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Overview
| Topology | Flyback Converter |
| Switching frequency | 227-278 kHz |
| IC revision | H |
Description
The TPS23754 and TPS23756 devices have a combined power-over-ethernet (PoE) powered-device (PD) interface and current-mode DC/DC controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard.
The TPS23754 and TPS23756 support a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference. These features allow the designer to determine which power source will carry the load under all conditions.
The PoE interface features the new extended hardware classification necessary for compatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.
The DC/DC controller features two complementary gate drivers with programmable dead time. This simplifies the design of active-clamp forward converters or optimized gate drive for highly-efficient flyback topologies. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current-sense filter design trade-offs.
The TPS23754 device has a 15-V converter startup while the TPS23756 device has a 9-V converter startup. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing.
Features
- Powers up to 30-W (Input) PDs
- DC/DC Control Optimized for
- Isolated Converters
- Supports High-Efficiency Topologies
- Complete PoE Interface
- Enhanced Classification per IEEE 802.3at With Status Flag
- Adapter ORing Support
- Programmable Frequency With Synchronization
- Robust 100-V, 0.5-Ω Hotswap MOSFET
- –40°C to 125°C Junction Temperature Range
- Industry Standard PowerPAD TSSOP-20
Typical applications
- Multiband Access Points
- IEEE 802.3at Compliant Devices
- Video and VoIP Telephones
- Security Cameras
- RFID Readers
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | Size | Version | ISAT,10%(A) | ISAT,30%(A) | Wire Type | IR(A) | Material | LR(µH) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD SMT Power Inductor, 3.3 µH, 4.75 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance3.3 µH | Performance Rated Current4.75 A | – | DC Resistance30 mΩ | Self Resonant Frequency55 MHz | Size7345 | VersionRobust | Saturation Current @ 10%4.5 A | Saturation Current @ 30%5.6 A | – | Rated Current3.3 A | – | – | ||||
 | WE-HCF SMT High Current Inductor, 47 µH, 12.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance47 µH | Performance Rated Current12.8 A | Saturation Current8.5 A | DC Resistance13.42 mΩ | Self Resonant Frequency10 MHz | Size2013 | VersionSMT | Saturation Current @ 10%7.5 A | Saturation Current @ 30%8.5 A | Wire TypeFlat | Rated Current12 A | MaterialMnZn | Rated Inductance12.45 µH | ||||
 | WE-PD2 HV SMT Power Inductor (High Voltage), 2200 µH, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 HV SMT Power Inductor (High Voltage) | Inductance2200 µH | – | Saturation Current0.2 A | DC Resistance7200 mΩ | Self Resonant Frequency1.6 MHz | Size7850 | – | – | – | – | Rated Current0.15 A | – | – | |||
750312794 | Flyback Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – |