TPS23758RJJR - IEEE 802.3at PoE PD Flyback Controller | TI
MPN: TPS23758RJJR ✓ Hoạt độngTPS23758RJJR Tóm tắt
A PoE PD interface is the circuit that negotiates and extracts power from Ethernet cabling per IEEE 802.3at, sitting within the hierarchy of power management ICs (PoE controller -> power interface -> power management IC -> semiconductor). It performs detection, classification, inrush control, and load switching for devices powered over the data cable, such as IP cameras and wireless access points.
Key differentiating features include high integration: the TPS23758 combines the PD interface, a 150-V switching power FET, and the DC-DC controller in one die set, reducing external component count. Primary-side regulation (PSR) eliminates the optocoupler and secondary-side feedback network, while spread spectrum frequency dithering (SSFD) reduces EMI peak emissions. Advanced startup supports efficient boot sequencing from the PoE input.
Technically, the device operates as a current-mode flyback controller optimized for isolated or non-isolated PoE conversion topologies. The no-opto sync architecture uses transformer auxiliary-winding sensing for output regulation, improving reliability and shrinking the solution footprint compared with conventional optocoupler flybacks. The integrated 150-V FET withstands PoE input transients common on long cable runs.
Typical applications include IEEE 802.3at Type 1 (13 W) IP network cameras, wireless access points, VoIP phones, and other size-constrained PoE-powered endpoints where board space and EMI compliance are critical constraints.
A key design consideration is transformer selection: the no-opto PSR scheme depends on accurate auxiliary-winding design, and TI recommends following the TPS23758EVM-080 reference design transformer specification for Type 1 applications.
This page synthesizes distributor inventory data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho TPS23758RJJR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
TPS23754
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TPS23755
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TPS23758RJJR Tỷ lệ tối đa & tính chất điện
| Chức năng | IEEE 802.3at PoE PD interface with no-opto sync flyback DC-DC controller |
| PoE Standard | IEEE 802.3at (PoE+) |
| PoE Class Support | Type 1 (13 W) |
| Integrated Switching FET | Yes, 150 V power FET |
| Control Topology | Current-mode flyback, no-opto synchronous |
| Regulation Method | Primary-side regulation (PSR) |
| EMI Feature | Spread spectrum frequency dithering (SSFD) |
| Startup Feature | Advanced startup |
| Kênh | 1 |
| Hộp | 24-VSON (6 mm x 4 mm) |
| Kiểu lắp đặt | Surface Mount |
Hướng dẫn cấu hình chân TPS23758RJJR 24-vson (6 mm x 4 mm)
Cấu hình chân cho TPS23758RJJR (24-vson (6 mm x 4 mm) gói). Động cơ điện này có chân cổng, nguồn và đầu ra. Đối với các gói không phân極, tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết hướng dẫn chính xác của chân 1 và chi tiết về vân footprint. Các ứng dụng phổ biến bao gồm thiết kế nguồn cung cấp điện, điều khiển động cơ và chuyển đổi tải.
Không có dữ liệu chân cụ thể sẵn có cho TPS23758RJJR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
TPS23758RJJR phù hợp cho 6 Áp dụngs: IP Network Cameras, Wireless Access Points, VoIP Phones, PoE Lighting and LED Drivers, Building Automation and Security Sensors, Industrial Network Edge Devices.
IP Network Cameras
The TPS23758RJJR fits IEEE 802.3at Type 1 IP camera designs because it delivers up to 13 W from the PoE link while integrating the PD interface, 150-V power FET, and no-opto flyback controller in a 6 mm x 4 mm 24-VSON package, a footprint small enough to sit behind the RJ45 magnetics in compact dome and bullet camera housings. In the circuit, the PD section performs detection, classification, and inrush limiting directly from the Ethernet pair, and the current-mode flyback stage with primary-side regulation generates the camera's 5 V or 3.3 V rail without an optocoupler, freeing secondary-side area for the image sensor and ISP power tree. Spread spectrum frequency dithering reduces peak conducted EMI, easing EMC compliance in a metal-free plastic enclosure.
Được đề xuất
Wireless Access Points
Wireless access points commonly draw within 802.3at Type 1 budgets, and the TPS23758RJJR suits them because its integrated 150-V FET withstands PoE link transients on long cable runs while PSR eliminates optocoupler feedback, improving MTBF in ceiling-mounted units that are costly to service. The device extracts and negotiates power on the PD side, then its no-opto synchronous flyback converts the 37 V to 57 V PoE input to the access point's system rail with good cross-load regulation from the auxiliary-winding sensing scheme. SSFD dithering lowers EMI peaks near the 2.4 GHz and 5 GHz radios' sensitive bands, reducing filtering effort on the RF power supply. Designers should follow the TPS23758EVM-080 transformer specification for proven 13 W regulation accuracy.
Được đề xuất
VoIP Phones
VoIP desk phones are classic PoE-powered endpoints, and the TPS23758RJJR matches their requirements: 802.3at Type 1 (13 W) power comfortably covers phone, display, and PoE-powered accessory loads, while integration shrinks the power section that must coexist with handset circuitry on a crowded board. The PD interface handles detection, classification, and inrush on plug-in, and the no-opto current-mode flyback generates the main 5 V rail from the PoE voltage with primary-side regulation, improving reliability by removing the optocoupler, a known aging component in always-on telephony hardware. Advanced startup ensures clean power-up from the Ethernet link, and SSFD reduces conducted EMI on building cabling. Multi-output secondary rails for display and audio can be derived with small secondary-side bucks.
Được đề xuất
PoE Lighting and LED Drivers
PoE-fed LED luminaires need a compact, efficient conversion stage from the 37 V to 57 V PoE input to LED string current, and the TPS23758RJJR provides it by pairing a fully integrated 802.3at PD interface with a current-mode flyback controller and 150-V FET, all in one 24-VSON package. Its 13 W Type 1 budget covers LED downlight and spotlight power levels, and primary-side regulation with no-opto feedback reduces component count on the lighting PCB, where thermal derating limits component stress. The current-mode architecture gives good transient response for dimming scenarios, and spread spectrum dithering limits EMI in fixtures with long output leads acting as antennas. Designers should verify output current regulation accuracy with the PSR sensing scheme at the chosen LED voltage.
Được đề xuất
Building Automation and Security Sensors
Ceiling-mounted security sensors, motion detectors, and access-control nodes increasingly run on PoE, and the TPS23758RJJR is a strong fit because its integrated 150-V FET tolerates cable transients, its no-opto PSR flyback needs minimal secondary-side circuitry for a single low-voltage logic rail, and the whole power section fits in a small area near the Ethernet jack. The PD interface executes IEEE 802.3at detection and classification automatically, while advanced startup handles boot from the link without extra sequencing circuitry. Spread spectrum frequency dithering keeps conducted emissions low on shared building cabling, which matters in dense structured-wiring closets. With a 13 W Type 1 budget, the part powers sensor heads plus local processing comfortably; ultra-low-power sensor rails can be added with small LDOs downstream.
Được đề xuất
Industrial Network Edge Devices
Industrial Ethernet edge devices such as I/O modules, gateways, and panel instruments benefit from the TPS23758RJJR's combination of a standards-compliant 802.3at PD interface and a rugged integrated 150-V switching FET, which absorbs the surges typical of factory cabling. The current-mode no-opto flyback with primary-side regulation delivers a stable 5 V or 3.3 V system rail from the PoE input without optocoupler drift, supporting long service intervals in industrial environments. Its 24-VSON (6 mm x 4 mm) package and low external component count suit DIN-rail and conduction-cooled enclosures, while SSFD dithering simplifies compliance with industrial EMC emission limits. For designs above the 13 W Type 1 budget, select a higher-power TI PoE PD part instead.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TPS23758RJJR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TPS23754 | TPS23755 |
|---|---|---|---|
| Package | 24-VSON (6 mm x 4 mm) | 24-VSON - same footprint family | 24-VSON - same footprint family |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3at | IEEE 802.3at | IEEE 802.3at family |
| Regulation | No-opto PSR | No-opto PSR | No-opto PSR |
| Cross-Brand Drop-in Availability | N/A | No - different package, external MOSFET, requires redesign | Same TI family |
Bảo phân biệt quan trọng
- Integrated 150-V power FET (vsMAX5965AATG+)
- No-opto primary-side regulation (vsOptocoupler-based PoE flyback designs)
- Spread spectrum frequency dithering (SSFD) (vsTPS23754 (fixed-frequency operation))
Ghi chú thiết kế
Follow the TPS23758EVM-080 reference layout for the hot-swap section and flyback power stage. Keep the loop from the integrated 150-V FET, transformer primary, and sense resistor as short as possible to minimize ringing; place the VSON thermal pad on a solid ground pour with a 5x5 via array for heat spreading. Route the PoE pair through the diode bridge directly to the RTN and VDD bulk capacitance before the PD section to preserve surge immunity.
Do not attempt a pin-for-pin swap with the MAX5965AATG+ or similar external-MOSFET PoE PD controllers: the TPS23758 integrates its switch, so gate-drive, current-sense, and thermal design points differ fundamentally. Also, PSR output regulation depends on auxiliary-winding turns ratio and leakage inductance; using an off-the-shelf transformer not validated for no-opto PSR will degrade load regulation. Verify class resistor settings against the target 802.3at Type 1 power budget.
Although the built-in spread spectrum frequency dithering (SSFD) reduces peak conducted emissions by spreading switching energy across the band, it does not eliminate the need for a standard PoE input EMC front end. Use the common-mode choke and Y-capacitor placement from the TI evaluation module, and keep the snubber network on the primary winding populated as recommended to damp drain-node ringing, which is a dominant radiator at the 150-V switch node.
Thông tin tuân thủ
Compliance data was not present in the provided web data. Verify RoHS/REACH status on the TI product page quality section (ti.com/product/TPS23758).
