LED Driver Design with Arduino

flux

Blocked: your account has no available ACUs, so I can’t continue executing tools right now.
Accomplished:
  • Resolved the Arduino Nano VIN ERC by marking VIN as intentionally unused; the Nano is powered from 5V_CTRL.
  • Searched for the exact OSRAM GW CPSRM1.PM; it is not currently available in the Flux library, so I kept the closest available OSRAM 700 mA LED stand-in and submitted a missing-part request.
  • Selected and applied SMMS0650-680M as the real 68 µH shielded inductor candidate for L1–L5, using the closest valid footprint option.
  • Set the board to 140 × 90 mm, 4-layer stackup, and placed the LEDs as 5 horizontal rows of 3 LEDs, with each driver channel beside its row.
Open items:
  • Need to rerun ERC/DRC after ACUs are available to confirm the VIN issue is clean and check placement.
  • The exact GW CPSRM1.PM still needs to be imported/created from a datasheet if you want exact BOM/footprint fidelity.
  • High-current trace-width/layout rules still need to be applied; the last layout-rule call was blocked by a selector issue before I could correct it.
Suggested next steps:
  1. Re-run ERC/DRC and fix any new placement/footprint issues.
  2. Import/create the exact OSRAM GW CPSRM1.PM part from its datasheet.
  3. Apply high-current net trace-width rules and thermal copper guidance.
  4. Route the PCB after confirming the LED row placement.
Create LED part
Run ERC/DRC
Set trace rules
Review BOM
Finish verification
U_REG1
U_MCU1
GND
GND
U4 GND - R3 P2
D4 A - U4 GND
GND
D5 A - U5 GND
D2 A - U2 GND
U3 GND - R2 P2
U1 GND - R_SENSE1 P2
U2 GND - R1 P2
D2 A - U2 GND
D3 A - U3 GND
GND
U3 GND - R2 P2
D3 A - U3 GND
U3 GND - R2 P2
GND
U1 GND - R_SENSE1 P2
U5 GND - R4 P2
GND
U2 GND - R1 P2
GND
GND
D4 A - U4 GND
U2 GND - R1 P2
U5 GND - R4 P2
U4 GND - R3 P2
GND
GND
U5 GND - R4 P2
D1 A - U1 GND
GND
U1 GND - R_SENSE1 P2
D5 A - U5 GND
U4 GND - R3 P2
D1 A - U1 GND
GND
U3 VDD - R6 P1
F1 P2 - D_PROT1 K
J1 1 - F1 P1
U1 Rs - R_SENSE1 P1
F1 P2 - D_PROT1 K
U11 K - U12 A
U3 VDD - R6 P1
U8 K - U9 A
F1 P2 - D_PROT1 K
U2 PWMD - U_MCU1 D5
U3 RT - R6 P2
U3 SW - L3 P2
U1 SW - L1 P2
U3 SW - L3 P2
U5 RT - R8 P2
U6 K - U7 A
U2 VDD - R5 P1
U5 SW - L5 P2
U4 SW - L4 P2
U1 VDD - R_T1 P1
U8 K - U9 A
U4 RT - R7 P2
U4 VDD - R7 P1
U4 PWMD - U_MCU1 D9
U2 SW - L2 P2
U6 K - U7 A
U5 SW - L5 P2
U13 K - L3 P1
U17 K - U18 A
F1 P2 - D_PROT1 K
U7 K - L1 P1
U19 K - L5 P1
U1 SW - L1 P2
U3 VDD - R6 P1
U4 VDD - R7 P1
U1 Rs - R_SENSE1 P1
U9 K - U10 A
U2 Rs - R1 P1
U14 K - U15 A
F1 P2 - D_PROT1 K
L_REG1 P2 - U_REG1 FB
U16 K - L4 P1
U5 PWMD - U_MCU1 D10
U10 K - L2 P1
U13 K - L3 P1
F1 P2 - D_PROT1 K
U1 RT - R_T1 P2
F1 P2 - D_PROT1 K
U5 Rs - R4 P1
U2 Rs - R1 P1
U3 PWMD - U_MCU1 D6
U5 VDD - R8 P1
U4 RT - R7 P2
U12 K - U13 A
LED1 K - U6 A
U1 VDD - R_T1 P1
U4 Rs - R3 P1
U1 RT - R_T1 P2
U3 SW - L3 P2
U5 RT - R8 P2
U12 K - U13 A
F1 P2 - D_PROT1 K
L_REG1 P2 - U_REG1 FB
U5 PWMD - U_MCU1 D10
U_REG1 CB - C_5V1 P1
U15 K - U16 A
U19 K - L5 P1
U2 RT - R5 P2
F1 P2 - D_PROT1 K
LED1 K - U6 A
U2 VDD - R5 P1
U16 K - L4 P1
U10 K - L2 P1
U5 Rs - R4 P1
U4 Rs - R3 P1
U18 K - U19 A
U2 VDD - R5 P1
U14 K - U15 A
U_REG1 CB - C_5V1 P1
F1 P2 - D_PROT1 K
F1 P2 - D_PROT1 K
F1 P2 - D_PROT1 K
L_REG1 P2 - U_REG1 FB
U4 PWMD - U_MCU1 D9
U5 VDD - R8 P1
U2 PWMD - U_MCU1 D5
U4 VDD - R7 P1
U17 K - U18 A
U4 SW - L4 P2
U5 SW - L5 P2
U_REG1 SW - C_5V1 P2
F1 P2 - D_PROT1 K
L_REG1 P2 - U_REG1 FB
U7 K - L1 P1
U11 K - U12 A
U1 PWMD - U_MCU1 D3
U3 Rs - R2 P1
U1 SW - L1 P2
U_REG1 SW - C_5V1 P2
U2 SW - L2 P2
U3 PWMD - U_MCU1 D6
U9 K - U10 A
U5 VDD - R8 P1
U1 PWMD - U_MCU1 D3
U3 Rs - R2 P1
U2 SW - L2 P2
F1 P2 - D_PROT1 K
U15 K - U16 A
J1 1 - F1 P1
F1 P2 - D_PROT1 K
U3 RT - R6 P2
U2 RT - R5 P2
U1 VDD - R_T1 P1
U_REG1 SW - C_5V1 P2
U4 SW - L4 P2
U18 K - U19 A
L3
Inductance
68µH
L4
Inductance
68µH
C6
Capacitance
4.7 µF
C_VDD1
Capacitance
1 µF
L5
Inductance
68µH
C1
Capacitance
1 µF
L_REG1
Inductance
22 µH
C_5V1
Capacitance
10 µF
C_BULK1
Capacitance
470 µF
C_IN1
Capacitance
4.7 µF
L1
Inductance
68µH
C5
Capacitance
4.7 µF
C8
Capacitance
4.7 µF
C3
Capacitance
1 µF
C7
Capacitance
4.7 µF
L2
Inductance
68µH
C4
Capacitance
1 µF
C2
Capacitance
1 µF
C9
Capacitance
10 µF
R3
Resistance
0.36 Ω
R8
Resistance
100 kΩ
R6
Resistance
100 kΩ
R2
Resistance
0.36 Ω
R7
Resistance
100 kΩ
R1
Resistance
0.36 Ω
R4
Resistance
0.36 Ω
R_T1
Resistance
100 kΩ
R5
Resistance
100 kΩ
R_SENSE1
Resistance
0.36 Ω
U2
D3
U19
U13
D1
U15
U9
U5
U1
U4
U7
U6
D5
U16
U18
D4
U12
U14
U17
U11
D2
LED1
U10
U8
U3
F1
J1
D_PROT1
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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  • Generic Capacitor
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    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
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  • Generic Resistor
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  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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Arduino 15-LED Constant Current Driver

Arduino 15-LED Constant Current Driver thumbnail
A 24V, five-channel 700mA constant-current OSRAM LED driver system with Arduino Nano PWM dimming.

Layout Rules

mm

Yes

10mm

Top

deg

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$6.99–$7.55

Digi-Key

$5.85–$6.83

HQonline

$1.23–$1.58

LCSC

$16.00–$16.33

Mouser

$8.59

TME

$2.35

Verical

$0.42–$0.50

Controls