Hi, My name is SANG-RAE LEE worked for IT-Telecom in Korea.
Main items of my company are V2X products including wireless network.
So we use power amplifier for WI-FI and TPS7A8101 is linear regulator to supply 5-volt power to power amplifier because it is low-noise, wide-bandwidth, high PSRR and low-dropout linear regulator.
The input power source of TPS7A8101 is step-down regulator.
The output voltage level of step-down regulator is 5 volts and the same with output voltage level of TPS7A8101.
We have some questions in this conditions.
1) If the input voltage level of TPS7A8101 is equal to output voltage level, then what are the predictable problems?
5V INPUT => [TPS7A8101] => 5V OUTPUT
2) If the power amplifier current consumption of WI-FI is 1A, then what is the predictable output voltage level of TPS7A8101 including voltage drop or dropout voltage level?
5V INPUT => [TPS7A8101] => 5V OUTPUT=> [1A POWER AMPLIFIER]
3) In another case, if we use 5.5 volts as input power voltage, then what is the predictable output voltage level of TPS7A8101 including voltage drop or dropout voltage level?
5.5V INPUT => [TPS7A8101] => 5V OUTPUT=> [1A POWER AMPLIFIER]
4) What is the difference between case 2) and case 3)?
5) Can you explain internal operation of TPS7A8101 in case of 2) and 3) above?
Thank you.
Good Bye.
Best Regards.
SANG-RAE LEE