What is a backup power supply?
High-Efficiency Backup Power Supply A backup power supply is an electrical system that provides emergency power to a load when the main power source fails. An appropriate backup power supply provides instantaneous protection from main power interruptions without glitches, by supplying energy which is stored in backup capacitors or batteries.
What is a backup capacitor?
The objective of the circuit is to charge the backup capacitor to a programmed voltage level and provide instantaneous backup power in case of a main power interruption for a load up to 10 W. Typically, this circuit can be used for a SSD system to enable a controlled shutdown to prevent data loss in case of a main power loss.
What happens if a backup capacitor is charged to a higher voltage?
Charging the backup capacitor to a voltage level higher than the main power voltage results in a smaller backup capacitor value and smaller solution size to store the same amount of energy. The usable energy stored in the backup capacitor is only limited by the input voltage range of the buck-boost converter, which is 12 V for the TPS63060.
How does a ltc3226 backup supply work?
Figure 1 shows a typical 3.3V backup supply application in which the main power path from the input source to the load goes through the external PFET. As long as input power is available, the LTC3226 maintains the supercapacitor stack at a full 5V charge.
How do you precharge a backup capacitor on a tps63060?
Therefore, the backup capacitor must be pre-charged via a diode to the minimum operating input voltage level of the TPS63060 (typical 2.2 V). At this input voltage level, the buck-boost converter starts operating. A series resistor, R 1, is used to program the maximum pre-charge current into the backup capacitor.
What is the tps63060 backup power system?
In this design, the backup power circuit is based on the TPS63060, a highly-efficient, synchronous, single-inductor, buck-boost converter. Figure 1 shows a simplified block diagram of the circuit. Figure 1. Simplified Block Diagram of the Backup Power System
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