17mm/20mm/22mm/26mm FET Driver DIY Parts Kit - Single-Sided LFPAK

This kit contains all of the parts, except for the PCB itself, that you need to assemble your own single-sided LFPAK56 based FET driver, such as BLF member Wight's excellent A17DD-S08 or the MTN series of single-sided FET drivers (available in 17mm, 20mm, 22mm, and 26mm).

Each Kit Includes:

• Low-Resistance N-Channel LFPAK56 MOSFET
• Pre-Programmed Attiny13a MCU (Uses STAR Firmware)
  • Uses Fast PWM
• 10uF X6S MLCC Ceramic Capacitor
• 1uF X7R Ceramic Capacitor "Off-Time"
• 4.7k Resistor
• 19.1k Resistor
  • This resistor may be subsittuted 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
• Gold-Plated Spring
• Small Length of Solder Wick 
• Pair of 22 AWG Silicone Wires

Standard Clicky Firmware Options

• Standard FET with Memory.  This is the most popular option.  Equipped with off-time memory, mode changes are intuitive and the light always picks right back up where you left off. 
  • Mode Levels:  Moonlight (Solder #2 to ground) - 2% - 5% - 20% - 50% - 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

Clicky Pin Functions.  Soldering these numbered pins to ground will enable these features:

• 2 enables moonlight mode.
• 3 reverses mode order from the standard ascending (low to high) to descending (high to low).

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 2.6V 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.  
  • 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.

There are two options: MTN and S08.  The MTN 17mm and 20mm boards use a SOD-323 zener diode; the S08 boards use a SOD-123 zener diode.  The 22mm MTN boards also use a SOD-123 zener diode. 

• 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.  

2S LDO Option (MTN-22DD & MTN-26DD PCBs)

This is the option that is recommended for momentary switch setups and 2S cells.  The zener diode is replaced by a LDO voltage regulator, which has a much lower parasitic drain.

• Only for use with 2S cells.  3S cells will not work with the current LDO, which has a 12V maximum input voltage.  
• Kit includes:
  • 5V LDO
  • Extra 10uF X6S Capacitor (you will use two with this option)

LDO Low Voltage Protection.  You can choose between three options for low voltage protection with the LDO 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.  

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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