pjohn
Newbie level 6
Hi,
I am designing a circuit, in which the signal level rises to the maximum of 24V, but there is a potential that somebody can wire 230VAC to the input supply instead of 24V. I need to design a protection circuit that uses SMD parts to create the protection from 230VAC.
The circuit I designed included a resistor of 100 ohm, with PTC in series and two TVS diodes (BR Voltage > 24V), PTC to Ground, , but this does not work as inrush current is too high and switching time of the PTC is high. This burns of my 100 OHM resistor.
Please suggest me a circuit that I can utilize. I do not mind using a dedicated IC.
Thanks in Advance.
I am designing a circuit, in which the signal level rises to the maximum of 24V, but there is a potential that somebody can wire 230VAC to the input supply instead of 24V. I need to design a protection circuit that uses SMD parts to create the protection from 230VAC.
The circuit I designed included a resistor of 100 ohm, with PTC in series and two TVS diodes (BR Voltage > 24V), PTC to Ground, , but this does not work as inrush current is too high and switching time of the PTC is high. This burns of my 100 OHM resistor.
Please suggest me a circuit that I can utilize. I do not mind using a dedicated IC.
Thanks in Advance.
