Sepic
About the Sepic PCB
Sepic is an open source PCB design by blazra, published on GitHub under the 0BSD license. It is a 2-layer board measuring 100 × 50 mm, with 53 components from 30 distinct parts.
Other key parts include the LT8710 and NSI50010YT1G. By type, the board carries 25 capacitors, 11 resistors, 4 diodes, 3 ICs, 2 transistors and 2 connectors.
From the project
SEPIC converter design as a school project
Schematic: kicad/sepic/sepic.pdf Write-up in czech: SEPICRadovanBlazek.pdf LibreOffice sheet with measured data: Measurements.ods LibreOffice sheet with component values calculations as per LT8710 datasheet: SEPIC_calculations.ods LT8710 datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/8710f.pdf
Bugs in Rev. 1: - SYNC input of the LT8710 is not pulled to GND
Main components on the Sepic
Sepic bill of materials (BOM)
53 components, 30 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LT8710 | HTSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP3.4x6.5mm_Mask2.75x3.43mm_ThermalVias_HandSolder | U1 |
| 2 | NSI50010YT1G | D_SOD-123 | U2, U3 |
| 1 | FDMS86150 | TDSON-8-1 | Q1 |
| 1 | Si7141DP | TDSON-8-1 | Q2 |
| 1 | Input | TerminalBlock_PTR_P5.00mm_Horizontal | J1 |
| 1 | Output | TerminalBlock_PTR_P5.00mm_Horizontal | J2 |
| 1 | 20A HRC | Fuseholder_Cylinder-5x20mm_Schurter_OGN-SMD_Horizontal_Open | F1 |
| 1 | MODE | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | EN/FBIN | Potentiometer_Vishay_TS53YJ_Vertical | RV1 |
| 1 | FBX | Potentiometer_Bourns_3296W_Vertical | RV2 |
| 1 | RT | Potentiometer_Vishay_TS53YJ_Vertical | RV3 |
| 1 | TVS | D_SMC | D1 |
| 1 | INPUT | LED_0805_2012Metric_Castellated | D2 |
| 1 | OUTPUT | LED_0805_2012Metric_Castellated | D3 |
| 1 | FLAG | LED_0805_2012Metric_Castellated | D4 |
| 1 | Wurth WE-CFWI 74485542680 | Wurth_WE-CFWI_1813 | L1 |
| 12 | 10uF | C_1206_3216Metric | C1, C2, C7, C8, C9, C10, C14, C15 +4 |
| 4 | 4.7nF | C_0805_2012Metric | C3, C4, C5, C6 |
| 3 | 68uF | CP_Elec_10x12.5 | C11, C12, C13 |
| 2 | 10uF | C_0805_2012Metric | C20, C23 |
Show 10 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 47nF | C_0805_2012Metric | C21 |
| 1 | 220nF | C_0805_2012Metric | C22 |
| 1 | 100pF | C_0805_2012Metric | C24 |
| 1 | 6.8nF | C_0805_2012Metric | C25 |
| 2 | R | R_0805_2012Metric | R1, R5 |
| 1 | 100k | R_0805_2012Metric | R2 |
| 2 | 1m | R_2512_6332Metric | R3, R4 |
| 4 | 5.1R | R_0805_2012Metric | R6, R7, R8, R9 |
| 1 | 8.87k | R_0805_2012Metric | R10 |
| 1 | 3.6k | R_0805_2012Metric | R11 |
Sepic design files
The KiCad project lives in the blazra/sepic repository on GitHub; these links point at the commit this page was built from.
Sepic: common questions
How big is the Sepic PCB?
The Sepic measures 100 × 50 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Sepic?
53 components, from 30 distinct parts. The full bill of materials is listed on this page.
Where can I download the Sepic design files?
From the blazra/sepic repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Sepic design in my own project?
Yes, under the terms of its 0BSD license, which blazra chose for the repository.