Hello everybody,I,tried to build a dc-dc boost converter for powering my laptop in the car, so 12v to 19V.
So i used this schematic, pcb layout and the signal on the mosfet drain looks like that.
Coil is made with an E+I core from a ATX PSU with gap appx 0.4mm.
Those spikes are aproximately 55v p-p and i reduced them to about 50v with a sunbber (100nF+4.7ohm).
What did i do wrong? is the pcb that bad that is causing these oveshots?
I almost forgot: the spikes are 55v p-p when i draw 1.6amps at output . They increase as i draw more current and obviously decrease if i draw less current.
Edit: added ext links to bigger pics
PCB
schematic
Spikes
So i used this schematic, pcb layout and the signal on the mosfet drain looks like that.
Coil is made with an E+I core from a ATX PSU with gap appx 0.4mm.
Those spikes are aproximately 55v p-p and i reduced them to about 50v with a sunbber (100nF+4.7ohm).
What did i do wrong? is the pcb that bad that is causing these oveshots?
I almost forgot: the spikes are 55v p-p when i draw 1.6amps at output . They increase as i draw more current and obviously decrease if i draw less current.
Edit: added ext links to bigger pics
PCB
schematic
Spikes
Attachments
Last edited: