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Overview
| Topology | Flyback Converter |
| Input voltage | 0-57 V |
| Switching frequency | 223-273 kHz |
| Output 1 | 5 V / 2 A |
| IC revision | C |
Description
The TPS23753 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converter designs. The PoE implementation supports the IEEE 802.3at standard as a 13 W, type 1 PD. The requirements for an IEEE 802.3at type 1 device are a superset of IEEE 802.3-2008 (originally 802.3af) requirements.
The TPS23753 supports a number of input-voltage ORing options including highest voltage, external adapter preference, and PoE preference.
The PoE interface features an external detection signature pin that can also be used to disable the internal hotswap MOSFET. This allows the PoE function to be turned off. Classification can be programmed to any of the defined types with a single resistor.
The dc/dc controller features a bootstrap startup mechanism with an internal, switched current source. This provides the advantages of cycling overload fault protection without the constant power loss of a pull up resistor.
The programmable oscillator may be synchronized to a higher-frequency external timing reference.
Features
- Optimized for Isolated Converters
- Complete PoE Interface
- Adapter ORing Support
- 12 V Adapter Support
- Programmable Frequency with Synch.
- Robust 100 V, 0.7 Hotswap MOSFET
- Small TSSOP 14 Package
- 15 kV / 8 kV System Level ESD Capable
- –40°C to 125°C Junction
- Temperature Range
- Design Procedure Application Note - SLVA305
- Adapter ORing Application Note - SLVA306
Typical applications
- Access Points
- Security Cameras
- VoIP Telephones
- IEEE 802.3at Compliant Powered Devices
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Version | VIN | VOut1(V) | IOut1(A) | VOut2(V) | L(µH) | n | VT(V (AC)) | Size | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-LHMI SMT Power Inductor, 1.95 A, 1.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Performance Rated Current1.95 A | Saturation Current @ 10%1.5 A | Saturation Current @ 30%3.15 A | DC Resistance243 mΩ | Self Resonant Frequency23 MHz | – | – | – | – | – | Inductance10 µH | – | – | Size4020 | MountSMT | ||||
 | WE-PoE Power over Ethernet Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE Power over Ethernet Transformer | – | – | – | – | – | VersionFlyback | Input Voltage 36 - 57 V (DC) | Output Voltage 15 V | Output Current 12 A | Output Voltage 25 V | Inductance180 µH | Turns Ratio6:1:1:2.17 | Insulation Test Voltage1500 V (AC) | SizeEP13 | MountSMT |