Other Parts Discussed in Thread: , PMP20220, PMP11254, TPS23731, TLV431, TPS23754
Hello,
We are designing a power supply for a device with required output voltage 5V. The device will always be plugged in to a PoE connection but will be in an idle state at most times drawing a current of around 500mA to 800mA. In operational mode, the current goes up to 2.7A. We have selected the TPS23751 as the device for our design.
Based on our understanding of the datasheet recommendations, we planned to use the Synchronous Rectifier Disable (SRD) function to switch between PWM and VFO mode since our load current will be light at most times. We ordered the TPS23751EVM-104 and planned to design our power supply based on that. However, I looked at the PMP20220 which is designed for a 3A load current, which is closer to our requirement. PMP20220 does not seem to use the SRD function and operates only in PWM mode. But looking at the test results of both, the PMP20220 seems to have as good or better efficiency than the TPS23751EVM-104 at our required load currents.
So I have 2 questions regarding what would be best for us:
1. Would you recommend the TPS23751EVM-104 design or the PMP20220 design for our device?
2. Since our load current will be light at most time and only increasing during the brief periods of device use, would it be advisable for us to use diode rectification instead of synchronous rectification? If yes, are there any reference designs for the TPS23751 using diode rectification?
Thanks.
Akshay.