Hello,
Thanks for your support in this forum.
Currently I have a couple of PCB that I need to provide a double input power supply. The specs for this couple of PCB are Vin= 9 to 17.5V. (12V nominal), consumption is about 18-24W/each (working mode dependant).
Long cable runs and hot plugging could induce transient voltage spikes which may exceed the input voltage limit and I need to protect it.
By other hand, the system will have 2 VDC inputs, and will be capable to have a hot-swap between them. As you can see in the attach schematic, the 2 Scotty diodes allow to do this.
finally, the input battery used could provide up to 16.8V (max).
I am looking for a TVS Diode (see it in the attach file).The problem I am facing is about the specs in TVS diodes. Vclamp should be 17.5V, but then, Vr and Vbr are too low.
Any idea how to solve this short margin between Vr/Vbr and Vclamp? Could I place a Zener to clamp it to 17.5V?
Any tip will be welcome.
Thanks for your support in this forum.
Currently I have a couple of PCB that I need to provide a double input power supply. The specs for this couple of PCB are Vin= 9 to 17.5V. (12V nominal), consumption is about 18-24W/each (working mode dependant).
Long cable runs and hot plugging could induce transient voltage spikes which may exceed the input voltage limit and I need to protect it.
By other hand, the system will have 2 VDC inputs, and will be capable to have a hot-swap between them. As you can see in the attach schematic, the 2 Scotty diodes allow to do this.
finally, the input battery used could provide up to 16.8V (max).
I am looking for a TVS Diode (see it in the attach file).The problem I am facing is about the specs in TVS diodes. Vclamp should be 17.5V, but then, Vr and Vbr are too low.
Any idea how to solve this short margin between Vr/Vbr and Vclamp? Could I place a Zener to clamp it to 17.5V?
Any tip will be welcome.
Attachments
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