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Introduction
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1 Introduction
The TPS2378EVM allows reference circuit evaluation of the TI TPS2378 PD controller. The TPS2378
features an auxiliary power detect (APD) input, providing priority for an external power adapter. It also
features a 100 V pass transistor, 140 mA inrush current limiting, type-2 indication, auto-retry fault
protection, and an open-drain power-good output.
1.1 Features
• Gigabit Ethernet pass through interface
• Switched output return for “ease of use” loading
• Adapter input capability
• IEEE 802.3at type-2 hardware classification with status flag (T2P) and LED
• DC/DC converter enable (CDB)
• Robust 100 V, 0.5 Ω hotswap MOSFET
• Operating current up to 1A typical
1.2 Applications
• IEEE 802.3at-compliant devices
• Video and VoIP telephones
• Multiband access points
• Security cameras
• Pico-base stations
2 Electrical Specifications at 25°C
Table 1. TPS2378EVM Electrical and Performance Specifications
PARAMETER CONDITION MIN TYP MAX UNITS
POWER INTERFACE
Input Voltage Applied to the power pins of connectors J1 or J3 0 – 57 V
Operating Voltage After start up. 30 – 57 V
Rising input voltage at device terminals. – – 40
Input UVLO V
Falling input voltage. 30.5 – –
Detection voltage At device terminals 1.4 – 10.1 V
Classification voltage At device terminals 11.9 – 23.0 V
Classification current Rclass = 63.4 Ω 38 – 42 mA
Inrush current-limit 100 – 180 mA
Operating current-limit 850 – 1200 mA
Two input pairs:
Efficiency 97.4%
Measured from J1 to J6 with J5 shorted. 31W output power
2 TPS2378 EVM User’s Guide SLVU682 – March 2012
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