Overview
The TPS2375PWR-1 is a Power over Ethernet (PoE) Powered Device (PD) controller from Texas Instruments. This device is designed to comply with the IEEE 802.3af standard and is part of the TPS2375 family. It integrates all the necessary features for developing an IEEE 802.3af-compliant powered device, including detection, classification, and undervoltage lockout (UVLO). The TPS2375PWR-1 is particularly useful in applications requiring reliable and efficient power delivery over Ethernet cables.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Voltage Range (VDD) | -0.3 | - | 100 | V |
| UVLO Turnon Voltage | 38.4 | 39.3 | 40.4 | V |
| UVLO Turnoff Voltage | 29.6 | 30.5 | 31.5 | V |
| UVLO Hysteresis | 8.3 | 8.8 | 9.1 | V |
| Operational Current Limit | 405 | - | - | mA |
| Inrush Current Limit | - | - | 400 | mA |
| Package Type | - | - | TSSOP-8 | - |
| Operating Temperature Range | -40 | - | 85 | °C |
| ESD Protection | - | - | 15 kV | - |
Key Features
- Fully supports IEEE 802.3af specification with auto-retry after current-limit fault.
- Integrated 0.58-Ω, 100-V, low-side switch.
- Programmable inrush current control to prevent line voltage sag.
- Fixed 450-mA current limit and operational current limit protection.
- Open-drain, power-good reporting with deglitch delay.
- Industrial temperature range: -40°C to 85°C.
- 8-pin TSSOP package.
- 15-kV system level ESD capable.
Applications
- VoIP Phones
- WLAN Access Points
- Security Cameras
- Internet Appliances
- POS Terminals
Q & A
- What is the primary function of the TPS2375PWR-1?
The TPS2375PWR-1 is a Power over Ethernet (PoE) Powered Device (PD) controller designed to comply with the IEEE 802.3af standard.
- What is the voltage range for the VDD input?
The voltage range for the VDD input is from -0.3 V to 100 V.
- What is the purpose of the UVLO function?
The undervoltage lockout (UVLO) function monitors the line voltage to determine when to apply power to the downstream load and allow the PD to power up.
- How does the inrush current limiting work?
The inrush current limiting is controlled by a resistor connected to the ILIM pin, which sets the inrush current limit to prevent the line voltage from sagging below the lower UVLO threshold.
- What is the operational current limit of the TPS2375PWR-1?
The operational current limit is 405 mA.
- What type of package does the TPS2375PWR-1 come in?
The TPS2375PWR-1 comes in an 8-pin TSSOP package.
- What is the operating temperature range for the TPS2375PWR-1?
The operating temperature range is from -40°C to 85°C.
- Does the TPS2375PWR-1 have ESD protection?
Yes, the TPS2375PWR-1 is 15-kV system level ESD capable.
- What are some common applications for the TPS2375PWR-1?
Common applications include VoIP phones, WLAN access points, security cameras, internet appliances, and POS terminals.
- How does the power-good (PG) output function?
The PG output is an open-drain output that goes to a high resistance state when the internal MOSFET is enabled and the device is not in inrush current limiting. It requires a pullup resistor or other interface.
