# CEO 7271 model XL4015 step down converter

**URL:** <https://forum.core-electronics.com.au/t/ceo-7271-model-xl4015-step-down-converter/24431>\
**Category:** Product Questions\
**Created:** [14 September 2026 01:34 UTC](https://forum.core-electronics.com.au/t/ceo-7271-model-xl4015-step-down-converter/24431 "2026-09-14T01:34:02Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![peter23346](https://avatars.discourse-cdn.com/v4/letter/p/d26b3c/32.png) [@peter23346](https://forum.core-electronics.com.au/u/peter23346)\
**Post date:** [14 September 2026 01:34 UTC](https://forum.core-electronics.com.au/t/ceo-7271-model-xl4015-step-down-converter/24431/1 "2026-09-14T01:34:02Z")

</div>

Hi guys, I have this item purchased from yourselves. I see that the maximum current from this is 5 amps.  
I am using it with a servo motor from a 12v battery to a 7v output. The problem is it is not moving a servo. I think the most likely cause is the current adjustment knob may be restricting the current output. I should have gotten a unit without the current adjustment as I see these are available.  
Is there a way to tell what the current adjustment knob is set to? I guess the maximum setting would be 5 amps. How do I get this? Do I rotate clockwise or anticlockwise until I come to a stop on the rotation?  
I am using an Arduino nano board for programming. Thanks.

---

<div class="post-metadata">

**Author:** ![Jane](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/jane/32/12622_2.png) [@Jane](https://forum.core-electronics.com.au/u/Jane)\
**Post date:** [14 September 2026 06:20 UTC](https://forum.core-electronics.com.au/t/ceo-7271-model-xl4015-step-down-converter/24431/2 "2026-09-14T06:20:54Z")

</div>

Hey there, @peter23346,

The current adjustment on the DC-DC Adjustable Step-down Module 5A 75W (SKU: CE07271) only sets an upper limit, it doesn’t force 5 A into the servo. The servo only draws the current it needs, provided the converter, battery and wiring can supply it.

Could you tell us a little bit more about the servo you’re using you’re here, especially if you can tell us its exact model or give us a datasheet. I would want to check its voltage and stall current.

Also check that:

- Nano GND, converter OUT− and servo ground are connected together.
- The servo is powered directly from the converter, not through the Nano.
- The converter remains near 7 V while movement is commanded.

If the voltage collapses under load, that would point towards current limiting, inadequate input power/wiring, or the servo demanding more than the converter can supply.