HardLabs

Pwm-2420-lus

LibreSolar·pwm-2420-lus·kicad/pwm-2420-lus.kicad_pcb

Pwm-2420-lus PCB layout, top view — open source STM32 board by LibreSolar

About the Pwm-2420-lus PCB

Pwm-2420-lus is an open source STM32 PCB design by LibreSolar, published on GitHub under the CC-BY-SA-4.0 license. It is a board measuring 90 × 85 mm, with 115 components from 42 distinct parts.

Its main chip is the STM32L072CZTx, from the STM32 family. Other key parts include the TLV9002, MC34063AD, D1213A-04SO and LP2950-3.3_TO252. By type, the board carries 50 resistors, 25 capacitors, 8 connectors, 6 transistors, 6 transformers and 6 diodes.

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

From the project

PWM solar charge controller with USB charging port

This PWM charge controller is cheaper than the MPPT charge controllers, as it does not contain the internal powerful DC/DC converter necessary for MPPT. The lower production cost and easy manufacturing with larger SMD components makes it ideally suited for solar home systems (SHS) for rural electrification.

The design allows to use either SMD MOSFETs or TO220 THT MOSFETs, which can be easily attached to a heat sink.

Pwm-2420-lus, from the project README
From the project README

Main components on the Pwm-2420-lus

STM32L072CZTxTLV9002MC34063ADD1213A-04SOLP2950-3.3_TO252

Pwm-2420-lus bill of materials (BOM)

115 components, 42 distinct parts.

QtyPartRefs
1
STM32L072CZTx
U1
1
TLV9002
U2
1
MC34063AD
U3
1
D1213A-04SO
U4
1
LP2950-3.3_TO252
U5
3
PSMN7R5-60YLX
Q1, Q2, Q3
3
AOT266L
Q6, Q7, Q8
3
MKDS 5/ 2-9,5
J1, J2, J3
1
UEXT
J4
1
USB_A
J5
1
PWR_12V
J6
1
6P6C
J7
1
ST_Nucleo_SWD_5p
J8
1
10k
RT1
1
200mA
RT2
1
56V
RV1
5
MMBT3904
T1, T3, T4, T5, T6
1
MMBT3906
T2
3
yellow
LED1, LED2, LED3
2
green
LED4, LED5
Show 22 more
QtyPartRefs
3
12V
D1, D3, D8
2
SS14FL
D2, D9
1
1N4148
D7
1
150uH
L3
9
100n
C1, C2, C10, C11, C12, C25, C31, C32 +1
7
10n
C3, C4, C9, C17, C18, C27, C34
4
4.7u
C5, C15, C22, C33
1
180u
C6
1
330p
C7
1
470u
C8
2
1u
C13, C14
13
2.2k
R1, R4, R5, R7, R9, R12, R13, R14 +5
3
39k
R2, R22, R28
5
68k
R3, R10, R16, R19, R21
2
2m
R6, R17
5
470
R8, R33, R34, R43, R44
9
120k
R11, R15, R25, R37, R42, R46, R48, R49 +1
3
8.2k
R23, R24, R41
7
12k
R26, R27, R29, R31, R35, R39, R40
1
100R
R32
1
0.33
R36
1
0R
R38

Pwm-2420-lus design files

The KiCad project lives in the LibreSolar/pwm-2420-lus repository on GitHub; these links point at the commit this page was built from.

Pwm-2420-lus: common questions

What microcontroller does the Pwm-2420-lus use?

The Pwm-2420-lus is built around the STM32L072CZTx, from the STM32 family.

How big is the Pwm-2420-lus PCB?

The Pwm-2420-lus measures 90 × 85 mm and is 1.6 mm thick.

How many components are on the Pwm-2420-lus?

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

Where can I download the Pwm-2420-lus design files?

From the LibreSolar/pwm-2420-lus repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Pwm-2420-lus design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which LibreSolar chose for the repository.

Can I test firmware for the Pwm-2420-lus 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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