# Input Power Source Switching \(USB / Solar\) ## Description This project is intended to validate automatic or prioritized input source selection \(if any\), or test performance across variable solar conditions using the simulation and code tool ## Project Details - **Owner:** the\-sims - **Created:** 4/30/2025 - **Last Updated:** 4/30/2025 - **Visibility:** Public ## Key Components ### D1 — [SS34](https://flux.ai/jecstronic/ss34~8tm.md) - License: https://creativecommons\.org/licenses/by/4\.0/ - Manufacturer Part Number: SS34 - Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/ss39\-d\.pdf - Part Type: Diode - Manufacturer Name: onsemi **Pins:** - A [pin 2] - K [pin 1] ### D2 — [LED\_0603\_1608Metric](https://flux.ai/adrian95/led06031608metric~990.md) - Forward Voltage: 2\.0V - Manufacturer Name: Foshan NationStar Optoelectronics - Part Type: LED - Color: Green - License: https://creativecommons\.org/licenses/by/4\.0/ - Datasheet URL: https://datasheet\.lcsc\.com/lcsc/2008201032\_Foshan\-NationStar\-Optoelectronics\-NCD0603C1\_C84264\.pdf - Manufacturer Part Number: NCD0603C1 - Forward Current: 20mA **Pins:** - P1 [pin 1] - P2 [pin 2] ### D3 — [SS34](https://flux.ai/jecstronic/ss34~8tm.md) - License: https://creativecommons\.org/licenses/by/4\.0/ - Manufacturer Part Number: SS34 - Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/ss39\-d\.pdf - Part Type: Diode - Manufacturer Name: onsemi **Pins:** - A [pin 2] - K [pin 1] ### D4 — [SS34](https://flux.ai/jecstronic/ss34~8tm.md) - License: https://creativecommons\.org/licenses/by/4\.0/ - Manufacturer Part Number: SS34 - Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/ss39\-d\.pdf - Part Type: Diode - Manufacturer Name: onsemi **Pins:** - A [pin 2] - K [pin 1] ### D5 — [LED\_0603\_1608Metric](https://flux.ai/adrian95/led06031608metric~990.md) - Current: 20mA - Manufacturer Name: Foshan NationStar Optoelectronics - Part Type: LED - Color: Red - Manufacturer Part Number: NCD0603R1 - Datasheet URL: https://datasheet\.lcsc\.com/lcsc/2008201032\_Foshan\-NationStar\-Optoelectronics\-NCD0603R1\_C84263\.pdf - License: https://creativecommons\.org/licenses/by/4\.0/ - Forward Voltage: 2\.0V **Pins:** - P1 [pin 1] - P2 [pin 2] ### IC1 — [MT3608](https://flux.ai/vasyl/mt3608~9zt.md) - Manufacturer Name: Aerosemi Technology Co Ltd - Datasheet URL: https://datasheet\.lcsc\.com/lcsc/2201121530\_XI\-AN\-Aerosemi\-Tech\-MT3608L\_C2932326\.pdf - Manufacturer Part Number: MT3608L - Part Type: Integrated Circuit **Pins:** - EN [pin 4] - FB [pin 3] - GND [pin 2] - IN [pin 5] - NC [pin 6] - SW [pin 1] ### J1 — [JST B2B PH K 01x02 Connector](https://flux.ai/jharwinbarrozo/jst-b2b-ph-k-01x02-connector~zu5.md) - Manufacturer Part Number: B2B\-PH\-K\-S\(LF\)\(SN\) - Manufacturer Name: JST Sales America - Part Type: Connector - Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/ePH\.pdf **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### J2 — [DB125\-3\.81\-4P\-GN\-S](https://flux.ai/jharwinbarrozo/db125-3p81-4p-gn-s~l9d.md) - Part Type: Connector - License: https://creativecommons\.org/licenses/by/4\.0/ - Manufacturer Name: DIBO - Manufacturer Part Number: DB125\-3\.81\-4P\-GN\-S - Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_2304061030\_DORABO\-DB125\-3\-81\-4P\-GN\-S\_C395880\.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] ### J3 — [2\-Position Screw Terminal](https://flux.ai/corynrobinson/2-position-screw-terminal~s4.md) - Part Type: Connector - Manufacturer Part Number: WJ500V\-5\.08\-2P - Manufacturer Name: Ningbo Kangnex Elec - Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1912251636\_Ningbo\-Kangnex\-Elec\-WJ500V\-5\-08\-2P\_C8465\.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### J4 — [USB\_Micro](https://flux.ai/adrian95/usbmicro~1ej.md) - Part Type: Connector - Manufacturer Part Number: 10118192\-0001LF - Datasheet URL: https://datasheet\.lcsc\.com/lcsc/2304140030\_Yuandi\-MICRO\-03\-P1\-A1T2\_C2682528\.pdf **Pins:** - D\- - D\+ - GND - ID - VBUS ### SW1 — [SW\_SPDT](https://flux.ai/adrian95/swspdt~q2k.md) - Manufacturer Name: SHOU HAN - Datasheet URL: https://datasheet\.lcsc\.com/lcsc/2304140030\_SHOU\-HAN\-MSK12C02\_C431540\.pdf - Manufacturer Part Number: MSK12C02 - Part Type: Switch **Pins:** - A - B - C ### U1 — [RT8059GJ5](https://flux.ai/collinsemasi/rt8059gj5~n5.md) - Manufacturer Part Number: RT8059GJ5 - Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1811100910\_Richtek\-Tech\-RT8059GJ5\_C20542\.pdf - Package or Case Code: SOT\-23\-5 - SPICE Model: \* RT8059 Behavioral Model for NGspice \* Node order: VIN LX FB EN GND \.SUBCKT RT8059 VIN LX FB EN GND \* Parameters \.PARAM VUVLO=2\.3 \.PARAM VREF=0\.6 \.PARAM FSW=1\.5MEG \.PARAM ILIM=1\.5 \.PARAM RDSH=0\.28 \.PARAM RDSL=0\.25 \* ENABLE Logic B1 N\_EN GND V=IF\(V\(EN\)\>1\.5,1,0\) B2 N\_UVLO GND V=IF\(V\(VIN\)\>VUVLO,1,0\) B3 N\_ACTIVE GND V=V\(N\_EN\)\*V\(N\_UVLO\) \* Internal reference VREF N\_REF GND DC \{VREF\} \* Error amplifier output \(difference between VREF and FB\) E\_ERR N\_ERR GND VALUE=\{V\(N\_REF\) \- V\(FB\)\} \* Triangle wave: emulate using time\-based function B\_TRI N\_TRI GND V=0\.5\+0\.5\*SIN\(2\*3\.14159\*\{FSW\}\*TIME\) \* PWM comparator B4 N\_PWM GND V=IF\(V\(N\_ERR\)\>V\(N\_TRI\),1,0\) \* Current sense using a small resistor R\_SENSE LX N\_ISENSE 0\.05 B5 N\_ILIM\_OK GND V=IF\(I\(R\_SENSE\)\