Can't draw enough current from Analog Discovery 3

[Aykut]

Hi, I want to test a device while powering it with wavegen. Device specifications indicates 800mA with AUX but I do not think it gives that much. I tested the device with other supplies and it draws 700mA max but I cannot power it enough with analog discovery 3, I do not think there is a problem with connections etc. I can get 5V but It cannot power the device. Am I doing something wrong? Kinda new using the Analog Discovery 3, so thanks for any advice.

[JColvin]

Hi @Aykut,

What voltage are you attempting to get your 800 mA at? As per the Specifications, https://digilent.com/reference/test-and-measurement/analog-discovery-3/specifications#programmable_power_supply, the real limit is 2.4 W per channel, as you'll start running into thermal dissipation problems after that point. At 3 V, this is where you'll be able to get up to 800 mA output (achievable with an auxiliary power supply) before hitting that 2.4 W limit.

What sort of power supply are you using to power the Analog Discovery 3, and within the Supplies instrument, what do you have the Hardware Power Limit set to? As mentioned in the Reference Manual, https://digilent.com/reference/test-and-measurement/analog-discovery-3/reference-manual#power_supplies, the value listed is the overall limit for the supplies hardware circuitry.

Thanks,
JColvin