter and I'm currently looking at DROK 200143 DC-DC Buck Converter 3.5-30V to 0.8-29V 10A Step-down Volt Adjustable Output Regulator Module Power Supply which has

  • 3.5-30V input
  • 0.8-29V output output
  • 10A Max output current

My concern is the input current. The output current only needs to be 2A but it should take 10A input current.

Is the max input current same as the max output current?

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  • \$\begingroup\$ Just because your source can deliver 10A it doesn't mean your regulator has to draw 10A. If you use the regulator to drop the voltage, then it will draw less current than it puts out. So, for a 2A output it will draw a little less than 2A from the battery. You must match the input voltage range, but current is different. \$\endgroup\$ – JRE Dec 6 '16 at 6:21
  • \$\begingroup\$ 10A max current is the current it can support on that rail. Based on Load actual current varies. Use following eqn Input power * efficiency = Output power to calculate input current. It doesn't require to handle 10A input current, Based on load requirement current varies \$\endgroup\$ – user19579 Dec 6 '16 at 6:22
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That means this converter is capable of giving you max 10A, not that it will use all 10A from the power source, as @JRE stated. So you can use this DC-DC converter. Moreover, you will only need 2A max, so you maybe can find a smaller or cheaper DC-DC converter.

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  • \$\begingroup\$ Ah I see. I found a better one here(amazon.com/dp/B00JUFJ1GA/…). Another quick question: do you by any chance know how i can connect XT30 to this converter, and connect the converter to a DC barrel? \$\endgroup\$ – MoneyBall Dec 6 '16 at 9:07
  • \$\begingroup\$ will the banana plugs(found here amazon.com/HobbyKing-charge-banana-plugs-Booole/dp/B01EE0VEJC/…) fit the input holes on the converter? and can i use this (amazon.com/SIM-NAT-Pigtails-Security-Application/dp/B01GPL8MVG/…) for the output? \$\endgroup\$ – MoneyBall Dec 6 '16 at 9:22
  • \$\begingroup\$ The converter looks fine, but if you're planning to mount it in a quadcopter, you better find the smallest and lightest one (are you sure you need the display?). About the XT30 connectors; I can't help you, I've never used them. \$\endgroup\$ – Adam Calvet Bohl Dec 6 '16 at 9:48
  • \$\begingroup\$ Good point. I'll find a smaller one. Thanks for all the help! \$\endgroup\$ – MoneyBall Dec 6 '16 at 9:49
  • \$\begingroup\$ You're welcome. Only a small advice: I would search for a slightly bigger converter, at least 10% more power (say >2.2A) to be sure. \$\endgroup\$ – Adam Calvet Bohl Dec 6 '16 at 9:52

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