TPS23755RJJR - IEEE 802.3at PoE PD with Flyback Controller | TI
料号： TPS23755RJJR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.65 | $1.65 |
| 10 | $1.48 | $14.80 |
| 100 | $1.32 | $132.00 |
| 500 | $1.2 | $600.00 |
| 1,000 | $1.1 | $1,100.00 |
TPS23755RJJR 概述
A PoE powered device interface is the front-end circuit that negotiates and extracts power from a Power Sourcing Equipment (PSE) port such as a PoE switch or injector, according to the IEEE 802.3at standard. Within the power-management hierarchy, it sits between the Ethernet cabling and the isolated flyback converter that generates the system's low-voltage rails, combining classification, inrush control, hot-swap protection, and switching regulation in one IC.
Key features include full 802.3at Type 1 (13 W) PD compliance, an integrated 150-V power MOSFET that eliminates the external pass switch, and current-mode flyback control with primary-side regulation (PSR). PSR removes the optocoupler and secondary-side reference, cutting component count and board area while improving reliability in isolated designs.
Technically, the device employs spread spectrum frequency dithering (SSFD) to reduce conducted EMI peaks, easing filter design toward CISPR compliance. Advanced startup circuitry supports operation from the PoE detection and classification voltage range before full power is available, and the current-mode architecture provides inherent cycle-by-cycle current limiting and simple loop compensation for the flyback power stage.
Typical applications include IP security cameras, wireless access points, VoIP phones, and networked LED lighting luminaires - all space-constrained PoE endpoints where a single-chip PD interface plus converter saves measurable board area. The high integration level makes it especially attractive for compact, cost-sensitive camera modules.
Design consideration: because the power FET is integrated, PCB copper area under the VSON exposed pad is the main thermal path; size the transformer and demagnetization timing so PSR sampling windows are honored, and verify EMI with SSFD enabled before final layout freeze.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： TPS23755RJJR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
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）
TPS23753ARJJR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS23755RJJR 最大额定值与电气特性
| 功能 | IEEE 802.3at PoE PD interface with no-opto flyback DC-DC controller |
| PoE Standard | IEEE 802.3at (Type 1, 13 W class) |
| 通道数 | 1 |
| Integrated Power FET | Yes, 150 V switching MOSFET |
| Regulation Topology | Current-mode flyback, primary-side regulation (PSR) |
| Optocoupler Requirement | None (no-opto design) |
| EMI Reduction | Spread spectrum frequency dithering (SSFD) |
| Startup Feature | Advanced startup |
| 封装 | 24-VSON (6x4 mm) |
| 安装类型 | Surface Mount |
| Output Power Class | Type 1 PoE (13 W) |
| Evaluation Module | TPS23755EVM-894 |
| Reel Variant | TPS23755RJJT |
TPS23755RJJR 24-vson (6x4 mm) 引脚配置指南
TPS23755RJJR（24-vson (6x4 mm) 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： TPS23755RJJR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPS23755RJJR 适用于 6 应用s: IP Security Cameras, Wireless Access Points, VoIP Desk Phones, PoE LED Lighting Luminaires, Networked Building Sensors and Controllers, Intercoms and Door Entry Systems.
IP Security Cameras
Networked surveillance cameras are the canonical 802.3at Type 1 PoE endpoint, drawing image-sensor, ISP, and network power from the Ethernet cable. The TPS23755RJJR fits this application because its integrated 150-V FET and no-opto PSR flyback controller produce an isolated 13 W supply from the PoE port in minimal board area, a decisive constraint inside compact dome or bullet camera housings. Spread spectrum frequency dithering lowers conducted EMI peaks near the sensitive video front-end and Ethernet PHY, simplifying filter design. Placed directly after the RJ45 diode bridge, the PD interface handles detection, classification, and inrush while the flyback stage generates the 3.3 V/5 V system rails, trading a slightly larger transformer for the elimination of the optocoupler and secondary reference.
推荐
Wireless Access Points
Ceiling-mounted Wi-Fi access points rely on PoE because running separate power cabling to ceilings is costly. A single-band or small dual-band AP typically falls within the 802.3at Type 1 13 W budget that the TPS23755RJJR serves. The device negotiates power with the PSE, controls inrush, and converts the 37-57 V PoE input into the 5 V or 3.3 V rails feeding the radio SoC and Ethernet magnetics. Its no-opto primary-side regulation removes a reliability-sensitive component from a unit that must run unattended for years at elevated ceiling temperatures, while the integrated 150-V FET avoids an extra high-voltage SMD part, shrinking the power section and cutting BOM cost per unit in volume access-point production.
推荐
VoIP Desk Phones
Enterprise VoIP phones classically power themselves from the desk Ethernet drop, making the PoE PD interface a mandatory front-end. The TPS23755RJJR provides the 802.3at detection and classification signature plus a compact isolated flyback converter, delivering speaker, handset, display, and phone-controller power within the 13 W Type 1 envelope. Primary-side regulation eliminates the optocoupler and its aging-related CTR drift, supporting the long service life and low warranty-return expectations of enterprise telephony. Spread spectrum dithering helps the design meet office conducted-emissions limits without bulky filtering near the audio path. Advanced startup ensures clean power-up sequencing from the PoE classification voltage before the main converter begins switching.
推荐
PoE LED Lighting Luminaires
Networked LED luminaires increasingly use PoE for both power and control in smart-building installations. The TPS23755RJJR serves Type 1 (13 W) fixtures such as downlights and accent lighting: its PD interface negotiates power from the PoE switch while the integrated 150-V FET and no-opto flyback controller convert the port voltage to a LED-friendly DC rail. Primary-side regulation removes the optocoupler, reducing component count inside thermally constrained luminaire housings, and spread spectrum frequency dithering suppresses EMI peaks that could couple into dimming control lines. The isolated flyback topology provides safety isolation between the Ethernet-powered input and the accessible LED string, an important consideration in commercial ceiling installations.
推荐
Networked Building Sensors and Controllers
Occupancy sensors, access-control readers, HVAC zone controllers, and other ceiling- or wall-mounted building devices benefit from PoE because a single Category cable delivers both connectivity and power. The TPS23755RJJR supplies the complete 802.3at Type 1 front end plus a compact isolated converter, generating clean 5 V or 3.3 V rails from the PoE port for the microcontroller and sensors. Its integrated 150-V power FET and no-opto PSR architecture keep the power section small enough for slim enclosures, while spread spectrum dithering minimizes conducted emissions near sensitive analog sensor front-ends. Advanced startup supports reliable reconnection after switch power cycling, and hot-swap inrush control protects both the device and the upstream PSE port electronics.
推荐
Intercoms and Door Entry Systems
PoE-powered door stations, video intercoms, and entry controllers draw speaker, camera, and lock-actuation power from the building Ethernet infrastructure. The TPS23755RJJR handles the 802.3at Type 1 PD negotiation and converts port power through an isolated no-opto flyback, delivering up to 13 W for the system rails. Primary-side regulation suits outdoor and vandal-resistant enclosures where long unattended service life is required, since the optocoupler - a common aging failure point - is eliminated. Spread spectrum frequency dithering reduces conducted EMI near the audio amplifier and camera circuitry, easing compliance testing. The integrated 150-V FET supports the full PoE input voltage range with margin, and the compact VSON-24 package fits flat door-station form factors.
推荐
推荐产品汇总
工程参考数据： TPS23755RJJR ——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 | TPS23753ARJJR |
|---|---|---|---|
| Package | 24-VSON (6x4 mm) | 24-VSON (6x4 mm) - same | 24-VSON (6x4 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3at Type 1 (13 W) | IEEE 802.3at Type 1 (13 W) | IEEE 802.3at Type 1 (13 W) |
| Integrated Power FET | Yes, 150 V | Yes, 150 V | Yes, 150 V |
| Feedback Method | Primary-side regulation (no-opto) | PSR plus opto/auxiliary topology support | Secondary-side (opto) flyback |
| Optocoupler Required | No | Optional (design dependent) | Yes |
关键差异点
- No-opto primary-side regulation (PSR) （对比 TPS23753ARJJR)
- Flexible topology support within the same footprint （对比 TPS23754RJJR)
- EMI performance via spread spectrum dithering （对比 TPS23753ARJJR)
设计说明
The TPS23755RJJR integrates a 150-V power FET, so the VSON-24 exposed pad is the primary thermal path for both the switching losses and conduction losses of the flyback stage. Provide a solid array of thermal vias from the exposed pad to inner and bottom copper layers, sized per the PCB layout guidelines in the manufacturer datasheet. Estimated: at a 13 W Type 1 load with roughly 85% converter efficiency, about 2.3 W is dissipated, so verify junction temperature against the datasheet thermal resistance with your actual PCB copper area before finalizing the layout.
Keep the primary-side hot loop (integrated FET, transformer primary, and sense resistor path) as small as possible to minimize radiated emissions, and place the PSR sensing network directly at the transformer auxiliary winding with short, low-inductance traces - PSR regulation accuracy depends on a clean demagnetization sampling window. Follow the TPS23755EVM-894 reference layout for transformer placement and ground partitioning between PoE input (hot) and controller grounds.
Enable spread spectrum frequency dithering (SSFD) during pre-compliance testing; it spreads the switching harmonics and typically lowers peak conducted emissions, allowing a smaller input filter. However, remember that dithering spreads energy across the band, so average-detector measurements near class limits also rise - validate with both peak and average detectors per your lab procedure. Choose the transformer for proper demagnetization timing so PSR output-voltage sampling occurs on the correct plateau.
Do not assume interoperability with the TPS23754/TPS23753A without checking the feedback architecture: the TPS23755 is a no-opto PSR design, so an existing opto-based flyback transformer winding arrangement may not be reusable without redesign. Also verify that your PoE classification resistor settings and inrush capacitor values match the 802.3at Type 1 power class required by your end equipment, as undersized classification signatures cause PSE power denial.
合规信息
Compliance status was not stated in the provided web data; confirm RoHS/REACH and lead-free status on the TI product page at ti.com/product/TPS23755 before ordering.
