ricothetroll
Well-known member
Hi,
I'm currently working on designing a PSU for my guitar stompboxes. I'd like to use LM317, because of their very clean regulation and also because of their adjustability.
While reading the datasheet, I can't find any clear info about the relationship between the input current and the output current. In other words : for 1mA at the output, how much current consumed at the input ? Is it a function of (Vin-Vout) ? t the "Heatsink requirement" paragraph I can see that the power dissipated by the component is ~ (Vin-Vout) x I(load).
I'd like 7 isolated outputs, 4x 120mA 9V/12V, 2x 500mA 9V/12V and 1x 150mA 9V/12V/18V. The current rating will depend on the power trafos used, as the 317 can handle a lot more current than that. So, will my output's current capability differ depending on the output voltage ? The input voltage stays constant.
LM317's datasheet : www.national.com/ds/LM/LM117.pdf
Best regards.
Eric
I'm currently working on designing a PSU for my guitar stompboxes. I'd like to use LM317, because of their very clean regulation and also because of their adjustability.
While reading the datasheet, I can't find any clear info about the relationship between the input current and the output current. In other words : for 1mA at the output, how much current consumed at the input ? Is it a function of (Vin-Vout) ? t the "Heatsink requirement" paragraph I can see that the power dissipated by the component is ~ (Vin-Vout) x I(load).
I'd like 7 isolated outputs, 4x 120mA 9V/12V, 2x 500mA 9V/12V and 1x 150mA 9V/12V/18V. The current rating will depend on the power trafos used, as the 317 can handle a lot more current than that. So, will my output's current capability differ depending on the output voltage ? The input voltage stays constant.
LM317's datasheet : www.national.com/ds/LM/LM117.pdf
Best regards.
Eric