Input power protection is missing + 12V dash light input protection is suspect - Githubissues

whitfijs-jw / Volvo240-DigitalDash

Volvo 240 Digital Dash Project. It's not much, but its honest work.

MIT License

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Input power protection is missing + 12V dash light input protection is suspect #47

Open whitfijs-jw opened 1 year ago

whitfijs-jw commented 1 year ago

Switched 12V from VSS connector to power supply is unprotected from reverse polarity and load dump. Options:

Big (5-7kW) unidirectional TVS diode to to cover both situations. Main goal is to limit load dump voltage spike to be within the voltage range of the power and other inputs. (https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_sld8s_datasheet.pdf.pdf)
Bidirectional TVS diode for load dump and schottky diode for reverse voltage protection.

12V input protection is a little more open ended.