Hello!
I would like build a UPS with only 1 cell of Li-Ion battery (max. 4.2V) or supercapacitor (max. 2.7V). System bus would be 5V.
According to the datasheet the minimum voltage on Vin should be minimum 4.5V, so I can't use the Vin side of the dcdc converter for the battery, as discribed in "Design Considerations for a Bidirectional DC/DC Converter" white paper.
Is it possible to swap the sides, and use the Vout side of the controller for the battery (min. 0.8V is low enough), and Vin for the system bus?
Thanks for help in advance.
Br,
Zoltan
Hi,
What's your output /load requirement (v& I).
Figure 3 shows the four-switch buck-boost converter operation modes and waveforms controlled by the ISL81601. When Vin is lower than Vout, it runs in boost mode, as shown in Figure 3C. When Vin is higher than Vout, it runs in buck mode, as shown in Figure 3A. When Vin is close to Vout, it runs in buck-boost (one cycle buck followed by one cycle boost) mode as shown in Figure 3B .
Also As per flow of charge & discharge . Vin to Vout is buck converter & Vout to Vin boost converter . If you connect battery at output side you will get boost voltage at input side . & vice versa.
Thanks
AB
Thanks for the answer.
So as I understood, it is possible to use the Output for battery charging/discharging. Is it means that I simply mirror the circuit, which is in Figure 6 of "Design Considerations for a Bidirectional DC/DC Converter" white papaer?