4 layers146 × 96 mm
Poc lev
Rithvik-Vadlamani/guadaloop-power-electronics
Selected Guadaloop power-board and levitation H-bridge designs and review packages
74 parts
2 layers39.4 × 39.4 mm
Soft start
open-pe/soft-startSoft-start to limit inrush and protect battery connectors
- Size
- 39.4 × 39.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 12
- Pads
- 49
- Tracks, vias
- 135, 8
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 2 Oct 2022
- Updated
- 27 Mar 2023
Overview
Soft start is an open-source printed circuit board by open-pe, from the open-pe/soft-start repository on GitHub, published under the MIT licence. It is a 2-layer board of 39.4 × 39.4 mm with 21 parts on 12 nets, routed with 135 tracks and 8 vias.
It is built around the LM393, 10D-7 and IRF100B201. Its parts include 6 resistors, 3 capacitors, 2 ICs, 2 transistors and 1 diode. It belongs with the power boards of this library.
Main components
3
LM393
SOP-8-16V~16V 0℃~+70℃ 2 2.5mA 250nA 2V~36V 36V 5mV 5nA Fail-safe function Open-drain SOP-8 Comparators ROHSMSKSEMIComparators10D-7
插件,P=5mm-40℃~+150℃ 10Ω 1A 2700K 5mm 9mW/℃ 插件,P=5mm NTC Thermistors ROHSSURGINGNTC Thermistors
IRF100B201
TO-220AB-55℃~+175℃ 1 N-channel 100V 192A 255nC@10V 310pF 4.2mΩ@10V 441W 660pF 9.5nF N-Channel TO-220AB MOSFETs ROHSInfineon TechnologiesMOSFETs
README
README.mdSimple soft start circuit with power MOSFET and NTC. It is designed to limit in-rush current of a DCDC converter connected to a battery with XT90i (like XT90 + 2 signal pins) connectors. The additional signal pin makes sure that the circuit resets after the connector is unplugged. Otherwise, it can be powered by the input capacitor of the load and doesn't "know" that the battery power is lost. Because battery voltage changes with battery SoC, absolute voltage at load input cannot tell wether the input capacitance is fully charged.
The 78L15 is the power supply for MOSFET driving and is a reference voltage at the same time. Q2 protects the NTC from long current exposure if the connector is plugged in to slowly or not properly. The comparator switches on once the voltage drop accross the NTC falls below the value defined by the potentiometer and R1,R2. With the given resistor values, the circuit works with battery voltage upto 60V. Note that 78L15 max input is 30V.
You can omit and short Q2 if you dont use a seperate power supply for circuit.
NTCs https://datasheetspdf.com/pdf/814993/EXSENSE/NTC-10D7/1
MOSFETS
- IPP024N08NF2SAKMA1 (80V, 2.4mohm, Id100 139A)
- IRF100B201 (100V, 4.2mohm, Id100 136A)
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C3 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R5 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 1 | 0.47u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 10D-7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | TH1 |
| 1 | 1meg | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 200k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | 2k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | IRF100B201 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | Q1 |
| 1 | IRF100B201 | Package_TO_SOT_THT:TO-220-3_Vertical | Q2 |
| 1 | L78L15_TO92 | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | LM393 | Package_DIP:DIP-8_W7.62mm | U2 |
The 17 most common of 21 parts.
Questions
How big is the Soft start PCB?
It measures 39.4 × 39.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Soft start use?
21 parts, built around the LM393, 10D-7 and IRF100B201. 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 Soft start KiCad files?
From the open-pe/soft-start repository on GitHub, at the commit this page was made from: the board is softstart.kicad_pcb and its schematic softstart.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Soft start design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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