Constant current LED driver 8 channels (PT4115)

Completed

STD Constant current LED driver 8 channels (PT4115)

License: GPL 3.0

Mode:

Editors' pick

Update time： 2024-01-04 14:33:07

Creation time： 2023-08-01 13:12:30

Description

Constant current LED driver with 8 channels based on PT4115.
Controlled by ESP32, for use with ArtNet protocol.
Power supply from 8V to 30V (use suitable capacitor voltage) allow connecting several LEDs in series on each channel.
Change 0.13R resistor to set max current (Current = 0.1/R).
Some pin headers for future extensions, like servo to make a tiny moving head projector.

Provided source code is for ArtNet control with 2 RGB and 2 White with following DMX config :

Design Drawing

schematic diagram

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PCB

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BOM

ID	Name	Designator	Footprint	Quantity
1	1u	C1,C2,C3,C4,C9,C10,C11,C12	CP_TANTALUM_CASE-B_EIA-3528-21_REFLOW	8
2	100u	C5,C6,C7,C8,C13,C14,C15,C16	CP_TANTALUM_CASE-D_EIA-7343-31_REFLOW	8
3	SS34	D1,D2,D3,D4,D5,D6,D7,D8,D9	SMA_L4.3-W2.5-LS5.0-FD	9
4	100uH	L1,L2,L3,L4,L5,L6,L7,L8	IND-SMD_L7.3-W7.3_CDRH74	8
5	LED0	P1	CONN-TH_2P-P5.00_KF301-2P	1
6	LED1	P2	CONN-TH_2P-P5.00_KF301-2P	1
7	LED2	P3	CONN-TH_2P-P5.00_KF301-2P	1
8	LED3	P4	CONN-TH_2P-P5.00_KF301-2P	1
9	LED4	P5	CONN-TH_2P-P5.00_KF301-2P	1
10	LED5	P6	CONN-TH_2P-P5.00_KF301-2P	1
11	LED6	P7	CONN-TH_2P-P5.00_KF301-2P	1
12	LED7	P8	CONN-TH_2P-P5.00_KF301-2P	1
13	0.13	R1,R2,R3,R4,R5,R6,R7,R8	R1206	8
14	PT4115	U1,U2,U3,U4,U5,U6,U7,U8	SOT-89-5_L4.5-W2.5-P1.50-LS4.5-BR	8
15	220u	C17	CAP-SMD_BD6.3-L6.6-W6.6-LS7.6-FD	1
16	10uF	C18	C1206	1
17	470u	C19	CAP-SMD_BD10.0-L10.3-W10.3-LS11.0-FD-1	1
18	100nF	C20,C21,C23	C0805	3
19	22uF	C24	C1206	1
20	SERVO1	J1	HDR-M-2.54_1X3	1
21	PROG	J2	HDR-M-2.54_1X3	1
22	SERVO2	J3	HDR-M-2.54_1X3	1
23	UART2	J4	HDR-M-2.54_1X3	1
24	EXT	J5	HDR-M-2.54_1X5	1
25	47uH	L9	IND-SMD_L10.0-W10.0_SUMIDA_CDRH104	1
26	LED	LED1,LED2	LED0805_RED	2
27	3MMHOLE_PTH	P9,P10,P11,P12	MOUNTINGHOLE_2.7MM_M2.5_PAD	4
28	EN	PUSH1	KEY-SMD_4P-L6.0-W6.0-P4.50	1
29	IO0	PUSH2	KEY-SMD_4P-L6.0-W6.0-P4.50	1
30	1k	R9,R10	R0805	2
31	10k	R11,R12,R13,R14,R15,R16,R17,R18,R19,R20,R21,R22	R0805	12
32	AMS1117-3.3	U9	SOT-223-3_L6.5-W3.4-P2.30-LS7.0-BR	1
33	POWER	U10	CONN-TH_2P-P5.00_KF301-2P	1
34	ESP32-WROOM-32E-N16	U11	WIFI-SMD_ESP32-WROOM-32E	1
35	LM2596S-5.0	U12	TO-263-5_L10.2-W8.9-P1.70-BR	1