FET Driver DIY Parts Kit - MTN-10DD/11DD/12DD/slDD - 10mm / 11mm / 12mm

This kit contains all of the parts, except for the PCB itself, that you need to assemble your own tiny single-sided LFPAK33 based MTN-10DD, MTN-11DD, MTN-12DD, or MTN-slDD (specifically for twisty, but useful for some clicky as well) FET driver.

The low voltage monitoring is programmed by default for a single lithium ion cell, with an approximate ramp down of 3.0v, and a cut off of 2.8v (no cut off with guppydrv firmware; only ramp down). 

Each Kit Includes:

• Low-Resistance N-Channel LFPAK33 MOSFET
• Pre-Programmed attiny13a-MMU MCU 
• 10uF 0603 X5R MLCC Ceramic Capacitor
• 1uF 0603 X7R Ceramic Capacitor "Off-Time"
• 4.7k 0603 1% Resistor
• 19.1k 0603 1% Resistor
  • This resistor may be substituted for a different value resistor if one of the zener mod LVP options is selected
• SOD-323 Diode
  • This diode will be replaced by a 200 ohm resistor if one of the zener mod options is selected
• Pair of 24 AWG Silicone Wires

Standard Clicky Firmware Options

• Standard FET with Memory.   Equipped with off-time memory, mode changes are intuitive and the light always picks right back up where you left off. 
  • Mode Levels:  Moonlight - 5% - 25% - 100%
• Standard FET with No Memory.  This is the second most popular option.  Equipped with off-time no memory, the light will always start on the first mode level after being turned off.  
• Custom Mode Levels.  Choose your own mode levels.  For this option, please enter the following information in your checkout comments:  
  • 1.  Number of light levels: 1-6 (plus moonlight if desired)
  • 2.  Approximate PWM levels of each mode:  Example: (1) 2% - (2) 15% - (3) 40% - (4) - 100%
  • 3.  Memory or No Memory
  • 4.  Ascending or Descending Mode Order

Standard Clicky Firmware Low Voltage Protection.  At around 3V under load, the light will blink three times then step down the power level.  At around 2.8V under load the light will blink ten times then shut off.  This system gives you ample warning and attempts to extend runtime before turning the light off.  

Universal guppydrv Clicky Firmware Option (Revs. 1 & 2)

For more information about this firmware, click here. 

Electronic Switch Firmware Options

• Standard FET Electronic Switch.  This is for use with an external electronic switch, where the driver is always powered, not for use with a standard clicky switch where power is cut by the switch to change modes.  This option uses STAR momentary firmware, which allows you to start on either the lowest or highest mode from off with either a short tap or long press of the switch.  
  • Moonlight - 5% - 25% - 100%
  • One side of the switch is soldered to ground, the other to the pre-tinned switch pad on the driver (connected to pin 2).
• Custom Mode Levels.  Choose your own mode levels.  For this option, please enter the following information in your checkout comments:  
  • 1.  Number of light levels: 1-6 (plus moonlight if desired)
  • 2.  Approximate PWM levels of each mode:  Example: (1) 2% - (2) 15% - (3) 40% - (4) - 100%
• Not recommended for use with the Zener Mod option (see below).

​Standard Electronic Switch Firmware Low Voltage Protection.  At around 3V under load, the light will step down the power level.  At around 2.6V under load the light will shut off.  You can override any low voltage shut down by holding down the electronic switch button.  This system gives you ample warning and attempts to extend runtime before turning the light off.  

2S+ Zener Mod Option

For use with more than 1 lithium cell on the input.  This option allows for 2S-3S cell driving.

The 10mm/12mm MTN boards also use a SOD-323 zener diode stacked on top of the input capacitor.  This may increase height of driver.  

• Please remember that this is not a buck or boost driver, so it can't step voltage up or down.  
• ​This means that the input voltage must be closely matched to the output.  
  • Example: 2 cells in series (8.4V) powering a 6V MT-G2 emitter; 3 cells in series (12.6V) powering 3 XM-L2 emitters in series.  ​
• Zener mod is not recommended for momentary switch applications, since it the driver will constantly draw around 0.01A when power is connected and will drain the cells rapidly while the light isn't in use.  

Zener Mod Low Voltage Protection.  You can choose between three options for low voltage protection with the zener mod option:

• No LVP:  Disable low voltage protection.
• ~6V LVP:  The light will begin to ramp down power at around 6V under load.  The light will shut off at around 5.5V under load.  
• ~9V LVP:  The light will begin to ramp down power at around 9V under load.  The light will shut off at around 8.25V under load.  

Turbo Timer (N/A for guppydrv FW)

A turbo timer may help reduce the chance of overheating.  Available Options:

• No Timer
• 30 Seconds
• 60 Seconds
• 90 Seconds
• 120 Seconds
• 180 Seconds

These PCBs and firmware are the result of the efforts of many of the members of the BLF community.  For more information, check out this thread.

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