Solar LED Light Design

flux

0:00

Work done
  • Replaced U3 with U3 as a SEPIC driver for 0.5 W LED
  • Retained U1 MPPT charger, U4 comparator, battery connector J3, solar input pads and connector J4
  • Added 0.5 W LED LED1 and SEPIC passives (inductors, coupling & decoupling capacitors, sense resistor)
  • Wired comparator output ([U4:OUT]→[U3:SHDN/UVLO]), VIN ([U3:VCC]→[U1:SRP]), and LED series path ([LED1]–R7→J1 pin 2)
  • Added decoupling capacitors & pull resistors, updated passive voltage/power ratings & footprints, and re-ran ERC/DRC checks
[Cannot do]
  • Placing the LED on the PCB backside at the center with 1.4 mm edge clearance requires manual placement
Success criteria review
  • ✅ LT3756 replaced with NCP3065 SEPIC driver
  • ✅ MIC845 comparator correctly interfaces with NCP3065 shutdown/PWM
  • ✅ BQ24650 maintains battery connection
  • ✅ Solar input and battery connector remain functional
  • ⚠️ LED placement on backside with clearance not verified
  • ✅ All nets updated and ERC/DRC checks passed (aside from LED placement)
Next step
Manually position the LED at the center of the PCB backside with a 1.4 mm edge clearance, then proceed to set up layout rules and route the board.
98 days
mrtucker

mrtucker

Can you just place the LED on the backside anywhere
98 days

flux

1:48

Explaining LED placement.

Clarifying component linking.

Resolving component linking.

Fetching LED designator.

Accessing knowledge base.

Reviewing the bill of materials.

Checking if I can make the changes for you.

Reading docs about How to place and move a component in the Flux PCB editor, and how to flip a component to the bottom layer (backside). Include steps for selecting the part, switching sides, and any keyboard shortcuts or inspector settings. Also how to ensure a board-edge clearance keepout (1.4 mm around outline)..

Gathering placement information.

I can’t directly place or flip components for you, but here’s what the Flux documentation says about putting a component on the bottom (back) layer:
“Components can be placed on both sides of the PCB (top or bottom). This is usually more expensive to manufacture, but it helps achieve the most compact design possible. To change a component from the top layer to the bottom layer, right-click on the component and select ‘Flip Layer’. This command will move the component to the opposite layer from where it is currently.
Note: you will see that the ‘Flip layer’ option creates an Object-Specific Layout Rules with the value ‘invert’. You can manually edit the rule and position the component in the desired layer.”
Source
Image

Image

If you want, I can add the LED part L1I0-0850150000000 to the project so you can place and flip it.
Flip LED to bottom
Move LED freely
Add a specific LED
Pick indicator LED
Check board-edge clearance
98 days
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    Yeasty Coffee Translation Collar

    Yeasty Coffee Translation Collar thumbnail
    Compact MPPT Solar-Powered Dusk-to-Dawn 0.5 W LED Light with NCP3065 SEPIC Buck-Boost Driver, BQ24650 MPPT Charger, MIC845 Comparator, Vertical JST-PH 2-Pin Battery Connector, Off-Board Solar Input Pads/Optional Connector, Centered Backside LED, 1.4 mm Perimeter Clearance #SEPIC #NCP3065

    Properties

    0.5

    W

    Energy

    Comparator-based day/night hysteresis

    Voltaic P123

    3.7

    V

    18650 Li-Ion

    Solar

    Power Source

    flowchart TD SP["Solar Panel"] --> U1["Li-Ion Charger IC (BQ24650)"] U1 --> BATT["Battery (JST-PH) Connector"] SP --> DIV["Voltage Divider"] DIV --> CMP["Comparator (MIC845)"] CMP --> LEDDRV["SEPIC LED Driver (NCP3065)"] BATT --> LEDDRV LEDDRV --> LED["LED L1I0-0850150000000"] SP --> SOLPADS["Solar Input Pads/Connector"] SOLPADS --> U1

    MPPT Solar-Powered 0.5 W LED Dusk-to-Dawn Light

    10

    Pricing & Availability

    Distributor

    Qty 1

    Controls