Texas Instruments TPS2375EVM, User Manual, Page: 15 / 26

Features
3-3 EVM Operation
3.4 Features
The HPA028 EVM facilitates easy evaluation of the TPS2375 PD controller.
The EVM features are described in this section.
3.4.1 Input and Output Capacitors
The input capacitor of the TPS2375 PD controller is specified by the
IEEE802.3af standard. C1, a 0.1
µ
F
±
10% ceramic capacitor, meets the IEEE
specification, so no additional input capacitor can be added.
Two spare capacitor footprints (C2 and C4) on the EVM are provided for
adding additional load capacitance on the output of the TPS2375. When
adding any of the large aluminum electrolytic capacitors, care should be taken
to select capacitors with an appropriate voltage rating, and to observe the
polarity marking on the PCB silkscreen. The recommended voltage rating for
these capacitors is 100 V.
3.4.2 Gigabit Ethernet Application
The EVM only allows 10/100BASE data rate transmission due to the magnetic
limitation of T1 (H2019). To evaluate the EVM with a Gigabit Ethernet network,
remove T1 (H2019), R13, R14, R15, and R16, and place a Gigabit transformer
(H5007) on the T2 footprint.
3.4.3 Dual DUT Footprint
Since the TPS2375 is available in both SO-8 and TSSOP-8 packages, two
footprints (U1 and U2) are provided to test either package. The EVM is
supplied with the SO-8 package device (TPS2375D) on the U2 footprint. To
evaluate the TSSOP package, remove the device from U2 and solder a
TSSOP-8 package device (TPS2375PW) on the U1 footprint.
Warning
Do not have devices on both U1 and U2 at the same time.
3.4.4 Power-Good Indicator
The PG LED (D3) Indicator illuminates when the TPS2375 turns on.
3.4.5 Connect DC/DC Converter
A block connector (J2) is provided to connect downstream DC/DC converters
if desired. Test points (such as TP17 and TPS20) are not recommended for
connecting loads.