I use this LDO in my design for filtering low frequency output noise.
I would like to change the output voltage of this LDO by the DAC.:drevil:
The output of the DAC range (0-3.3V)
The output of the LDO range (0-10V)
The feedback pin will servo to a certain internal reference value, usually 1.23V or 0.8V for low voltage types.
Wat you could do is to compare the a third of the LDO output (10 / 3 = 3.33...) to the DAC output with an opamp comparator, and then send this signal to the feedback pin instead. A low noise, rail to rail opamp like the LMV321 is recommended.
Hi ArticCynda,
thanks for your answer
the internal reference of this ldo is 1.25V typ
compare the a third of the LDO output (10 / 3 = 3.33...) to the DAC output with an opamp comparator, and then send this signal to the feedback pin instead