Heater Voltage too much?

[jan.didden]

Jan, irrespective of real or imagined, is this scenario something a slow start circuit would mitigate?
Thanks.

I think it would. But indeed, I have no idea how relevant it is; the phenomenon as such should be real as it depends on non-negotiable physics.

Jan

 

[57786]

I think it would. But indeed, I have no idea how relevant it is; the phenomenon as such should be real as it depends on non-negotiable physics.

Jan

And for the sake of a transistor, resistor and cap - I'm happy to follow the TI LM317 datasheet for 'soft-start' over 4 secs or so.
Kind regards.

 

[Rod Coleman]

Where does any data sheet say this?

It's already here on this thread, in the screenshot of the E180F data sheet. Post 47.

"The average heater voltage should be 6.3V"

Please read the rest of the Philips E180F data sheet to see the context of the 10000 hour lifetime and end-of-life criteria, of which the heater voltage forms part.