TPS23751PWPR - 802.3at PoE+ PD Interface & Flyback Controller | TI
MPN: TPS23751PWPR ✓ Hoạt độngTPS23751PWPR Tóm tắt
A Power-over-Ethernet powered-device interface is the front-end circuit that negotiates and validates power delivery over Ethernet cabling per the IEEE 802.3af/at standards, handling detection, classification, and inrush current limiting before an isolated or non-isolated DC-DC converter converts the 37 V to 57 V PoE rail to system voltages. In the power-management hierarchy it sits between the Ethernet magnetics/diode bridges and the system power tree.
Key features include hardware type-2 classification per IEEE 802.3at, an auxiliary power detect (APD) input that enables seamless switchover between PoE and wall-adapter power, and a current-mode PWM controller optimized for high efficiency across wide load ranges, supporting both flyback and synchronous flyback topologies. The integrated thermal protection and precision 25.5 W class-4 signature support full PoE+ designs such as wireless access points and IP security cameras.
Technically, the PoE section implements detection, classification, and a controlled inrush path with a pass device, while the controller section uses peak current-mode control with programmable oscillator frequency, enabling optimized transformer designs and high light-load efficiency - important for energy-efficient (Energy-Efficient Ethernet adjacent) designs.
Typical applications include 802.3at PoE+ wireless access points, IP phones, IP surveillance cameras, and networked industrial equipment that must draw power from the Ethernet cable or fall back to auxiliary adapter power.
Design consideration: keep the detection and classification resistor networks within IEEE tolerance, and use the PowerPAD soldered to a copper pour for thermal dissipation at full PoE+ load.
This page synthesizes distributor data, the TPS23750 comparison, and practical PoE design notes not found in the datasheet. Pricing shown is as of 2026-10-19.
Bộ thay thế dễ dàng lắp đặt cho TPS23751PWPR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
TPS23750PWPR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPS23751PWPR Tỷ lệ tối đa & tính chất điện
| Chức năng | PoE PD Interface + Current-Mode Flyback DC-DC Controller |
| PoE Standard | IEEE 802.3at (PoE+, Type 2) and IEEE 802.3af (PoE) |
| PoE Power Class | Type 2 / Class 4, up to 25.5 W at the PD |
| Phạm vi điện áp đầu vào | 0 V to 57 V (PoE PD input) |
| Number of Channels | 1 |
| Control Topology | Current-mode PWM, flyback / synchronous flyback |
| Auxiliary Power Detect (APD) | Yes |
| Disable Input | Yes |
| Hardware Classification | Type-2 hardware classification per IEEE 802.3at |
| Hộp | 16-pin HTSSOP (PWP) with PowerPAD |
| Kiểu lắp đặt | Surface Mount |
| Marking Code | 23751 |
| Typical Applications | Wireless access points, IP phones, IP cameras |
| Typical Output Power | 25.5 W |
Hướng dẫn cấu hình chân TPS23751PWPR 16-pin htssop (pwp) with powerpad
Cấu hình chân cho TPS23751PWPR (16-pin htssop (pwp) with powerpad 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 TPS23751PWPR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
TPS23751PWPR phù hợp cho 6 Áp dụngs: IEEE 802.3at PoE+ Wireless Access Points, IP Network Cameras, VoIP and Video IP Phones, PoE Splitter and Midspan Adapter Designs, Industrial Networked Equipment, Building Automation and LED Lighting over Ethernet.
IEEE 802.3at PoE+ Wireless Access Points
Wireless access points are the flagship 802.3at application: dual-radio 802.11ac/ax APs routinely consume 15 W to 25 W, which exceeds the 12.95 W usable limit of 802.3af and requires class-4 PoE+ power. The TPS23751PWPR fits because its type-2 hardware classification presents a compliant 25.5 W signature to the PSE, and its current-mode flyback controller converts the 37 V to 57 V PoE rail efficiently across the AP's wide load range, from idle beacons to full radio duty. TI's reference design explicitly targets synchronous flyback converters with this part for wireless access points, using secondary-side synchronous rectification to cut rectification loss at 25.5 W output. The APD input also lets the AP run from a wall adapter where a PoE+ switch port is unavailable.
Được đề xuất
IP Network Cameras
IP surveillance cameras with IR illuminators, heaters, and PTZ motors draw bursty loads well above 802.3af capability, making 802.3at class-4 power the practical standard for outdoor and PTZ dome cameras. The TPS23751PWPR provides the compliant 25.5 W type-2 signature, robust detection and inrush limiting on long cable runs, and a current-mode flyback controller that tolerates the camera's rapid load transients when IR LEDs or motors engage. Its wide-load-range efficiency optimization keeps conversion losses low during the camera's mostly-idle standby periods, reducing internal heat in sealed outdoor housings. The auxiliary power detect input supports hybrid installations where local adapter power is used during commissioning before the PoE link is established.
Được đề xuất
VoIP and Video IP Phones
Enterprise IP phones - especially videophones with color touchscreens and gigabit switches - draw 13 W to 25 W, requiring 802.3at class-4 power. The TPS23751PWPR's hardware type-2 classification ensures the phone is allocated full PoE+ budget by the switch, while its integrated flyback controller generates the phone's multiple low-voltage rails (3.3 V, 5 V, 1.x V cores) from the PoE input in a compact isolated or non-isolated flyback stage. Because phones sit on-desk with limited airflow, the HTSSOP PowerPAD package helps manage thermal dissipation. The APD input enables the common corporate deployment pattern of powering conference phones from local adapters where PoE switch capacity is constrained, with automatic fallback to PoE when the adapter is removed.
Được đề xuất
PoE Splitter and Midspan Adapter Designs
PoE splitters extract power from an Ethernet cable and deliver a regulated DC output to non-PoE devices such as legacy cameras, access points, and thin clients. The TPS23751PWPR serves as the complete splitter power stage: its PD interface performs detection, classification, and inrush control, and its current-mode flyback controller generates the isolated or non-isolated output rail at up to 25.5 W. Type-2 classification lets splitters legitimately request PoE+ budget for high-power endpoint devices. Current-mode control simplifies transformer design and gives robust short-circuit behavior, important in field-deployable accessories. The wide-load-range efficiency optimization keeps no-load and light-load losses low, which matters for splitters that remain plugged in when the endpoint is off.
Được đề xuất
Industrial Networked Equipment
Industrial Ethernet nodes - I/O blocks, gateways, sensors, and panel displays - increasingly deploy 802.3at power to simplify cabling in factories and buildings. The TPS23751PWPR's 0 V to 57 V input tolerance and robust PD front end handle long cable runs and noisy industrial Ethernet environments, while its flyback controller produces the isolation traditionally required by industrial fieldbus equipment. Hardware type-2 classification guarantees full 25.5 W allocation even on shared PSE budgets. The disable input permits system-level power gating for maintenance or energy-saving modes. Its combination approach replaces a two-chip PD-plus-PWM bill of materials, reducing qualification effort in equipment that must meet both IEEE 802.3at power compliance and industrial EMC requirements.
Được đề xuất
Building Automation and LED Lighting over Ethernet
LED luminaires, occupancy sensors, and HVAC controllers powered via structured cabling form a growing PoE building-automation segment; 802.3at class-4 power at 25.5 W covers typical luminaires and sensor clusters. The TPS23751PWPR implements the required compliant PD signature and its current-mode flyback converter efficiently steps the PoE voltage down for LED strings and controller logic across the load range from dimmed-idle to full output. The APD input supports hybrid installations combining emergency-lighting battery/adapter backup with normal PoE feed, switching sources per code requirements. Integration of the PD interface and PWM controller in one 16-pin HTSSOP keeps luminaire driver boards compact enough to fit inside standard fixture housings while the PowerPAD aids thermal management in enclosed luminaires.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TPS23751PWPR — 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 | TPS23750PWPR |
|---|---|---|
| Package | 16-HTSSOP (PWP) | 16-HTSSOP (PWP) - same |
| Brand | Texas Instruments | Texas Instruments |
| PoE Standard | 802.3at (PoE+) and 802.3af, Type 2 hardware classification | 802.3af era, without full type-2 classification |
| Integrated PWM Controller | Yes, current-mode flyback/synchronous flyback | Yes, same architecture |
| Typical Applications | PoE+ access points, IP cameras, IP phones | 802.3af access points, IP phones |
Bảo phân biệt quan trọng
- Full 802.3at type-2 hardware classification for 25.5 W PoE+ (vsTPS23750PWPR)
- Single-chip PD interface plus flyback PWM controller (vsTPS2375-1)
- Auxiliary power detect (APD) input (vsTPS23750PWPR)
Ghi chú thiết kế
The 16-pin HTSSOP (PWP) PowerPAD is the primary heat-removal path for the TPS23751PWPR. At a full class-4 25.5 W output with realistic flyback efficiency, several watts are dissipated across the IC, pass device, and transformer. Solder the PowerPAD to a grounded copper pour with a via array to internal ground planes; an unsoldered or under-sized pad will cause excessive junction temperature and can trip thermal protection under sustained PoE+ load. Follow the PWP PowerPAD land-pattern dimensions in the TI datasheet.
Keep the detection and classification resistor networks close to the TPS23751PWPR pins and within IEEE 802.3at tolerance, since out-of-tolerance signatures cause PSE power denial. Place the flyback power loop (transformer, switching FET, current-sense resistor, output rectifier) compactly to minimize ringing and EMI; use the APD and disable pins with proper pull networks per the TI reference design (TPS23751 synchronous flyback reference design for wireless access points and IP phones). The input diode bridge that gives polarity insensitivity adds conduction loss - budget it in efficiency calculations.
Do not treat the TPS23751PWPR as interchangeable with the TPS23750PWPR in 25.5 W designs: the TPS23750PWPR lacks full 802.3at type-2 hardware classification, and a PSE will allocate only af-class power, causing brownouts at full AP or camera load. Also verify that the auxiliary adapter voltage and the PoE rail sequencing at the APD/oring network match the datasheet switchover thresholds, or the device may oscillate between sources. Confirm marking code 23751 on received parts to avoid counterfeit PD interfaces.
Thông tin tuân thủ
Compliance status was not stated in the retrieved web data; confirm RoHS/REACH status on the TI product page at ti.com/product/TPS23751.
