OSH Park ~ Profile for DEL

BLF driver GT-buck [rev 04][tried and tested]

2 layer board of 1.82 x 1.82 inches (46.1 x 46.1 mm).
Uploaded: September 26th, 2017 23:25.
Shared: December 8th, 2017 10:26
Total Price: $16.50

Top

Bottom

This is the driver used in the production version of …

This is the driver used in the production version of the BLF GT light.

[Bunny logo is the property of Lumintop, manufacturer of the GT]

Features

2.5 A buck regulator with constant current output
Attiny85 MCU, supported by NarsilM 1.2 and up firmware
Most BLF ‘1-channel’ and ‘2-channel’ firmware can be made to work with a few simple changes
0.4 V dropout voltage, <150 μA parasitic drain
Support for button indicator light

Revision changes

00 - driver prototype
01 - cosmetic changes
02 - adapted to the prototype 1 hosts and cell cradles (dedicated ground ring)
03 - copper added back to retaining ring area
04 - adapted to the production version hosts and cell cradles (retaining ring for ground)

Suggested parts list

Part no.	Value	Type	Package
C1	1u	X7R, 25 V	C0603
C2	3.3u - 10u	X5R, 16 V	C0805
C4	1u	X7R, 25 V	C0603
C11	4u7	X7R, 50 V	C1206
C12	4u7	X7R, 50 V	C1206
C13	4u7	X7R, 50 V	C1206
C14	4u7	X7R, 50 V	C1206
C15	470p	C0G, 50 V	C0603
C16	1u	X7R, 25 V	C0603
C17	4u7	X7R, 50 V	C1206
D1	SS34	Schottky, 40 V, 3 A	SMC/DO-214AB
L1	10u	Bourns SRR1208-100ML	12x12x8 mm
Q1	AOD417	P-chan <50 mohm <20 nC	TO252 / DPAK
R1	1M	1%	R0603
R2	47k	1%	R0603
R3	10R	1%	R0603
R4	10k	1%	R0603
R5	3k3	1%	R0603
R6	n/p
R7	1k	1%	R0603
R8	33k	1%	R0603
R11	0R091	1%, <300 ppm/C, 1-3 W	R2512
R12	47k	1%	R0603
R13	n/p
R14	4k7	1%	R0603
U1	ATTINY85-20SU		SOIC-8
U2	MIC5235-5	5 V LDO regulator	SOT23-5
U3	LM3409	Buck controller	HVSSOP-10

Output current range is determined by the R4/R5 ratio and the sense resistor (R11) value. R4/R5 could be used to lower the current, but to increase the current R11 should be adjusted:

Iout = 0.248 / R11 - 0.15
or R11 = 0.248 / (Iout + 0.15)

(the 0.15 offset is determined by the inductor ripple current and will change if the inductor value or switching frequency is modified)

alt text

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

BLF driver GT-buck [rev 04][tried and tested]

2 layer board of 1.82 x 1.82 inches (46.1 x 46.1 mm).
Uploaded: September 26th, 2017 23:25.
Shared: December 8th, 2017 10:26
Total Price: $16.50

This is the driver used in the production version of …

This is the driver used in the production version of the BLF GT light.

[Bunny logo is the property of Lumintop, manufacturer of the GT]

Features

2.5 A buck regulator with constant current output
Attiny85 MCU, supported by NarsilM 1.2 and up firmware
Most BLF ‘1-channel’ and ‘2-channel’ firmware can be made to work with a few simple changes
0.4 V dropout voltage, <150 μA parasitic drain
Support for button indicator light

Revision changes

00 - driver prototype
01 - cosmetic changes
02 - adapted to the prototype 1 hosts and cell cradles (dedicated ground ring)
03 - copper added back to retaining ring area
04 - adapted to the production version hosts and cell cradles (retaining ring for ground)

Suggested parts list

Part no.	Value	Type	Package
C1	1u	X7R, 25 V	C0603
C2	3.3u - 10u	X5R, 16 V	C0805
C4	1u	X7R, 25 V	C0603
C11	4u7	X7R, 50 V	C1206
C12	4u7	X7R, 50 V	C1206
C13	4u7	X7R, 50 V	C1206
C14	4u7	X7R, 50 V	C1206
C15	470p	C0G, 50 V	C0603
C16	1u	X7R, 25 V	C0603
C17	4u7	X7R, 50 V	C1206
D1	SS34	Schottky, 40 V, 3 A	SMC/DO-214AB
L1	10u	Bourns SRR1208-100ML	12x12x8 mm
Q1	AOD417	P-chan <50 mohm <20 nC	TO252 / DPAK
R1	1M	1%	R0603
R2	47k	1%	R0603
R3	10R	1%	R0603
R4	10k	1%	R0603
R5	3k3	1%	R0603
R6	n/p
R7	1k	1%	R0603
R8	33k	1%	R0603
R11	0R091	1%, <300 ppm/C, 1-3 W	R2512
R12	47k	1%	R0603
R13	n/p
R14	4k7	1%	R0603
U1	ATTINY85-20SU		SOIC-8
U2	MIC5235-5	5 V LDO regulator	SOT23-5
U3	LM3409	Buck controller	HVSSOP-10

Output current range is determined by the R4/R5 ratio and the sense resistor (R11) value. R4/R5 could be used to lower the current, but to increase the current R11 should be adjusted:

Iout = 0.248 / R11 - 0.15
or R11 = 0.248 / (Iout + 0.15)

(the 0.15 offset is determined by the inductor ripple current and will change if the inductor value or switching frequency is modified)

alt text

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

Project Permalink URL

BLF switch board DDm-K2-SW [rev01][tried and tested]

2 layer board of 0.61 x 0.57 inches (15.4 x 14.4 mm).
Uploaded: June 2nd, 2017 18:46.
Shared: June 17th, 2017 19:28
Total Price: $1.70

Top

Bottom

Daughter board for the DDm-K2 driver board.

<https://o…

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

BLF switch board DDm-K2-SW [rev01][tried and tested]

2 layer board of 0.61 x 0.57 inches (15.4 x 14.4 mm).
Uploaded: June 2nd, 2017 18:46.
Shared: June 17th, 2017 19:28
Total Price: $1.70

Daughter board for the DDm-K2 driver board.

<https://o…

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

Project Permalink URL

BLF driver 2.1m-K2 [rev00][tried and tested]

2 layer board of 1.34 x 1.34 inches (34.0 x 34.0 mm).
Uploaded: June 2nd, 2017 19:21.
Shared: June 17th, 2017 19:27
Total Price: $8.95

Top

Bottom

5+1 7135 driver for Solarstorm/Fandyfire K2 lights.

…

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

BLF driver 2.1m-K2 [rev00][tried and tested]

2 layer board of 1.34 x 1.34 inches (34.0 x 34.0 mm).
Uploaded: June 2nd, 2017 19:21.
Shared: June 17th, 2017 19:27
Total Price: $8.95

5+1 7135 driver for Solarstorm/Fandyfire K2 lights.

…

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

Project Permalink URL

BLF driver 5.6m-SRK [rev02][untested]

2 layer board of 1.82 x 1.81 inches (46.2 x 46.0 mm).
Uploaded: May 15th, 2017 23:38.
Shared: June 7th, 2017 11:04
Total Price: $16.45

Top

Bottom

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

BLF driver 5.6m-SRK [rev02][untested]

2 layer board of 1.82 x 1.81 inches (46.2 x 46.0 mm).
Uploaded: May 15th, 2017 23:38.
Shared: June 7th, 2017 11:04
Total Price: $16.45

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

Project Permalink URL

BLF driver DDm-23.2S [rev00a][untested]

2 layer board of 1.02 x 0.89 inches (25.9 x 22.6 mm).
Uploaded: April 28th, 2017 01:13.
Shared: April 28th, 2017 01:17
Total Price: $4.50

Top

Bottom

LDO version of the Yezl Y3 driver, for 2S lights.

Su…

Permalink Embed link

Download Order Board

Embeddable link to order this shared Project

BLF driver DDm-23.2S [rev00a][untested]

2 layer board of 1.02 x 0.89 inches (25.9 x 22.6 mm).
Uploaded: April 28th, 2017 01:13.
Shared: April 28th, 2017 01:17
Total Price: $4.50

Profile for DEL

Shared projects

BLF driver GT-buck [rev 04][tried and tested]

This is the driver used in the production version of …

This is the driver used in the production version of the BLF GT light.

Features

Revision changes

Suggested parts list

BLF driver GT-buck [rev 04][tried and tested]

This is the driver used in the production version of …

This is the driver used in the production version of the BLF GT light.

Features

Revision changes

Suggested parts list

BLF switch board DDm-K2-SW [rev01][tried and tested]

BLF switch board DDm-K2-SW [rev01][tried and tested]

BLF driver 2.1m-K2 [rev00][tried and tested]

…

Revision changes

BLF driver 2.1m-K2 [rev00][tried and tested]

…

Revision changes

BLF driver 5.6m-SRK [rev02][untested]

BLF driver 5.6m-SRK [rev02][untested]

BLF driver DDm-23.2S [rev00a][untested]

BLF driver DDm-23.2S [rev00a][untested]