Electrical – Max input current of DC DC converter

dc/dc converter

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?

Best Answer

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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