Welcome to KD - Already a member?  [Sign In] | Join Free
Main Product Picture - click to enlarge

Boost/Buck 3-18V 5 Modes 24mm 30W Circuit Board

Our Price: $15.37 free shipping
decrease increase
Tab Arrow Overview
Tab Arrow Buy 3+ and Save ($14.52 ~ $14.88)

  Ship in 1-3 business days   Worldwide Free Shipping on Everything Free World-wide Shipping

This circuit comes with low voltage protection at 5.7V, so please use two or more li-ion for best result.

Input Voltage: 3-18V (recommend use of 2-4pcs 4.2V 18650 or 4-6pcs 3V CR123A)
Output current (single LED): 5A
Output current (3 or 4 XM-L LED wired in serial): 3A
Modes: High - Medium - Low - Strobe - SOS (cycle) (with Memory feature), shut off to cycle to next mode

Low voltage Protection: When using single or two Li-ion batteries, input voltage becomes 5.7V, LED will flash twice per 3 seconds and then turn off after 3 minutes.
Over-heat Protection: When internal temperature becomes too hot, driver will automatically ramp down its brightness, make sure you "heat-sinked" the driver.

LED power output: single LED (8-10W), three or four LED wired in serial (25-30W)
Input requirement: Input current is about 3-3.5A, make sure the wiring and switch is capable of handling this type of high current.

 *When driving 3 or 4 XML (serial) with 1-2 li-ion (serial), this circuit acts as boost circuit. When using 3-4 lion wired in serial, this circuit becomes a buck and temperature regulated circuit.

Battery board measures 26mm
Main driver measures 24mm
Total height measures 17mm

Attention: One piece Circuit Board with 3~4 pieces "Thermally conductive adhesive". To make it better to thermally conductive, please smash the "Thermally conductive adhesive" and filled it between circuit board and body.

To get Volume Discounts,please TICK "Use volume discounts" during checkout.
You will see a bulk rate discount applied at the bottom of the shopping cart.
For higher volume discount rate, please contact us sales@kaidomain.com directly.

Quantity 3+ units 5+ units 10+ units
Rate $14.88 shipped $14.71 shipped $14.52 shipped

When you use bulkrate discount, a flat $1.70 of registered air mail fee will added to your shopping cart to ensure delivery of package.

Reviews Return to top

Ownership verified by KD 2 cell minium :(
Posted by Kajman  on   12/29/2011 10:16:46 AM
Avg.Rating: star star star star


Ready from the box to drive strong setups. Interesting cell protection when using 2 or more. 3.8A current drain on 1 cell, 2.4A by 2 cells when one SST50 connected.


Cell protection does not recognize that 1 cell is connected and then in spite driver works, you can not use it :( Producer should give us way to turn protection off for single cell usage. The driver is quite large :) No possibility to turn disco modes off.


Nice driver, I will try to use it on some 3x xml flashlights and come back.
Ownership verified by KD A good replacement driver
Posted by a7851212  on   10/29/2015 11:22:49 PM
Avg.Rating: star star star star


These are easy to install and fit well into a TR 3XT6 I wanted to upgrade. The current at the tail cap with three XM-L2 s and two cells was 4.25 amps. @ 7.7 volts which works out to 32.77 watts then subtract for driver loss.


Although it says these will run a single LED I wouldn't try it with an XM-L. The output is 12 Volts +/- so I decided not to tempt fate and see if it could tell the difference between 1 LED and 3.


These are a good replacement but not exciting if you want more current.
Discussions Return to top

To post or reply in the forum, Log in or Create an account.

Customer Support

Customer Service

  Newsletter email:


My Account


© 2006 - 2016 Kaidomain.com All rights reserved.

Note: All content included in or made available through any KD Service, such as text, graphics, images, audio clips and data compilations is the property of Kaidomain KD. Stock Price and Availability on KD is for your reference only. Any Information may change or update when you are adding to the cart or the time you receive the order.

Kaidomain KD reserves the right to change information or price at anytime without notice.

Checkout with PayPalGoogle Safe browsing