Main parts of the VFD power supply: inverting buck-boost converter on TPS54360 (supposed to use with ICs like PT6311 and etc) and filament driver on LM4871.
Inverting converter:
- Input voltage: 5V
- Output negative voltage: -15V to -30V
- Output current: 250mA @ 5V in
Filament driver:
- Input voltage: 5V
- Output voltage: 5 to 0 (dummy resistors to regulate)
- Output power: 2W @ 5V in
Schematic and pcb layout created in KiCad 6 Nightly Build (compatible with KiCad 5).
miscfolder contains some calculation and simulation sheets for several IC to get negative voltages