OSH Park
Profile for DEL
Shared projects
BLF driver DDm-23 [rev00a][tried & tested]
by DEL.
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
BLF driver DDm-17 [rev04b][tried & tested]
by DEL.
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
BLF driver DDm-M6/SRK [rev02a][untested]
by DEL.
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
BLF driver DDm-M6/SRK [rev01a][untested]
by DEL.
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
BLF driver 1400m-17 [rev00e][tried & tested]
by DEL.
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