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Texas Instruments TPS23753A
IEEE 802.3 PoE INTERFACE AND CONVERTER CONTROLLER WITH ENHANCED ESD IMMUNITY
Overview
| Topology | Flyback Converter |
| Input voltage | 12-24 V |
| Switching frequency | 223-273 kHz |
| Output 1 | 5 V / 2 A |
| IC revision | B |
Description
The TPS23753A 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 IEEE 802.3af).
The TPS23753A 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. The TPS23753A features improvements for uninterrupted device operation through an ESD event.
Features
- Enhanced ESD Ride-Through Capability
- 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
Remarks:1)From Application notes (8)Using the TPS23753A with an External Error Amplifier
- Transformer T1 is used at the output, due to this inductor value L1=4.7uH is not taken
2)From User guides (3)TPS23753AEVM-235 Evaluation Module (Rev. A)
- Transformer T1 is used at the output, due to this inductor value L1=10uH is not taken
Typical applications
- VoIP Telephones
- Access Points
- IEEE 802.3at Compliant Powered Devices
- Security Cameras
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT(A) | fres(MHz) | Mount | IRP,40K(A) | RDC max.(mΩ) | Size | Version | Winding Style | Number of windings | L1(µH) | Zmax(Ω) | IR(mA) | RDC max.(Ω) | VR(V) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD SMT Power Inductor, 1 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance1 µH | – | Saturation Current4.5 A | Self Resonant Frequency192 MHz | MountSMT | Performance Rated Current3.75 A | DC Resistance39 mΩ | Size6033 | VersionRobust | – | Number of windings6.5 | – | – | – | – | – | ||||
 | WE-TPC SMT Tiny Power Inductor, 3.9 µH, 1.72 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.9 µH | Rated Current1.72 A | Saturation Current1.65 A | Self Resonant Frequency55 MHz | MountSMT | – | DC Resistance60 mΩ | Size4828 | – | – | Number of windings10.5 | – | – | – | – | – | ||||
 | WE-SL5 SMT Common Mode Line Filter, 250 µH, 2.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SL5 SMT Common Mode Line Filter | Inductance250 µH | Rated Current2.8 A | – | – | MountSMT | – | DC Resistance35 mΩ | – | VersionSMT | Winding Stylesectional | Number of windings2 | Inductance [1]250 µH | Maximum Impedance1200 Ω | Rated Current2000 mA | DC Resistance [1]0.035 Ω | Rated Voltage80 V | ||||
750311832 | Flyback Transformer WE-FB, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer WE-FB | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |