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[FAQ] Some 25.5-W PoE PD Controllers & Their Key Features

Other Parts Discussed in Thread: TPS2378, TPS2379, TPS23751, TPS23752, TPS23754, TPS23756, TPS23731, TPS23734

TPS2378/9 (PD only):

-            Compliance to IEEE 802.3at

-              0.5-Ohm typ. hotswap

-              TPS2378 has adapter higher priority, TPS2379 has gate pin to drive an external hotswap


TPS23751/2 (PD + PWM controller):

-            Compliance to IEEE 802.3at

-              0.5-Ohm typ. hotswap

-              Flyback with secondary side regulation only (no internal error amplifier)

-              Sleep mode (disable DC/DC, TPS23752 only) and high efficiency light load mode (automatically reduce switching frequency at light load)

-              Support adapter priority

 TPS23754/6 (PD + PWM controller):

-            Compliance to IEEE 802.3at

-              0.5-Ohm typ. hotswap

-              TPS23754 has 15-V Vc UVLO; TPS23756 has 9-V Vc UVLO(used for low-voltage DC adapter case).

-              Both support flyback/ACF-active clamping forward (no internal error amplifier for both)

-              Support adapter priority & low voltage PD input

 TPS23731/4 (PD + PWM controller), newest:

-            Compliance to IEEE 802.3bt, at

-              0.3-Ohm typ. hotswap

-              TPS23731 supports flyback; TPS23734 supports flyback/ACF (both have internal error amplifier, can be configured to low side SW Buck converter)

-              Support primary side regulation (no need for OPTO feedback)

-              Support auto maintain power signature

-              Programmable frequency dithering for EMI

-              Support soft-stop

-              Support adapter priority