BLF driver 1400m-17 [rev00e][tried & tested]
author: DEL
2 layer board of 0.69 x 0.69 inches (17.4 x 17.4 mm)
Uploaded:
December 10, 2016
Shared:
December 10, 2016
Total Price:
$2.35
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
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
