2 layers82 × 52 mm EmoePower V1.0, the printed circuit board in 3D

EmoePower V1.0

A DIY Buck-Boost Power Supply for Laboratory works and personal use, based on LM5175 and ESP32.

Size: 82 × 52 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 72
Nets: 45
Pads: 228
Tracks, vias: 254, 154
Pours: 18
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 25 Jan 2021
Updated: 29 Jan 2021

Overview

EmoePower V1.0 is an open-source printed circuit board by emoestudio, from the emoestudio/EmoePower repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 82 × 52 mm with 72 parts on 45 nets, routed with 254 tracks and 154 vias.

It is built around the LM5175PWPR, MAX4080TASA+ and MAX907CSA+, with the IRLR8726TRPBF and MBR0520L-TP among its other parts. Its parts include 23 capacitors, 18 resistors, 4 diodes, 4 transistors and 4 connectors. It belongs with the power boards of this library.

Main components

README

README.md

Overview

This is a pocket-sized, IoT-ed Power Supply.

It's final goal is to meet EEers' daily usage requirements:

Small Sized
Programmable Voltage and Current settings
High Efficiency
High Reliability
High precision
Multiple control method
Modernized GUI

This project is still under development and test.

V1.0 PCB

img_front img_back

LM5175 Parameter Configuration & Calculation

Design Requirements	Calculated Value
Input Voltage Range	20V ~ 24V
Output Range	0.8V(Minimal) ~ 24V
Load Current	0 ~ 4A(0-12V),0 ~ 2A(12-24V)
Switching Frequency	about 300KHz
Mode	CCM & Hiccup On

Frequency Calc

$R_T = {{{1 \over F_sw}-200ns} \over {37pF}}$

Finally get Rt = 84.5kΩ and we select standard value, that is 82kΩ.

Inductor Selection

$L_{BUCK} = {({{V_{IN(MAX)}-V_{OUT})*V_{OUT}}} \over {0.4*I_{OUT(MAX)}*F_{SW}*V_{IN(MAX)}}}$

In most cases, circuit works in BUCK mode, so choose a most-common used voltage range, and calculate its L, finally we get L is about 10uH.

And the maximum average inductor current occurs at the minimum input and maximum load current:

$I_{L(MAX)} = {{V_{OUT}*I_{OUT(MAX)}} \over {0.9*V_{IN(MIN)}}}$

$I_{L(PEAK)} = I_{L(MAX)} + {{V_{IN(MIN)}*(V_{OUT}-V_{IN(MIN)})} \over {2*L_1*F_{SW}*V_{OUT}}}$

And Saturation current should be higher, about 1.5xIL, about 20A.

Finally we choose two 1265 4.7uH in series.

What's left...

Please refer to ti's docs

Parts

Qty	Value	Footprint	References
9	0.1uF	Capacitor_SMD:C_0603_1608Metric	C4, C7, C10, C15, C18, CBoot1, CBoot2, Css1, Css2
5	0	Resistor_SMD:R_0805_2012Metric	R13, R14, R15, R16, R17
5	10uF	Capacitor_SMD:C_1206_3216Metric	C11, C12, C13, C14, C16
5	4.7uF	Capacitor_SMD:C_1206_3216Metric	C3, C5, C6, C8, C9
4	IRLR8726TRPBF	Package_TO_SOT_SMD:TO-252-2	Q1, Q2, Q3, Q4
3	10	Resistor_SMD:R_0603_1608Metric	R3, R5, R6
3	100	Resistor_SMD:R_0603_1608Metric	R1, R2, R9
2	10k	Resistor_SMD:R_0603_1608Metric	R4, Rc1
2	20k	Resistor_SMD:R_0603_1608Metric	R8, R11
2	4.7uH	Inductor_SMD:L_Wuerth_HCI-1365	L1, L2
2	50V 220uF	Capacitor_SMD:CP_Elec_10x10.5	C17, C19
2	MBR0520LT	Diode_SMD:D_SOD-323	D2, D3
1	100pF	Capacitor_SMD:C_0603_1608Metric	Cc2
1	180k	Resistor_SMD:R_0603_1608Metric	R10
1	1n4007	Diode_SMD:D_SMA	D1
1	22nF	Capacitor_SMD:C_0603_1608Metric	Cc1
1	240k	Resistor_SMD:R_0603_1608Metric	Ruv2
1	25m	Resistor_SMD:R_2512_6332Metric_Pad1.40x3.35mm_HandSolder	R_SENSE2
1	280k	Resistor_SMD:R_0603_1608Metric	R7
1	4.7k	Resistor_SMD:R_0603_1608Metric	R12
1	470pF	Capacitor_SMD:C_0603_1608Metric	C_Slope1
1	47pF	Capacitor_SMD:C_0603_1608Metric	C2
1	50V 100uF	Capacitor_SMD:CP_Elec_8x10.5	C1
1	56k	Resistor_SMD:R_0603_1608Metric	Ruv1
1	82k	Resistor_SMD:R_0603_1608Metric	R_T1
1	8m	Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder	R_SENSE1
1	93.1k	Resistor_SMD:R_0603_1608Metric	R_Mode1
1	DAC	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J2
1	LED	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	D4
1	LM5175PWP	Package_SO:HTSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP3.4x9.5mm_ThermalVias	U2
1	LOGO	Logo:emoe_qrcode_22x22mm	G***
1	LOGO	Logo:texas_instruments	G***
1	LOGO	Logo:emoe	G***
1	MAX4080T	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U3
1	MAX907	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U4
1	MP1584-3A	DC-DC Modules:MP1584	MP1584-5.0
1	Mode_Switch	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J3
1	PWR_IN	Connector_JST:JST_VH_B2P-VH-B_1x02_P3.96mm_Vertical	J1
1	PWR_OUT	Connector_JST:JST_VH_B2P-VH-B_1x02_P3.96mm_Vertical	J4

The 71 most common of 72 parts.

Questions

How big is the EmoePower V1.0 PCB?

It measures 82 × 52 mm and has 2 copper layers, 1.6 mm thick.

What parts does the EmoePower V1.0 use?

72 parts, built around the LM5175PWPR, MAX4080TASA+, MAX907CSA+ and IRLR8726TRPBF. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the EmoePower V1.0 KiCad files?

From the emoestudio/EmoePower repository on GitHub, at the commit this page was made from: the board is Hardware_Kicad/EmoePower_V1.0.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the EmoePower V1.0 design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Power

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/emoestudio-emoepower" title="EmoePower V1.0 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/emoestudio-emoepower.jpg" alt="EmoePower V1.0" width="1200" height="900">

A picture that opens the board, for a README

[![EmoePower V1.0](https://pcbkit.io/embed/boards/emoestudio-emoepower.jpg?size=s)](https://pcbkit.io/boards/emoestudio-emoepower)

Source

Repository: emoestudio/EmoePower
Board file: Hardware_Kicad/EmoePower_V1.0.kicad_pcb
Commit: b5c24c6
Licence: GPL-3.0

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