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#643 XKT-511 Wireless LED Module

Investigating a wireless LED power module based on the XKT-511 chip.



I’ve seen a few wireless LED power modules for sale so decided to pick one up to find out how they have been designed. I picked a DC Remote Micro Receiver Wireless Power Supply Module wireless power supply coil module that uses the XKT-511 chip on the transmitter end and came with 3 LED modules.


After examining the module, it is quite straight-forward: the XKT-511 chip is fully integrated ASIC used to monitor and control the oscillation on the transmitting coil. It seems to only require 4 additional components:

  • two capacitors (input and output side)
  • two resistors forming a voltage divider for feedback control

The XKT-511 appears to be the latest generation of wireless power control technology from 深圳芯科泰半导体有限公司 Shenzhen Coretech Semiconductor Co., Ltd.. While they haven’t published the datasheet on their website, they have excellent customer service and provided me the full specs in response to an email.


Module Specs

From the aliexpress vendor page:

The combined kit (regulator, coil and LEDs) is designated the XKT515-09. The chip on the module is marked XKT-511.

The main parameters:

  • Transmitting voltage: 12V
  • The transmitting coil: 75mm*1mm
  • The receiving coil: 14.5mm
  • Sending and receiving distance: 45mm

They also offer additional LED modules.



The main problem I ran into is that while the XKT-511 chip is available for sale, I wasn’t able to find product information or a datasheet. I was able to find the XKT-511 chips for sale in various places such as this listing on taobao.

I figured it was produced by 深圳芯科泰半导体有限公司 Shenzhen Coretech Semiconductor Co., Ltd. who produce similar chips like the XKT-510. Although their website does not list it, I was pleasantly surprised when a simple email to them produced a quick reply with a full set of datasheet. Excellent service! They are in Chinese of course, but that is my problem;-)

Selected extracts from the datasheet:


  • Small size,Packaged as SOP-8
  • High working frequency
  • High integration,Few peripheral devices
  • High output power
  • Wide range of applications
  • Control function can be designed freely
  • Under special design,It can control the working state of the receiving part
  • working voltage :DC 3.3~18V
  • working frequency :1KHz~3.5MHz
  • The coil can be printed PCB Board
  • The optimum state of quiescent current can be designed to be lower than 5mA。

SOP8 Pin Configuration

Pin Label Function
1 R Frequency Modification Resistor
2 R Frequency Modification Resistor/Voltage Monitor Resistor
3 Drive GND Digital drive low voltage power ground
4 Load GND Load ground (for function expansion use)
5 VIN Load source
6 TEST Working frequency test
7 VDD Power supply (0-18V)
8 N/F Control terminal, set high to work, set low to close output, can access custom control signals

Example Circuit 1

This example from the datasheet is I think identical to the circuit used in the XKT515-09 package I have.

Notes on the circuit:

  • designed for 5V power supply
  • The emission quiescent current is 60mA±10mA, the output power of this circuit is relatively large, and the coil area and distance determine the actual output power.
  • Transmitting circuit stability test method:
    • power on the transmitting part, record the static current parameters, normally it should be 60mA±20mA (the maximum limit value is not more than 100mA).
    • If the current deviation is not large, you can make fine adjustments by adjusting the number of coil turns.
    • PS: If you are worried about the high temperature after the transmitter chip is damaged, you can string a resettable fuse in the power supply part as a short circuit protection.


Similar Products

The XKT-511 information is not widely available on the internet as yet. A search will likely yield results for the following chips. Be careful not to get confused - these chips are similar in function but quite different in the particulars:

  • XKT-412 - much older product also for wireless power transmission, usually paired with T5336 chip and many external passives. Circuit and datasheet widely available. appears to be the 1st generation product before a 2nd generation of XKT-5xx chips.
  • XKT-510 - appears to be a very similar, perhaps immediate precursor. Requires more external components and has a very different pinout than the XKT-511.
  • XKT-515 - allegedly similar to the XKT-511, but I haven’t seen the datasheet.
  • T3168 / XKT-3168 is a general-purpose receiving integrated circuit for wireless charging. It could be used on the receiving end of the XKT-511 transmitter.
  • XKT-R2 - appears to be the big broether of the XKT-511. DEsigned for high-voltage/high-current charging.


Here is my rough redrawing of the XKT-511 transmitter module. Note:

  • I haven’t measured the values of C1, C2; I am assuming they follow the example circuit from the datasheet
  • R2 measures about 75kΩ in-circuit, which matches the example circuit from the datasheet. The part appears to be labelled “098” (900MΩ?!!) but that doesn’t seem right.



Credits and References

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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.