Supercapacitor backup power supply for E-Meters reference design
PMP30528
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Key Document
- Supercapacitor backup power supply for E-Meters reference design
(PDF 1724 KB)
06 Mar 2019
Description
This reference design automatically provides back-up voltages to an E-Meter during a power interruption. While the input voltage is between 10 V to 12 V, two buck controllers (TPS62147, TPS62173) generate 3.9 V at 2 A and 5 V at 150 mA. An optional synchronous boost generates 3.3 V at 50 mA. A discrete charge circuit charges a supercapacitor with a constant current up to an adjustable voltage of 2.7 V. When the input voltage fails, a synchronous boost takes over and boosts the supercap voltage to 3.9 V. The supercap capacitance and voltage defines the energy, which is available for the backup. The design enables a stable backup output of 3.9 V at 200 mA for about 70 s until the output voltage drops.
Features
- Seamless transition between mains power and back-up operation
- Designed to support high output power RF communications such as LTE, NB-IOT, or wireless MBUS or 6LoWPAN
- Single supercapacitor design to minimize system cost
- Discrete constant current supercapacitor charger
- Complete tested design with available design files and test report
See the Important Notice and Disclaimer covering reference designs and other TI resources.