ZHCU710 October 2019
Figure 1 shows the block diagram of TIDA-050033. It uses a super capacitor as the energy storage cell. When VBUS exists, the PLC module is powered by Vbus and the super capacitor is charged by a linear charger. The super capacitor will be charged to 2.5 V. The synchronous step-down DC-DC converter TPS560430 will generate a 3.3 V dc voltage as MCU power supply and TLV61048 external bias. When Vbus fails (Vbus < 12 V), boost converter TLV61048 starts switching and provides a 12 V seamlessly to supply the PLC line driver amplifier