BLF SRK FET V2 - 46mm

by MTN.
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2 layer board of 1.89x1.83 inches (48.01x46.43 mm).
Shared on April 28th, 2015 01:37.

This is an update on the original BLF SRK FET driver which was designed by Mattaus, and inspired by the work of Comfychair and several other BLF members.

REQUIRED Parts List (1S Input):

  • FET: D2PAK
  • RGATE: 0805 - 10 ohm - 50 ohm
  • R1: 19.1K (1S input)
  • R2: 4.7K
  • U1: attiny13a-SSU
  • C1: 0805 - 10uF - X5R (or better)
  • D1: SOD-323 Schottky Diode

REQUIRED Parts List (2S+ Input):

  • FET: D2PAK
  • RGATE: 0805 - 10 ohm - 50 ohm
  • R1: 36K (2S-3S input)
  • R2: 4.7K
  • U1: attiny13a-SSU
  • C1: 0805 - 10uF - X5R (or better)
  • CLDO: 0805 - 10uF - X5R (or better)
  • LDO: Many fit - choose on price and availability

OPTIONAL Parts:

  • 7135: Optional 7135 for secondary PWM output (Pin 5)
  • OTC (for clicky FW use): 0805 - 1uF - X7R
  • Ctemp: 0805 Capacitor
  • RT1; RT2; T-; T+: Connection points and related component pads for external temperature sensor

Changes from original:

  • Additional vias
  • Deleted L1 and D1 pads (they were mostly unused)
  • Added more LED pads
  • Added optional 7135 on secondary PWM channel
  • Added optional LDO for 2S+ use
  • Changed ADC LVP feed point; now connected directly to input
  • No more jumpers or solder bridges needed for switch pads
  • SW- and several other low current pads now have thermal relief for easier soldering
  • Added optional OTC pad for clicky use
  • Added external temperature sensor provisions
  • Added gate resistor / pulldown resistor for big FET

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