The new generation UltraCap LPS-1.2: USER IMPRESSIONS and QUESTIONS thread

[tims]

To those that have the new LPS-1.2 and also the LPS-1.0,  I'd be interested in a head to head comparison between these two especially now the 1.2 is using the LT3045 regulator.

[tims]

4 hours ago, JohnSwenson said:

Whenever you have a single supply powering two loads you can have a situation where changes in load current from one device cause a small change in voltage on the supply output, and those voltage changes are seen by both devices powered by the supply. So yes it is always possible powering each device with its own supply might sound better than both off the same supply, but the LPS-1.2 has an extremely low output impedance, so any voltage change due to load current changes are going to be VERY small. Thus the LPS-1.2 is probably one of the best supplies out there for powering multiple loads (as long as the combination doesn't go over 1.1A)

 

There is a special issue with the ISO REGEN. It contains an isolation circuit whose purpose in life is to prevent leakage current from traveling through a USB cable. If you power the ISO REGEN and the upstream device from the same power supply you are bypassing this isolation. This may or may not be an issue depending on what is driving the ISO REGEN and how things in your system are connected. It is hard to make a determination without knowing the details of the system. Note: the isolation is not the ONLY reason for an ISO REGEN, even with the isolation bypassed it can still significantly improve your USB signal.

 

John S.

Hi John

 

If you are powering both the ISO REGEN and an upstream device (as discussed above using a single LPS-1.2) but this time have (for instance) two ldovr LT3045 regs (http://www.ldovr.com/product-p/lt3045-m.htm) after the LPS-1.2 (with the LPS-1.2 feeding both ldovr regs).

Would this setup now provide the necessary isolation to prevent leakage currents as the ISO REGEN and the other device now have their own separate ldovr power supplies or doesn't it work like this?

 

Thanks