TPS23758RJJT - 802.3at PoE PD with Flyback Controller | TI
料号： TPS23758RJJT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.19 | $2.19 |
| 10 | $2.05 | $20.50 |
| 100 | $1.89 | $189.00 |
| 500 | $1.75 | $875.00 |
| 1,000 | $1.62 | $1,620.00 |
TPS23758RJJT 概述
A PoE PD interface and controller is a power management IC that performs the powered-device detection, classification, and inrush-current limiting required by IEEE 802.3at, then provides the front-end power conversion for extracting DC power from Ethernet cabling. In the system hierarchy it sits at the entry point of the power path: Ethernet cable -> PD interface -> flyback converter -> isolated DC rails.
Key features include the integrated 150-V power MOSFET, which eliminates an external switch and shrinks BOM count, and primary-side regulation (PSR), which removes the optocoupler and secondary-side feedback circuits from the isolated converter. Advanced startup supports operation directly from the Ethernet input voltage, and spread spectrum frequency dithering (SSFD) eases EMI compliance.
Technically, the TPS23758 is a Type 1 (13 W class) 802.3at PD solution. The current-mode flyback architecture with PSR delivers tightly regulated isolated outputs without a secondary feedback path, while the integrated high-voltage FET withstands PoE input transients. According to the TI product page, the high level of integration makes the TPS23758 an ideal solution for size-constrained applications such as IP cameras, wireless access points, and VoIP phones.
Typical applications include IEEE 802.3at Type 1 PoE powered devices, IP network cameras, 802.11 access points, and IP telephones where board area and isolation compliance drive the design.
A key design consideration is the converter transformer: PSR flyback designs require careful transformer selection (leakage inductance and turns ratio) to maintain output regulation accuracy; TI's TPS23758EVM-080 evaluation module provides a proven reference design.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： TPS23758RJJT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TPS23758RJJT （相同外形与封装尺寸） ——差异在于 Evaluation Module, Function, Output Power Class, Package.
快速对比工具——选择替代料号进行并排对比：
TPS23754RJJR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS23755RJJR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.1 / 个
查看数据手册 →TPS23757RJJR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS23758RJJT 最大额定值与电气特性
| 功能 | IEEE 802.3at PoE PD interface with no-opto sync flyback DC-DC controller |
| PoE Standard | IEEE 802.3at (Type 1, 13 W class) |
| 通道数 | 1 |
| Integrated Power FET Voltage Rating | 150 V |
| 拓扑 | Current-mode flyback, synchronous, no-opto |
| Regulation Scheme | Primary Side Regulation (PSR) |
| EMI Technique | Spread Spectrum Frequency Dithering (SSFD) |
| Startup | Advanced startup from PoE input |
| 封装 | 24-VSON (6x4 mm) exposed pad (24-VFDFN, 23 leads) |
| 安装类型 | Surface Mount |
| Output Power Class | 13 W (Type 1 PoE PD) |
| Evaluation Module | TPS23758EVM-080 |
TPS23758RJJT 24-vson (6x4 mm) exposed pad (24-vfdfn, 23 leads) 引脚配置指南
TPS23758RJJT（24-vson (6x4 mm) exposed pad (24-vfdfn, 23 leads) 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： TPS23758RJJT.
请参阅 数据手册 以查看完整引脚配置。
安全工作区 (150-V integrated power FET)
典型应用
TPS23758RJJT 适用于 6 应用s: IP Network Cameras, IEEE 802.11 Wireless Access Points, VoIP and IP Telephones, Size-Constrained PoE Powered Devices, Industrial PoE Sensor Nodes, PoE-Enabled Security and Access-Control Devices.
IP Network Cameras
IP cameras are the flagship application for integrated PoE PD front ends because camera housings impose severe height and area limits. The TPS23758RJJT fits by combining the 802.3at PD interface, a 150-V internal FET, and the flyback controller in one 24-VSON (6x4 mm) exposed-pad package, eliminating a discrete high-voltage MOSFET and the optocoupler from the isolated supply. Primary-side regulation delivers an isolated 5 V or 3.3 V rail for the image sensor and ISP without secondary feedback components, while spread spectrum frequency dithering (SSFD) reduces switching harmonics that could couple into analog video paths. The 13 W Type 1 power class covers typical fixed and PTZ-lite camera loads. Designers should follow the TPS23758EVM-080 transformer recommendations to hold PSR output regulation within camera tolerance limits.
推荐
IEEE 802.11 Wireless Access Points
Wireless access points powered over Ethernet benefit directly from the TPS23758RJJT's integration level: one 24-VSON package provides PD classification, inrush limiting, the 150-V switching FET, and a current-mode no-opto flyback converter, freeing PCB area for RF front ends and reduced board layers. The advanced startup circuit supports startup directly from the PoE input voltage, simplifying brown-out behavior on long cable runs where the input voltage sags. PSR removes the optocoupler, improving reliability in ceiling-mounted equipment where service access is costly. SSFD eases conducted EMI compliance alongside the radio. Note that designs drawing above the 13 W Type 1 budget (e.g., multi-radio 802.11ax APs) require a higher-class PD device instead; the TPS23758 targets single-radio or lite configurations.
推荐
VoIP and IP Telephones
IP phones are classic 802.3at Type 1 (13 W) powered devices, and the TPS23758RJJT maps cleanly onto their power architecture: the integrated PD interface handles detection, classification, and 802.3at inrush compliance, while the internal 150-V FET and PSR flyback controller generate the isolated 5 V handset/DSLIC rail and downstream LDO inputs in a compact 24-VSON (6x4 mm) footprint. Eliminating the optocoupler via primary-side regulation reduces component count in cost-sensitive phone BOMs and removes an aging-sensitive part. The no-opto architecture also improves transient response consistency across production. Layout should keep the primary switching loop tight to limit radiated emissions near the handset audio path, per the TI datasheet layout section.
推荐
Size-Constrained PoE Powered Devices
Per the TI product description, the high integration level along with PSR, SSFD, and advanced startup makes the TPS23758 an ideal solution for size-constrained applications in general: security sensors, building-automation endpoints, thin access-control readers, and ceiling or wall-plate electronics where every cubic millimeter counts. The single 24-VSON (6x4 mm) package replaces a PD controller, an external high-voltage MOSFET, an optocoupler, and secondary feedback circuitry, cutting both board area and assembly cost. The 150-V FET rating provides margin against PoE input transients, and spread spectrum dithering reduces the size of EMI filtering needed. Engineers porting an EVM-080-based design should re-verify transformer parameters against their exact output voltage and current requirements to preserve PSR regulation accuracy.
推荐
Industrial PoE Sensor Nodes
Industrial Ethernet sensor and IoT nodes increasingly draw power from the same cable that carries data, and the TPS23758RJJT provides a robust front end for these Type 1 (13 W) nodes. The integrated 150-V power FET withstands the voltage transients common in factory cabling, while advanced startup ensures reliable power-up from the PoE input under worst-case cable conditions. Primary-side regulation keeps the isolated output free of optocoupler drift over the industrial temperature span, an advantage for long-life sensor installations. SSFD reduces conducted emissions, easing system-level EMI qualification in electrically noisy plants. The compact 24-VSON (6x4 mm) exposed-pad package provides a low thermal-resistance path to the PCB copper, supporting dissipative loads without a heatsink in most node designs.
推荐
PoE-Enabled Security and Access-Control Devices
Access-control panels, door controllers, and security sensors powered via PoE require an isolated, compliant power front end in a small footprint - exactly the TPS23758RJJT's design center. The device performs the IEEE 802.3at detection and classification handshake required by managed PoE switches, then its integrated 150-V FET and PSR flyback controller deliver an isolated logic rail without an optocoupler, improving mean time between failures for security infrastructure that must stay online. The no-opto scheme also removes a component sensitive to dust and temperature, valuable in uncontrolled environments. Type 1 (13 W) power capability covers most reader and controller loads; lock-solenoid bursts should be buffered with local bulk capacitance downstream of the flyback output, sized per the datasheet's output capacitance guidance.
推荐
推荐产品汇总
工程参考数据： TPS23758RJJT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TPS23754RJJR | TPS23755RJJR | TPS23757RJJR |
|---|---|---|---|---|
| Package | 24-VSON (6x4 mm) exposed pad | 24-VSON (6x4 mm) - same | 24-VSON (6x4 mm) - same | 24-VSON (6x4 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3at (Type 1, 13 W) | IEEE 802.3at family | IEEE 802.3at family | IEEE 802.3af (12.95 W class) |
| Regulation Scheme | Primary Side Regulation (no-opto) | PSR flyback family | PSR flyback family | PSR flyback family |
关键差异点
- Fully integrated PoE PD front end （对比 TPS23757RJJR)
- Optocoupler eliminated by PSR （对比 TPS23754RJJR)
- 150-V integrated power FET （对比 discrete PD + external FET solutions)
设计说明
Place the primary switching loop (transformer primary, integrated 150-V FET drain/source, and current-sense path) with minimal area on the top layer, using the exposed pad of the 24-VSON (6x4 mm) package as the primary thermal and grounding path. Connect the exposed pad to a solid ground pour with an array of thermal vias. Keep the PoE classification and detection pins away from the high dv/dt drain node to avoid misclassification. Follow the TI datasheet layout section and the TPS23758EVM-080 board layout as proven starting points.
The TPS23758 is a Type 1 (13 W) PoE PD solution. Estimated: at 13 W output and an assumed 85% flyback efficiency, input power is roughly 15.3 W, so verify the upstream PSE budget and cabling accordingly. Because regulation uses primary-side sensing, transformer selection (turns ratio, leakage inductance, magnetizing inductance tolerance) directly determines output accuracy - specify a transformer matched to the EVM-080 recommendation or have the vendor qualify it for PSR operation. Do not attempt output currents beyond the Type 1 class without redesigning around a higher-class PD device.
Spread spectrum frequency dithering (SSFD) lowers conducted-emission peaks, but PoE ports still need common-mode filtering and isolation to meet system requirements. Include a snubber across the transformer primary to damp leakage-inductance ringing at the drain node, and keep the Ethernet magnetics' isolation barrier clean from switching-node contamination. Estimated: dithering typically spreads each harmonic over several percent of bandwidth, reducing peak emissions by several dB - measure conducted emissions early in development rather than after layout freeze.
Do not treat family members as blind swaps: TPS23754/TPS23755/TPS23757 share the 24-VSON package but differ in power class and configuration details. Verify pinout and classification behavior against each datasheet before substitution. Also note that secondary-side output accuracy in PSR designs depends on transformer parasitics - a low-cost transformer substitution can shift the regulated output by hundreds of millivolts. Finally, the RJJT and RJJR suffixes denote different packing quantities, not electrical differences; order accordingly.
合规信息
Compliance data was not present in the provided web data. TI product pages typically report RoHS/green status per package - verify on ti.com before procurement.
