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programmable voltage source design

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EDA_hg81

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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?:cry:

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IanP

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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) ..
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IanP
 

    EDA_hg81

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EDA_hg81

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Thank you for your reply.

But I am wondering if the accuracy can be met?

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IanP

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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 ..

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IanP
 

    EDA_hg81

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