Hi, What is the best way to trim the output voltage(1.0V) by +/-5% ? Can the Vo_adj accept voltage source override, with what drive strength?
Thanks,
Meng
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Hi, What is the best way to trim the output voltage(1.0V) by +/-5% ? Can the Vo_adj accept voltage source override, with what drive strength?
Thanks,
Meng
Hello Denislav,
Thank you very much. It seems it would be easier to switch the Rset value to trim the Vo.
Meng
Hi Denislav,
I thought about the switching Rset method for trimming the Vo. I can see that there will be discontiunity (break-before-make) during the Rset swithing. Would you know how sensitivty the Vo to the Rset switching discontiunity if trimming the Vo from 1.0V (63.7k) to 0.97V (Rset=71.5K), and then 0.95V (77.79k)?
Thanks
Meng
Hi Meng,
I think it would be good to always have a resistor connected for one Vout value and achieve the trimming by switching in parallel combinations. That way you won't risk having an open circuit on the pin and Vout defaulting to Vref.
For example, you could have a default resistor always installed for the lowest voltage (0.95V) and switch in large resistors in parallel so that you get a parallel combinations resulting in 0.97V and 1V out.
If the switches are open, then you will get a default of 0.95V always.
Let me know if this makes sense.
Cheers,
Denislav