Would the Li-ion Power Pack-Charger function as a UPS?

Mickster

I would like to keep my Prop-device alive in the event of a power failure or brownout but I'm not sure if this particular circuit is intended to work in this fashion.

Regards,

Mickster

SRLM

From the datasheet:

The circuit in Figure 7 operates as an uninterruptable power supply. All that is needed is the addition of
a couple of diodes and an appropriately sized capacitor. When charging power is available, the cells are
taken out of the circuit and they are being charged. That same charging input power is available through
the Raw Power Output jack to power an application.
Figure 7
When the Charging Input Power is no longer available (for example, a solar panel at night), the Cell
Power Output jack is activated. There will be a switch-over period, so be sure to use a capacitor large
enough to span that time.
To minimize the diode’s voltage drop, you could use a device like the STPS40L15CT which is designed
especially for applications like this.

Matt Gilliland

Hi Mickster-
Thanks SRLM - you're right on

The device is designed to be pretty versatile - check out the last few pages of the Product Doc. There's several schematic Application Notes that show how to create a few different power delivery/source options. In particular, Figure 7.

I like to think of it as a "Wall-wart Transformer Power Supply", only without the Wall and without the Transformer.

-Matt

Mickster

So the moral of this thread: RTFM ....Doh!

Thank you.

Mickster