Hey all,
I've recently used an LM431 because I needed a 5.00V reference voltage. According to the datasheet (**broken link removed**), to set the voltage output of the LM431, there is basically a voltage divider.
I'm wondering if the stability of the LM431 is basically dependent on the stability of my power supply, since the voltage divider that sets the output voltage hangs off the positive rail of my power supply.
Maybe this isn't the correct application for the LM431, but I would like the 5.00V stability to be better than my powersupply. Otherwise, why wouldn't I just set a trimpot to 5V and send it through an op-amp buffer for my 5V reference?
Attached is a screenshot of the LM431 in my schematic.
Mike
I've recently used an LM431 because I needed a 5.00V reference voltage. According to the datasheet (**broken link removed**), to set the voltage output of the LM431, there is basically a voltage divider.
I'm wondering if the stability of the LM431 is basically dependent on the stability of my power supply, since the voltage divider that sets the output voltage hangs off the positive rail of my power supply.
Maybe this isn't the correct application for the LM431, but I would like the 5.00V stability to be better than my powersupply. Otherwise, why wouldn't I just set a trimpot to 5V and send it through an op-amp buffer for my 5V reference?
Attached is a screenshot of the LM431 in my schematic.
Mike