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Q: TPS63000 Buck/Boost Transition by 1294176
Can you please comment on the buck to boost transition point in terms of input voltage vs. output voltage for the TPS63000? In particular, does this behavior depend upon the load current?
A: Re: TPS63000 Buck/Boost Transition by 10449
The transition between buck and boost modes is a function the load current. Larger currents will have larger voltage drops through pwb traces, FET Rdson, and inductor DCR, so the TPS63000 will start transitioning from buck mode to boost mode at higher input voltages when load current is higher. Note that transition is seamless so you do not have to worry about actual transition points. Also note that as the input voltage is dropping and the TPS63000 starts the transition from buck to boost mode, the TPS63000 will switch back and forth between both modes. This is normal and expected. The internal control loop is doing what is required to keep the output voltage within regulation.
This is similar in all TPS630xx parts.
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