Texas Instruments | Supercapacitor backup power supply with TPS63802 | Application notes | Texas Instruments Supercapacitor backup power supply with TPS63802 Application notes

Texas Instruments Supercapacitor backup power supply with TPS63802 Application notes
Supercapacitor backup power supply with TPS63802
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. Such backup power supplies are typically
used to protect hardware such as telecommunication
equipment, solid-state drives (SSDs), storage systems,
industrial equipment, or other electrical equipment,
where an unexpected power disruption can cause
malfunction or data loss.
Normal operation
Main
power
Reverse
blocking
Pre-charge
operation
Syste
System
m
Figure 2. Pre-charging and charging cycle
Charge operation
TPS63802
+
Active Cell
Balancing
Backup
Backup operation
+ Capacitor
Figure 1. Simplified block diagram
The solution with TPS63802 uses the same principle
as the reference design PMP9766. In this application,
TPS63802 is used to charge the backup capacitor as
long as the main power supply is available. When the
main power fails, TPS63802 automatically supplies the
system with the stored energy out of the backup
capacitor.
Figure 3. Backup operation
The report describes the feasibility of a backup power
supply implementation with TPS63802. It also lists the
benefits of using TPS63802 over TPS63020. Detailed
description and implementation of the circuit used for
the measurements can be found in the application
report SLVA726.
Due to the lower minimum VIN and higher efficiency of
TPS63802, the backup operation time can be
improved by 10% compared to TPS63020. Another
clear benefit for TPS63802 is the reduced solution size
due to 50% smaller package and 3x less minimum
output capacitance.
The simplified block diagram in Figure 1 shows the
implementation with TPS63802. This setup was used
to perform the following tests with a main power
voltage of 3.3 V and a constant load of 0.4 A.
Table 1 summarizes the test results and highlights
further benefits of TPS63802.
Figure 2 and Figure 3 show the Pre-charging and
charging cycle and backup operation.
SLVAE52 – January 2019
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Supercapacitor backup power supply with TPS63802
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Table 1. Device comparison and benefits
1
Parameter
TPS63020
TPS63802
Solution size
3 mm x 4 mm QFN package
COUT 3x 22 µF (0603)
2 mm x 3mm QFN package
COUT 1x 22 µF (0603)
VIN range
1.8 V to 5.5 V
1.3 V to 5.5 V
Efficiency
good at high load
good at high load and improved at low load
Charging Time
15.7 s
15.9 s
Backup Time
9.6 s
10.7 s
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Supercapacitor backup power supply with TPS63802
Copyright © 2019, Texas Instruments Incorporated
SLVAE52 – January 2019
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