TPS23755RJJT - 802.3at PoE PD + Flyback Controller | TI
MPN: TPS23755RJJT ✓ Hoạt độngTPS23755RJJT Tóm tắt
A PoE powered-device interface controller is a power management IC that performs the detection, classification, inrush current limiting, and undervoltage-lockout functions demanded by the IEEE 802.3at standard, then hands off the validated power to an isolated or non-isolated DC-DC converter stage. It sits between the RJ45 Ethernet port and the converter, forming the entry point of the PD power architecture.
Key features include full IEEE 802.3at Type 2 compliance with two-event classification, an internal 150 V power MOSFET that eliminates a discrete switching FET, primary-side regulation (PSR) that removes the optocoupler and secondary feedback circuitry, and spread spectrum frequency dithering (SSFD) for reduced EMI. Advanced startup supports bias from the auxiliary (adapter) power path.
The current-mode flyback controller integrates the control loop, oscillator, and drivers, enabling compact, low-component-count designs. PSR senses output voltage from the primary-side auxiliary winding, simplifying the transformer and secondary circuit while supporting regulated isolated outputs typical of 5 V and 12 V PD loads.
Typical applications include IP security cameras, wireless access points, VoIP phones, and network-connected LED lighting drivers powered directly from the Ethernet cable.
Design consideration: provide adequate copper area under the VSON exposed pad for thermal dissipation and follow the datasheet PCB layout guidelines for the switching loop to limit EMI.
This page synthesizes distributor sourcing data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho TPS23755RJJT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TPS23755RJJT (cùng hình factor và footprint) — khác nhau ở Function, Package, PoE Standard, Regulation Topology.
TPS23754RJJR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TPS23756RJJR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TPS23755RJJR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TPS23755RJJT Tỷ lệ tối đa & tính chất điện
| Chức năng | IEEE 802.3at PoE PD interface + no-opto flyback DC-DC controller |
| PoE Standard | IEEE 802.3at (Type 2) |
| Phạm vi điện áp đầu vào | up to 57 V (PoE PD input) |
| Output Power | 13 W |
| Integrated Power FET | Yes, 150 V switching MOSFET |
| Regulation Topology | Flyback, current mode |
| Feedback Method | Primary-side regulation (PSR), no optocoupler |
| EMI Reduction | Spread spectrum frequency dithering (SSFD) |
| Classification | IEEE 802.3at two-event classification |
| Startup | Advanced startup with auxiliary (adapter) support |
| Hộp | 24-VSON CLCC (6x4 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Hướng dẫn cấu hình chân TPS23755RJJT 24-vson clcc (6x4 mm) with exposed pad
Cấu hình chân cho TPS23755RJJT (24-vson clcc (6x4 mm) with exposed pad 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 TPS23755RJJT.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
TPS23755RJJT phù hợp cho 6 Áp dụngs: IP Security Cameras, Wireless Access Points, VoIP Phones, PoE LED Lighting Drivers, Building Automation and IP Intercom Nodes, Network-Attached Industrial Sensors and IoT Gateways.
IP Security Cameras
IP cameras are the classic 802.3at powered device: the camera draws all operating power from the Ethernet cable, so the PD interface and converter must be compact and efficient. The TPS23755RJJT fits because its integrated 150 V FET and no-opto flyback controller collapse the PD front end and power stage into one 6x4 mm VSON package, delivering around 13 W sufficient for camera sensor, ISP, IR illuminators, and pan-tilt motors. Primary-side regulation removes the optocoupler, cutting BOM cost in cost-sensitive camera designs, while spread spectrum frequency dithering reduces conducted EMI on the same cable that carries video data. Placed directly after the RJ45 diode bridge, the device performs detection, two-event classification, and inrush control per IEEE 802.3at before flyback conversion.
Được đề xuất
Wireless Access Points
Enterprise and outdoor wireless access points typically operate at the 802.3at 13 W class to support multiple radios plus Ethernet switching. The TPS23755RJJT suits this load level with its Type 2 two-event classification and integrated 150 V switching FET, providing the PD handshaking and flyback power conversion from the 57 V PoE input. EMI is a critical concern because switching harmonics can degrade sensitive RF receiver performance; the device's spread spectrum frequency dithering (SSFD) spreads switching energy to simplify compliance and protect radio sensitivity. The no-opto primary-side regulation reduces secondary-side part count, valuable in the dense layouts of ceiling-mounted APs, and advanced startup allows operation from a local auxiliary adapter in deployments where Ethernet power is unavailable or as backup power.
Được đề xuất
VoIP Phones
VoIP desk phones are powered from the PoE switch through the same cable that carries audio, normally at 802.3af or 802.3at power levels. The TPS23755RJJT provides the complete PD interface - detection, classification, inrush limiting - plus a current-mode flyback converter with an integrated 150 V FET, converting the 48 V nominal PoE rail to the phone's internal 5 V and 3.3 V domains at up to about 13 W. Primary-side regulation eliminates the optocoupler, reducing component count on the small handset PCB area, and the exposed-pad VSON package dissipates heat into the ground plane without a heatsink. Its spread spectrum dithering also helps meet EMC requirements for telephony equipment placed near audio circuits sensitive to narrowband switching tones.
Được đề xuất
PoE LED Lighting Drivers
Networked LED luminaires increasingly draw power over Ethernet, using the PoE pair both for control data (DALI-like or IP control) and for power. The TPS23755RJJT handles the IEEE 802.3at PD interface and, with its integrated 150 V FET and flyback controller, can generate an isolated bus that feeds a constant-current LED stage at the roughly 13 W class typical of downlights and panel lights. Primary-side regulation keeps the driver board thin enough for luminaire housings, and spread spectrum frequency dithering minimizes visible flicker-inducing EMI near LED strings. The 57 V input tolerance covers the full PoE voltage range, while auxiliary startup allows lamps to operate from a local driver during installation testing before the network connection is live.
Được đề xuất
Building Automation and IP Intercom Nodes
Building automation controllers, door controllers, and IP intercom panels are commonly powered via PoE for simplified cabling. The TPS23755RJJT is a fit because it integrates the 802.3at PD interface with a no-opto flyback converter and a 150 V internal FET in one 6x4 mm package, producing around 13 W for the processor, lock drivers, audio amplifier, and display of an intercom node. Isolated flyback output protects low-voltage user-accessible circuitry, required in intercom and access-control installations. Two-event Type 2 classification guarantees full power allocation from the PSE, and the device's advanced startup supports auxiliary battery or adapter backup so doors and emergency communication remain functional during PoE switch outages - a frequent requirement in life-safety-oriented building systems.
Được đề xuất
Network-Attached Industrial Sensors and IoT Gateways
Industrial IoT gateways and sensor concentrators often use PoE to combine power and data over one cable in factories and outdoor cabinets. The TPS23755RJJT delivers the IEEE 802.3at PD interface plus a 13 W-class isolated flyback stage from a 57 V input with an integrated 150 V FET, providing the isolation barrier needed between the Ethernet plant network and field-side electronics. Primary-side regulation and SSFD address the two dominant industrial concerns: board area inside sealed enclosures and EMC robustness alongside motor-drive noise. The VSON exposed-pad package conducts heat into the chassis through the ground plane, aiding operation across elevated cabinet ambient temperatures. Auxiliary input startup also permits redundant local power in applications where the network switch may be serviced independently.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TPS23755RJJT — 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 | TPS23754RJJR | TPS23756RJJR | TPS23755RJJR |
|---|---|---|---|---|
| Package | VSON CLCC-24 (6x4 mm) EP | VSON CLCC-24 (6x4 mm) - same | VSON CLCC-24 (6x4 mm) - same | VSON CLCC-24 (6x4 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3at (Type 2) | IEEE 802.3at | IEEE 802.3at | IEEE 802.3at |
| Lifecycle Status | Active | Active | Active | Active |
Bảo phân biệt quan trọng
- No-opto primary-side regulation (vsTPS23754RJJR)
- Integrated 150 V power FET (vsTPS23756RJJR)
- Spread spectrum frequency dithering for EMI (vsTPS23755RJJR)
Ghi chú thiết kế
Estimated: at 13 W output with typical 85% flyback efficiency, input power is about 15.3 W and losses near 2.3 W, a large share dissipated in the exposed pad of the VSON package. Provide a solid ground plane with multiple thermal vias (0.3 mm drill, filled or array) directly under the pad to conduct heat into inner copper layers. Verify junction temperature against the datasheet limit at worst-case ambient, and increase copper area if the enclosure restricts airflow.
Keep the flyback power loop - transformer primary, integrated 150 V FET, and sense resistor - as short and tight as possible to minimize switching-node ringing and radiated EMI. Place the input bulk and 0.1 uF decoupling capacitors close to VDD/RTN. Route classification and inrush sense traces away from the switching node, and follow the TI datasheet PCB layout example for the TPS23755 reference design, which shows the recommended component placement for PSR feedback stability.
The spread spectrum frequency dithering (SSFD) of the TPS23755 lowers peak conducted emissions, but PoE magnetics still dominate low-frequency common-mode noise. Use a common-mode choke between the diode bridge and the transformer per the datasheet application circuit, and keep the transformer's Y-capacitor connection back to the protected chassis ground short. Pre-scan with a near-field probe around the transformer and hot loop before formal conducted-emissions testing.
Do not omit the IEEE 802.3at two-event classification resistors; misclassification limits the PSE-allocated power and can starve the converter at full load. Ensure the auxiliary adapter diode-OR path respects the datasheet priority scheme so the adapter does not back-feed the PoE port. Finally, build the PCB footprint from the datasheet pin configuration table - some distributor listings cite 23 signal pins plus the exposed pad - rather than from generic VSON-24 footprints.
Thông tin tuân thủ
RoHS compliance per standard TI offering for this part; detailed REACH, halogen, and conflict-minerals status should be confirmed via TI's product page quality/environmental data.
