programmable voltage source design

[EDA_hg81]

I am going to design a programmable voltage source, the requirements is output is +/- 15VDC, 50 mA continuous 0.04%+100uV accuracy.

But current DAC chips only can output +/- 10VDC, what I can do with it?

Thank you.

 

[IanP]

You can always use an opamp in non-inverting configuration and 1.5 x gain (10V x 1.5 = 15V), supply it from +/-18Vdc (or more) and boost its output current with two external transistors (NPN-PNP) ..
Regards,
IanP

 

[EDA_hg81]

Thank you for your reply.

But I am wondering if the accuracy can be met?

Thank you.

 

[IanP]

If you use high-precision resistors to set the gain and precision opamp (for example LTC1050 or OP177) I can't see any reason why the accuracy couldn't be met ..

Regards,
IanP