I have some Aliexpress regs using the 5pin Lt1963. They measure 5v out just fine but I have also measured the caps. Input caps are somewhere between 7 and 10uf over the 5 regs I bought which is within spec of the LT datasheet.
However the output caps are woefully under sized and measure 80nf.....0.08uf.
Should I replace with a new 0805 >10uf X5R.
Or parallel an electrolytic and maybe also a 0.1uf film over the existing 80nf.
Or is there a better alternative.? Won't be drawing much current. They will be powering individual dac chip rails
Thanks
However the output caps are woefully under sized and measure 80nf.....0.08uf.
Should I replace with a new 0805 >10uf X5R.
Or parallel an electrolytic and maybe also a 0.1uf film over the existing 80nf.
Or is there a better alternative.? Won't be drawing much current. They will be powering individual dac chip rails
Thanks
I used 10uF 16V 0805 DigiKey # 1276-6455-1-ND in my little preamp and was not expecting the capacitance
to drop as the Voltage goes up. The capacitance goes down by more than half. Just something to be aware of.
G²
to drop as the Voltage goes up. The capacitance goes down by more than half. Just something to be aware of.
G²
LT1963 is my favorite OEM poz regulator, but noting this, the ESR of the output cap plays a huge role in stability.
By sweeping the load current one can judge the stability of a regulator with feedback. This example assumes a 10uF with ESR of 1milliOhm, 100milliOhms and 1 Ohm:
By sweeping the load current one can judge the stability of a regulator with feedback. This example assumes a 10uF with ESR of 1milliOhm, 100milliOhms and 1 Ohm:
Attachments
The factory datasheet seems clear....
https://www.analog.com/media/en/technical-documentation/data-sheets/1963fc.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/1963fc.pdf