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Typical Performance
17
SLVUAY1 – November 2017
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Copyright © 2017, Texas Instruments Incorporated
TPS5516xQ1-EVM Evaluation Module for 1-A Single-Inductor Buck-Boost-
Converter
4.3
Switch Node Waveforms in Buck Mode, Boost Mode, and in Buck-Boost Mode
The following graphs show the switch-nodes in the various modes. The modes are determined by the ratio
of input voltage to output voltage. In buck mode and boost mode, the device switches at 2 MHz. In buck-
boost, both nodes switch interleaved, resulting in a 1-MHz switching frequency per node.
Figure 28. Switch-Nodes in Buck Mode (V
VIN
= 12 V, V
VOUT
=
5 V)
Figure 29. Switch-Nodes in Buck-Boost-Mode (V
VIN
= 5 V,
V
VOUT
= 5 V)
Figure 30. Switch-Nodes in Boost Mode (V
VIN
= 2.5 V, V
VOUT
= 5 V)
