Need help with a high voltage DC (< 60V) circuit

by JimBOBison
December 07, 2023

There is no question.

Here a working solution AND simulation. I added an alternative voltage source and the simulation is performed in time domain.

by vanderghast
December 08, 2023

Sorry - couldn't get the question to post last night and I ran out of time. I only get about 3 Vdc out. Input is at about 58 Vdc coming off the rectifier. Question: am I burning out the LM317 HV with an over-voltage spike when I am turning the circuit on? I'm not sure how susceptible the device is to anything over its 60 input voltage limit.

by JimBOBison
December 09, 2023

Accordingly to TI datasheet, the LM317HV has some overheating and over current protection, but that is of a use within the maximum limit.

The recommended limit is the limit to not exceed to keep the expected life span for the device, while the maximum limit is about the integrity of the device itself, while some of its characteristics may be modified.

If you are concerned about the device, try a TVS (Transient Voltage Suppression Diode), or other similar protection.

by vanderghast
December 09, 2023

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