Shared projects

BLF driver DDm-23 [rev00a][tried & tested]

by DEL.
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2 layer board of 1.02x0.89 inches (25.86x22.63 mm).
Shared on January 17th, 2017 01:15.

BLF flashlight driver for Yezl Y3, DD+m

Features

  • 23 mm direct drive + 350 mA regulator LED driver
  • R5 to eliminate unintentional Vcc boosting during PWM.
  • R3, R4 for stable drive of FET.
  • Oversized heat plane for the 7135 with good thermal link to the ground ring.
  • Generous 0603 pad sizes that will accept 0805 parts as well.
  • Universal package size for MCU. Tiny13-85 fits.

Revision changes

  • New

Suggested parts list

  • U1: Atmel Attiny25, SSU or SSN package
  • U2: 7135 350 mA LED driver
  • Q1: Vishay SiR800DP
  • C1: 10 uF, X5R or better, 0805
  • D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
  • R1: 22 / 330 kohm, 1%, 0603 (R1, R2 larger values for e-switch lights)
  • R2: 4.7 / 100 kohm, 1%, 0603
  • R3: 100 kohm, 5%, 0603
  • R4: 47 ohm, 5%, 0603
  • R5: 4.7 ohm, 5%, 0603

    Tactile switch is Digikey part no:

  • EG4389CT-ND
  • or EG4388CT-ND

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BLF driver DDm-17 [rev04b][tried & tested]

by DEL.
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2 layer board of 0.69x0.69 inches (17.42x17.42 mm).
Shared on January 12th, 2017 23:32.

BLF flashlight driver, 17 mm, DD+m

Features

  • 17 mm direct drive + 350 mA regulator LED driver
  • No OTC - Intended for e-switch, memory-decay or no-memory firmware.
  • R5 to eliminate unintentional Vcc boosting during PWM.
  • R3 to eliminate unintentional flashing during mode changes.
  • Oversized heat plane for the 7135 with good thermal link to the ground ring.
  • Generous 0603 pad sizes through-out that will accept 0805 parts as well.
  • ‘SS’ SOIC package size for MCU. Tiny85 requires pin-bending to fit.

Revision changes

  • Move MCU and 7135 slightly for better programming clip clearance

Suggested parts list

  • U1: Atmel Attiny25, SSU or SSN package
  • U2: 7135 350 mA LED driver
  • Q1: Vishay SiR800DP
  • C1: 10 uF, X5R or better, 0603 or 0805
  • D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
  • R1: 22 / 330 kohm, 1%, 0603 (R1, R2 larger values for e-switch lights)
  • R2: 4.7 / 100 kohm, 1%, 0603
  • R3: 100 kohm, 5%, 0603
  • R5: 4.7 ohm, 5%, 0603

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BLF driver DDm-M6/SRK [rev02a][untested]

by DEL.
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2 layer board of 1.82x1.82 inches (46.20x46.20 mm).
Shared on January 9th, 2017 12:05.

BLF flashlight driver for M6/SRK lights, DD+CC

Features

  • 46 mm diameter.
  • Two channel output: Direct drive + current regulator LED driver.
  • R5, R3, R4, C2 for enhanced stability.
  • Oversized heat plane for the 7135s with good thermal link to the ground ring.
  • Generous 0603 pad sizes through-out that will accept 0805 parts as well.
  • Universal MCU pads, Tiny13-Tiny85 all fit.
  • Generous wire pads for emitters, e-switch and side indicator LED.

Revision changes

  • Added pads for up to eight 7135 regulators
  • Up-size C1, D1 pads to 0805
  • Add C3 for optional load decoupling

Suggested parts list

  • U1: Atmel Attiny25, SSU or SSN package
  • U2-U9: 7135 350 mA LED driver
  • Q1: Vishay SiR800DP
  • C1: 10 uF, X5R or better, 0805
  • C2: 100 nF, X7R or better, 0603
  • C3: Optional, 10 uF, X5R or better, 0805
  • D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
  • R1: 330 kohm, 1%, 0603
  • R2, R3: 100 kohm, 1%, 0603
  • R4: 47 ohm, 5%, 0603
  • R5: 4.7 ohm, 5%, 0603

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BLF driver DDm-M6/SRK [rev01a][untested]

by DEL.
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2 layer board of 1.82x1.82 inches (46.20x46.20 mm).
Shared on January 3rd, 2017 22:12.

BLF flashlight driver for M6/SRK lights, DD+m

Features

  • 46 mm diameter.
  • Two channel output: Direct drive + 350 mA regulator LED driver.
  • R5, R3, R4, C2 for enhanced stability.
  • Oversized heat plane for the 7135 with good thermal link to the ground ring.
  • Generous 0603 pad sizes through-out that will accept 0805 parts as well.
  • Universal MCU pads, Tiny13-Tiny85 all fit.
  • Generous wire pads for emitters, e-switch and side indicator LED.

Revision changes

  • Fix text on back
  • Move and enlarge extra ground pad

Suggested parts list

  • U1: Atmel Attiny25, SSU or SSN package
  • U2: 7135 350 mA LED driver
  • Q1: Vishay SiR800DP
  • C1: 10 uF, X5R or better, 0603 or 0805
  • C2: 100 nF, X7R or better, 0603
  • D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
  • R1: 330 kohm, 1%, 0603
  • R2, R3: 100 kohm, 1%, 0603
  • R4: 47 ohm, 5%, 0603
  • R5: 4.7 ohm, 5%, 0603

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BLF driver 1400m-17 [rev00e][tried & tested]

by DEL.
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2 layer board of 0.69x0.69 inches (17.42x17.42 mm).
Shared on December 10th, 2016 16:18.

BLF flashlight driver, 17 mm, 1.4 A + m

Features

  • 7135 1400 mA regulated LED driver
  • Dual channel (3+1 7135)
  • No OTC - Intended for memory-decay or no-memory firmware.
  • R5 to eliminate unintentional Vcc boosting during PWM.
  • Cell voltage read upstream of D1.
  • Oversized heat plane for the 7135s with good thermal link to the ground ring.
  • Generous 0603 pad sizes through-out that will accept 0805 parts as well.
  • ‘SS’ SOIC package size for MCU. Tiny85 requires pin-bending to fit.

Revision changes

  • New

Suggested parts list

  • U1: Atmel Attiny25, SSU or SSN package
  • U2-5: 7135 350 mA LED driver
  • C1: 10 uF, X5R or better, 0603 or 0805
  • D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
  • R1: 22 kohm, 1%, 0603
  • R2: 4.7 kohm, 1%, 0603
  • R5: 4.7 ohm, 5%, 0603

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