Overview
The TPS23753A, produced by Texas Instruments, is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC-DC controller. It is optimized specifically for isolated converter designs and supports the IEEE 802.3at standard as a 13-W, type 1 PD. This device integrates a complete PoE interface with an isolated DC-DC converter controller, making it suitable for various applications requiring power delivery over Ethernet.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Input voltage | Applied to the power pins of connectors J2 or J4 | 0 | 57 | V | |
| Operating voltage | After start-up | 30 | 57 | V | |
| Rising input voltage | 36 | V | |||
| Input UVLO | 30 | V | |||
| Detection voltage | At device terminals | 3 | 10 | mA | |
| Classification voltage | At device terminals | 10 | 23 | mA | |
| Classification current | Rclass = 1270 Ω | 1.8 | 2.4 | mA | |
| Inrush current-limit | 90 | 190 | mA | ||
| Operating current-limit | 405 | 495 | mA | ||
| Output voltage (3.3-V) | 20 V ≤ Vin ≤ 57 V, ILOAD ≤ ILOAD (max) | 3.13 | 3.3 | 3.47 | V |
| Output voltage (5-V) | 10.8 V ≤ Vin ≤ 13.2 V, ILOAD ≤ ILOAD (max) | 4.75 | 5 | 5.25 | V |
| Output current (3.3-V) | 20 V ≤ Vin ≤ 57 V | 1.4 | A | ||
| Output current (5-V) | 10.8 V ≤ Vin ≤ 13.2 V | 0.8 | A | ||
| Output ripple voltage (3.3-V) | Vin = 44 V, ILOAD = 2 A | 65 | mV | ||
| Output ripple voltage (5-V) | Vin = 44 V, ILOAD = 1.4 A | 50 | mV | ||
| Efficiency (3.3-V) | Vin = 44 V, ILOAD = 2 A | 77 | % | ||
| Efficiency (5-V) | Vin = 44 V, ILOAD = 1.4 A | 80 | % | ||
| Switching frequency | 225 | 270 | kHz |
Key Features
- Enhanced ESD Ride-Through Capability: The TPS23753A features improvements for uninterrupted device operation through an ESD event, with 15-kV and 8-kV system level ESD capability.
- Optimized for Isolated Converters: Designed specifically for isolated converter topologies, supporting IEEE 802.3at standard as a 13-W, type 1 PD.
- Complete PoE Interface: Includes an external detection signature pin and supports classification programming with a single resistor.
- Adapter ORing Support: Supports various input-voltage ORing options including highest voltage, external adapter preference, and PoE preference.
- 12-V Adapter Support: Compatible with 12-V adapters in addition to PoE and other voltage sources.
- Programmable Frequency with Synchronization: Allows synchronization to a higher-frequency external timing reference.
- Robust 100-V, 0.7-Ω Hotswap MOSFET: Provides reliable hotswap functionality.
- Small 14-Pin TSSOP Package: Compact design suitable for space-constrained applications).
- Bootstrap Start-Up Mechanism: Features an internal, switched current source for cycling overload fault protection without constant power loss).
Applications
- Voice over Internet Protocol (VoIP) – IP Telephones: Suitable for powering IP phones with efficient and reliable power delivery).
- Wireless LAN – Wireless Access Points: Ideal for wireless access points requiring stable and efficient power supply).
- Security – Wired IP Cameras: Used in wired IP cameras to ensure continuous and reliable power supply).
- Industrial Gateways: Can be used in industrial gateways for robust and efficient power management).
Q & A
- What is the TPS23753A used for?
The TPS23753A is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC-DC controller optimized for isolated converter designs).
- Which PoE standard does the TPS23753A support?
The TPS23753A supports the IEEE 802.3at standard as a 13-W, type 1 PD).
- What are the key features of the TPS23753A's PoE interface?
The PoE interface includes an external detection signature pin, supports classification programming, and has adapter ORing options).
- What is the operating temperature range of the TPS23753A?
The junction temperature range is –40°C to 125°C).
- What type of package does the TPS23753A come in?
The TPS23753A comes in a small 14-Pin TSSOP package).
- Does the TPS23753A support hotswap functionality?
Yes, it features a robust 100-V, 0.7-Ω hotswap MOSFET).
- How can the oscillator frequency be controlled in the TPS23753A?
The programmable oscillator can be synchronized to a higher-frequency external timing reference).
- What kind of ESD protection does the TPS23753A offer?
The TPS23753A is capable of withstanding 15-kV and 8-kV system level ESD events).
- What are some common applications of the TPS23753A?
Common applications include VoIP – IP telephones, wireless LAN – wireless access points, and security – wired IP cameras).
- How does the TPS23753A handle inrush current?
The device has an inrush current-limit feature to manage startup currents effectively).
