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Appendix A
Out of Phase Synchronization of I/O and Core
SWIFTE Family Regulators
This chapter provides additional information about the TPS54x80EVM-228.
If the core and I/O voltages are provided by the two dc/dc regulators running
at a slightly different frequencies with the same input power supply, their input
voltage ripple always includes a low frequency harmonic. Usually this effect
is called the beating frequency. The input voltage ripple (Channel 2) of two
nonsynchronized regulators running at frequencies about 15% apart is shown
in Figure A-1.
Figure A-1. Input Voltage Ripple and Main Switching Waveforms at V
= 5 V of Two
I
Regulators Switching at 15% Apart Frequencies
Out of Phase Synchronization of I/O and Core SWIFTE Family Regulators
A-1
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