T
treez
Guest
Hello,
We are designing a 60W offline PFC’d Flyback LED driver. 240VAC input and 60V LED string.
We want our LED driver to last a long time, therefore we want to protect against transients getting coupled through the FET’s Drain_Gate capacitance and overvoltageing the gate of the FET. (IPA90R800)
We appreciate this isn’t a very common event, but we still wish to protect against it.
Therefore, we will connect a 18V zener diode at the FET gate (cathode to gate, anode to ground). The thing is, we want this zener to be as small as possible. We can pick from the following packages..SOT323, SOT23, SOD123, MELF, SMA.
Do you think that the smallest one, the SOT323, will be effective in this use? If not, which one(s) would be effective?
We are designing a 60W offline PFC’d Flyback LED driver. 240VAC input and 60V LED string.
We want our LED driver to last a long time, therefore we want to protect against transients getting coupled through the FET’s Drain_Gate capacitance and overvoltageing the gate of the FET. (IPA90R800)
We appreciate this isn’t a very common event, but we still wish to protect against it.
Therefore, we will connect a 18V zener diode at the FET gate (cathode to gate, anode to ground). The thing is, we want this zener to be as small as possible. We can pick from the following packages..SOT323, SOT23, SOD123, MELF, SMA.
Do you think that the smallest one, the SOT323, will be effective in this use? If not, which one(s) would be effective?