HardLabs

EKA-PiF-MCU PSU

Blaze-Pascal·EKA-PiF-MCU_PSU·KiCad/MCU_PSU/MCU_PSU.kicad_pcb

EKA-PiF-MCU PSU PCB layout, top view — open source STM32 board by Blaze-Pascal

About the EKA-PiF-MCU PSU PCB

EKA-PiF-MCU PSU is an open source STM32 PCB design by Blaze-Pascal, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 76 × 74.3 mm, with 105 components from 42 distinct parts.

Its main chip is the STM32G474CBTx, from the STM32 family. Other key parts include the LDI1117-3.3H, UCC27211D and TPS560430XDBVR-MS. By type, the board carries 40 resistors, 34 capacitors, 6 ICs, 6 transistors, 6 connectors and 6 diodes.

It belongs with the power & battery and displays & leds designs in this gallery.

From the project

2-phase synchronous digitally controlled buck converter (30V in, up to 10A out). Features a 4-layer custom KiCad PCB optimized for EMI. Firmware written in C (HAL) for STM32G474, leveraging advanced hardware accelerators (HRTIM, FMAC) for dual-loop voltage/current control and LCD UI.

Goal: Build a multi-phase, MCU-controlled high-power buck converter to act as a current amplifier for a linear lab power supply (30V/5A) at lower voltages.

Project Scope: - Custom Hardware: 4-layer power stage and control circuitry designed in KiCad with focus on EMI mitigation. Switching at 250 kHz, designed for 10A at 12V output. - Advanced MCU Control: Firmware written in C (STM32 HAL) for the STM32G474, utilizing a software-defined voltage loop (via FMAC), a pure-hardware current protection loop, and hardware encoder UI integration.

EKA-PiF-MCU PSU, from the project README
From the project README

Main components on the EKA-PiF-MCU PSU

STM32G474CBTxLDI1117-3.3HUCC27211DTPS560430XDBVR-MS

EKA-PiF-MCU PSU bill of materials (BOM)

105 components, 42 distinct parts.

QtyPartRefs
1
STM32G474CBTx
U1
1
LDI1117-3.3H
U2
2
UCC27211D
U101, U201
2
TPS560430XDBVR-MS
U301, U401
2
BSS138
Q1, Q2
2
AONS66406
Q101, Q201
2
AON6144
Q102, Q202
1
XL7EL89CKI-111YLC-32M
Y1
1
P_IN
J1
1
P_Out
J4
1
UNUSED_PINS
J5
1
SWD_CONN
J6
1
ENC_CONN
J7
1
I2C_CONN
J8
1
7A
F1
1
SW_Push
SW1
1
B_LED
D1
1
R_LED
D2
3
G_LED
D3, D4, D5
1
BAV99
D6
Show 22 more
QtyPartRefs
2
22uH@6,5/8,5A
L101, L201
1
33uH
L301
1
15uH
L401
12
100n
C1, C4, C6, C7, C8, C9, C11, C13 +4
2
8.2p
C2, C3
2
100u
C5, C10
9
10u
C12, C101, C103, C104, C105, C201, C203, C204 +1
1
22u
C14
8
22u
C15, C16, C106, C107, C108, C206, C207, C208
2
3.3k
R1, R5
14
10k
R2, R3, R12, R14, R16, R17, R18, R20 +6
2
1k
R4, R6
2
100R
R7, R9
1
0
R8
1
470k
R10
2
33k
R11, R402
6
100k
R13, R15, R19, R21, R24, R303
4
3.3R
R101, R102, R201, R202
2
0R01
R103, R203
2
150k
R301, R401
1
12k
R302
1
220k
R403

EKA-PiF-MCU PSU design files

The KiCad project lives in the Blaze-Pascal/EKA-PiF-MCU_PSU repository on GitHub; these links point at the commit this page was built from.

EKA-PiF-MCU PSU: common questions

What microcontroller does the EKA-PiF-MCU PSU use?

The EKA-PiF-MCU PSU is built around the STM32G474CBTx, from the STM32 family.

How big is the EKA-PiF-MCU PSU PCB?

The EKA-PiF-MCU PSU measures 76 × 74.3 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the EKA-PiF-MCU PSU?

105 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the EKA-PiF-MCU PSU design files?

From the Blaze-Pascal/EKA-PiF-MCU_PSU repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the EKA-PiF-MCU PSU design in my own project?

Yes, under the terms of its GPL-3.0 license, which Blaze-Pascal chose for the repository.

Can I test firmware for the EKA-PiF-MCU PSU without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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