d123
Advanced Member level 5
Hi,
In the below circuit, after reviewing the TPS73801 regulator datasheet, again, I am having doubts as to whether the enable pin operates (on/off) proportional to input voltage, or will function with 2V to 3V with a 6V input to the regulator. I have no problem with upping the battery voltage to 5V, if necessary, but beyond that the OPA376 may not be too happy, as max. operating voltage is 7V, and would possibly need to consider an alternative higher voltage op amp. If it says 7V absolute max. could 6V be an acceptable operating voltage for it, as it has to supply virtually no current whatsoever to the regulator input pin (1 to 30uA)?
Also, is the only simple way to forego the battery and power the reference and op amp from the panels directly by doing so with a 3V Zener - to ensure they are powered up before the regulator, even if only by microseconds? Or is there any other method?
This circuit is curiosity/theory, so if it's a needlessly complex design to turn on an LDO when input is over a specific minimum, or unworkable in some way I'd appreciate input, thanks.
In the below circuit, after reviewing the TPS73801 regulator datasheet, again, I am having doubts as to whether the enable pin operates (on/off) proportional to input voltage, or will function with 2V to 3V with a 6V input to the regulator. I have no problem with upping the battery voltage to 5V, if necessary, but beyond that the OPA376 may not be too happy, as max. operating voltage is 7V, and would possibly need to consider an alternative higher voltage op amp. If it says 7V absolute max. could 6V be an acceptable operating voltage for it, as it has to supply virtually no current whatsoever to the regulator input pin (1 to 30uA)?
Also, is the only simple way to forego the battery and power the reference and op amp from the panels directly by doing so with a 3V Zener - to ensure they are powered up before the regulator, even if only by microseconds? Or is there any other method?
This circuit is curiosity/theory, so if it's a needlessly complex design to turn on an LDO when input is over a specific minimum, or unworkable in some way I'd appreciate input, thanks.