Why is shunt voltage reference not outputting the right voltage?

Thread Starter

BrokenPin

Joined Oct 1, 2023
11
Hello,

I have used LM4040C10IDBZR shunt voltage reference to produce 10V from +15V but it is actually outputting 9.4V? this voltage needs to be a stable 10v.
to be honest I don't remember why I chose to put exactly 312ohm in there or if should i put a like voltage divider that makes 10v output and then add the shunt voltage reference in parallel.
what is making the output less than 10v?
1700402198816.png

Any help would be appreciated.
Thanks
 

MrChips

Joined Oct 2, 2009
30,488
Why is the op-amp driving the “voltage divider”?
What is on the left side of the circuit off the picture?

Show us the complete schematic.
 

WilkoL

Joined Nov 19, 2023
1
Hello,

I have used LM4040C10IDBZR shunt voltage reference to produce 10V from +15V but it is actually outputting 9.4V? this voltage needs to be a stable 10v.
to be honest I don't remember why I chose to put exactly 312ohm in there or if should i put a like voltage divider that makes 10v output and then add the shunt voltage reference in parallel.
what is making the output less than 10v?
View attachment 307913

Any help would be appreciated.
Thanks
Is R5 really 312 ohm? With 5V over is there would be a current of 16 mA why so much? According to TI max current for the LM4040 is 15 mA.
 
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