Hello fellas. I am new here and maybe you can help me.
I'll get to the point:
I have an LM338, a 5A version of LM317. It works well, but I want to do a few more wild things with it. It appears that this regulator is capable to do much more than what is stated in the data sheet.
Here's my goal: An LM338 whose voltage will be controlled via a microcontroller. But I do not want to use a digital pedometer. Rather, I was thinking of using a DAC and feed the output voltage (1-5) from the DAC into the opamp voltage multiplier and then feed it into the adjust pin.
So far.... it works well. At the moment I have a voltage divider that feeds into the opamp and via the voltage follower, the ouput feeds into the adjust pin with 120 ohm connected to the output. The schematic is attached.
So far everything works as expected, except that the minimum voltage is ~2.5. Can anyone advise me how I can make this voltage lower, lets say down to 1.2V?? Thanks much!!!
I'll get to the point:
I have an LM338, a 5A version of LM317. It works well, but I want to do a few more wild things with it. It appears that this regulator is capable to do much more than what is stated in the data sheet.
Here's my goal: An LM338 whose voltage will be controlled via a microcontroller. But I do not want to use a digital pedometer. Rather, I was thinking of using a DAC and feed the output voltage (1-5) from the DAC into the opamp voltage multiplier and then feed it into the adjust pin.
So far.... it works well. At the moment I have a voltage divider that feeds into the opamp and via the voltage follower, the ouput feeds into the adjust pin with 120 ohm connected to the output. The schematic is attached.
So far everything works as expected, except that the minimum voltage is ~2.5. Can anyone advise me how I can make this voltage lower, lets say down to 1.2V?? Thanks much!!!
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