Texas Instruments TPS2379 EVM, Руководство пользователя

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Introduction
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1 Introduction
The TPS2379EVM allows reference circuit evaluation of the TI TPS2379 PD controller. The TPS2379
features GATE output for controlling external MOSFETs for extended power applications. 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
• GATE output to drive the external MOSFET
• Extra detection and class signature selection for non-standard applications
• IEEE 802.3at type-2 hardware classification with status flag (T2P) and LED
• DC/DC converter enable (CDB)
• Robust 100 V, 0.5 Ω internal hotswap MOSFET and 100 V, 64 m Ω external MOSFET
• Operating power in excess of 60W with four-pair PSE
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. TPS2379EVM 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
J6 shunt removed 24.9
Detection signature k
Ω
J6 shunt installed 12.5
J7 shunt removed 38 – 42
Classification current mA
J7 shunt installed 64 – 72
Inrush current-limit 100 – 180 mA
Internal MOSFET only (R13 removed) 850 – 1200
Operating current-limit mA
Internal plus external (R13 installed) 2260
Efficiency Four input pairs. Measured from J1 to J4 60W output power 97.5%
2 TPS2379 EVM User’s Guide SLVU687 – March 2012
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