Hello,
We intend to use TPS61170 to step-up voltage in order to store energy in a bulk capacitor. This capacitor will be from 3300uF to 6800uF and output voltage will be from 20V to 38V, we have not decided this yet. The input voltage can range from 9V to 15V.
The energy stored will be eventually used by a buck-boost regulator in the case of input efuse opens. The application is pretty similar to your TIDA-00304 reference design. We intend to use TP25942A or TPS259271.
The regulator may be turned off when capacitor is charged and then turned on if voltage falls below some level or if stored energy is used. Normally there will be no load to the regulator output, besides bulk capacitor.
Do you recommend any special caution which is not described in TPS61170 datasheet?
For compensation network, the usual calculations consider the existence of a resistive load and a much smaller capacitance. How can I calculate compensation network in this case of high output capacitance and no resistive load?
Any doubt or additional consideration?
Observation: In TIDA-00304 schematics (link below), there is a capacitor connected to TPS61170 SW pin (C1). With this capacitor the configuration is neither boost nor sepic. Is that right or is it an error? If it's right, how does this configuration work?
Thanks!
