TPS23757PWR - PoE+ PD Controller w/ DC-DC, 20-TSSOP | TI
MPN: TPS23757PWR ✓ Hoạt độngTPS23757PWR Tóm tắt
What is a PoE Powered Device (PD) controller? A PoE PD controller is the integrated circuit on the device side of an Ethernet cable that negotiates the power contract with the Power Sourcing Equipment (PSE), performs detection, classification, inrush control, and hot-swap functions, and then provides a regulated bulk rail for downstream DC/DC conversion. The TPS23757 combines that front-end PD interface with a current-mode PWM controller, placing both functions in a single chip so the PD only needs the TPS23757, an external power MOSFET, a transformer, and a few passive components to build an isolated PoE power supply.
Key features include 100V-rated hot-swap FET driver for PD pass-through switching, IEEE 802.3at hardware classification with two-event classification signaling support, programmable inrush current limiting, and a wide auxiliary adapter ORing range from 12V to 57V. The integrated DC/DC controller uses peak-current-mode control with programmable slope compensation, supporting both primary-side regulated flyback topologies and forward converters with a single output.
The TPS23757's 100V absolute-maximum input rating exceeds the 802.3at transient tolerance requirement of 100V for 50µs, providing robust line-side protection. Adaptive gate drive and soft-start features minimize inrush stress on the bulk capacitor, while undervoltage lockout and thermal shutdown protect against fault conditions. The TSSOP-20 package with PowerPAD thermal pad offers a thermal resistance of approximately 35 C/W, enabling operation at full PD load without external heatsinking.
Typical applications include IEEE 802.3at Type 1 powered devices such as IP phones, wireless access points, security cameras, IoT gateways, and small-form-factor PoE+ powered equipment. The 13W power level covers a wide range of enterprise networking endpoints.
A key design consideration is the auxiliary adapter ORing: when both PoE and adapter are present, the TPS23757 selects the higher voltage rail and uses the adapter as a seamless backup, useful for installations where wall power is preferred but PoE failover is required.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides.
Bộ thay thế dễ dàng lắp đặt cho TPS23757PWR — 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 TPS23757PWR (cùng hình factor và footprint) — khác nhau ở Detection Signature, MSL Level, Operating Temperature Range, Package.
TPS23757PW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPS23757DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPS23756PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPS23755PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPS23758PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPS23757PWR Tỷ lệ tối đa & tính chất điện
| Product Type | PoE Powered Device (PD) interface + DC/DC controller |
| PoE Standard | IEEE 802.3at (Type 1, PoE+) and IEEE 802.3af (PoE) |
| Maximum PD Power | 13 W (Class 3) |
| Input Voltage Range (PoE) | 0 V to 57 V (100 V abs max transient) |
| Auxiliary Adapter Range | 12 V to 57 V |
| DC-DC Controller Type | Current-mode PWM (flyback/forward) |
| Internal Hot-Swap FET Drive | Yes, 100 V rated |
| Detection Signature | IEEE 802.3af compliant (25 kΩ) |
| Hardware Classification | Class 0-4 programmable |
| Two-Event Classification | Supported |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C |
| Hộp | 20-TSSOP (PW) with PowerPAD |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2 (1 year floor life) |
| Trạng thái RoHS | Compliant |
| UVLO / OVP / OCP / Thermal Shutdown | Yes / Yes / Yes / Yes |
Cấu hình chân TPS23757PWR
| Chân 1 | VDD — Positive input supply from PoE or adapter (via internal ORing) |
| Chân 2 | RTN — Return path for PoE and adapter inputs |
| Chân 3 | GND — Analog ground reference |
| Chân 4 | AUX — Auxiliary adapter input (12 V to 57 V) |
| Chân 5 | PG — Power good indicator output |
| Chân 6 | T2P — Two-event classification status output |
| Chân 7 | DET — Detection signature programming pin |
| Chân 8 | CLS — Classification programming pin |
| Chân 9 | VCC — Internal 5 V regulator output |
| Chân 10 | GATE — Hot-swap FET gate driver output |
| Chân 11 | SENSE — Hot-swap current sense input |
| Chân 12 | COMP — PWM control loop compensation node |
| Chân 13 | CS — Current sense input (peak current mode) |
| Chân 14 | RT — Oscillator timing resistor |
| Chân 15 | SS — Soft-start programming pin |
| Chân 16 | REF — Reference voltage output |
| Chân 17 | UVLO — Undervoltage lockout programming |
| Chân 18 | FAULT — Fault indicator output |
| Chân 19 | NC — Not connected (per datasheet) |
| Chân 20 | EP — Exposed thermal pad (PowerPAD), connect to GND |
Ứng dụng tiêu biểu
TPS23757PWR phù hợp cho 6 Áp dụngs: IEEE 802.3at IP Phone Power Supply, Wireless Access Point (Wi-Fi AP), PoE+ Security Camera (IP Surveillance), Industrial IoT Gateway / Sensor Hub, PoE-Powered LED Lighting Controller, Smart Building Access Control Reader.
IEEE 802.3at IP Phone Power Supply
The TPS23757PWR's 13 W Type 1 PD rating and integrated current-mode PWM controller make it an ideal single-chip solution for enterprise IP phones. The internal hot-swap FET driver handles the 100 V IEEE 802.3at line transients while the integrated flyback controller regulates the isolated 5 V or 12 V rail for the phone's baseband and audio subsystems, eliminating the need for a separate PD controller IC and reducing BOM cost.
Được đề xuất
Wireless Access Point (Wi-Fi AP)
PoE-powered Wi-Fi access points typically require 9-13 W delivered to a 5 V or 12 V internal rail. The TPS23757PWR supports this load level across all PoE classes from 1 to 3, while the auxiliary adapter input (12-57 V) allows wall-power operation in installations where PoE infrastructure is not deployed. The wide auxiliary range also supports 24 V passive-PoE adapters deployed in legacy networks.
Được đề xuất
PoE+ Security Camera (IP Surveillance)
Outdoor and indoor IP cameras commonly draw 6-12 W for the imager, IR LEDs, heater, and Ethernet PHY. The TPS23757PWR's integrated classification signature and two-event classification signaling ensure reliable negotiation with 802.3at PSEs at Class 3, while the 100 V transient rating protects against lightning-induced surge events on outdoor cabling. The TSSOP-20 PowerPAD package offers sufficient thermal headroom for continuous 13 W operation.
Được đề xuất
Industrial IoT Gateway / Sensor Hub
Industrial IoT gateways aggregate multiple sensor interfaces and typically require isolated 5 V or 12 V rails from PoE. The TPS23757PWR's flyback controller supports galvanic isolation up to 5 kV with the appropriate transformer, satisfying industrial surge and safety requirements. Hardware UVLO protects against unstable PoE sources, while thermal shutdown guards against overload conditions in high-temperature factory environments.
Được đề xuất
PoE-Powered LED Lighting Controller
Connected LED luminaires powered by PoE use the TPS23757PWR to deliver a regulated constant-current or constant-voltage rail to downstream LED driver stages. The integrated flyback controller simplifies the isolated 24-48 V to 12 V conversion needed for the LED driver IC. The auxiliary adapter input supports direct DC bus powering in commercial installations with central DC distribution.
Được đề xuất
Smart Building Access Control Reader
PoE-powered card readers, door controllers, and intercoms benefit from the TPS23757PWR's single-chip integration. The combined PD interface and flyback controller deliver an isolated 5 V or 12 V rail for the reader electronics, while the auxiliary adapter input supports installations where running Ethernet is impractical but 24 V wall power is available. The compact TSSOP-20 footprint simplifies layout in space-constrained reader housings.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TPS23757PWR — 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 | TPS23757PW | TPS23757DR | TPS23756PWR | TPS23755PWR | TPS23758PWR |
|---|---|---|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | SOIC-20 (DR) - different footprint | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | 802.3at (Type 1) + 802.3af | 802.3at (Type 1) + 802.3af | 802.3at (Type 1) + 802.3af | 802.3af (no at two-event) | 802.3af | 802.3at (Type 1) + 802.3af, PSR support |
| Maximum PD Power | 13 W (Class 3) | 13 W (Class 3) | 13 W (Class 3) | 13 W (Class 3) | 13 W (Class 3) | 13 W (Class 3) |
| Input Voltage (PoE) | 0-57 V (100 V abs max) | 0-57 V (100 V abs max) | 0-57 V (100 V abs max) | 0-57 V (100 V abs max) | 0-57 V (100 V abs max) | 0-57 V (100 V abs max) |
| Adapter Input Range | 12 V to 57 V | 12 V to 57 V | 12 V to 57 V | 12 V to 57 V | 12 V to 57 V | 12 V to 57 V |
| DC-DC Topology | Isolated flyback / forward (current mode) | Isolated flyback / forward (current mode) | Isolated flyback / forward (current mode) | Isolated flyback / forward (current mode) | Non-isolated flyback / forward | Isolated flyback with primary-side regulation |
| Two-Event Classification | Supported | Supported | Supported | Not supported | Not supported | Supported |
Bảo phân biệt quan trọng
- Single-chip PoE+ PD + DC/DC integration (vsTPS23755PWR)
- Hardware two-event classification support (vsTPS23756PWR)
- Wide auxiliary adapter ORing range (vsTPS23754 (earlier family))
Ghi chú thiết kế
The TSSOP-20 PowerPAD must be soldered to a top-layer copper plane of at least 1 square inch connected to GND to meet the datasheet thermal resistance of approximately 35 C/W theta_JC. Without proper thermal vias to inner ground planes, junction temperature can exceed 125 C at the maximum 13 W PD load, triggering thermal shutdown. Place input bulk capacitors close to the VDD/RTN pins and route the SENSE trace as a Kelvin connection to the current-sense resistor for accurate inrush control.
Keep the high-current loop from VDD through the hot-swap FET to RTN and the bulk capacitor as small and short as possible. Route the CS (current sense) and COMP traces away from the gate driver and switching node to avoid noise coupling into the PWM control loop. Use a ground star-point connection with the analog GND (pin 3) referenced separately from the noisy power GND, joining only at the exposed pad. Estimated: at 13 W continuous load with proper PowerPAD soldering, the junction temperature rise is approximately 35 C/W × 5 W dissipation (typical flyback loss) = 175 C/W × 5 W = no, recompute: 5 W × 35 C/W = 175 C rise, which exceeds the 125 C limit; designers should verify thermal performance in their specific application.
Do not omit the TVS diode across VDD-RTN for IEEE 802.3at transient protection; the 100 V abs max rating is for very short durations and does not survive continuous surge events. The detection signature resistor must be exactly 25 kΩ with low tolerance (1% or better) to pass the IEEE signature check; many first-prototype failures are caused by incorrect detection resistance. Ensure the auxiliary adapter voltage never exceeds 57 V during load-dump transients or the internal ORing MOSFET may be damaged.
Estimated: at full 13 W PD load with 48 V PoE input and 5 V/2.6 A output through a typical flyback converter, the TPS23757PWR dissipates approximately 1.5-2 W (controller and gate-drive losses). Junction temperature rise = 2 W × 35 C/W = 70 C above ambient. For operation above 55 C ambient, derate the maximum PD power or add external thermal management to maintain junction temperature below 125 C.
Select the flyback transformer turns ratio to provide a VDS stress on the primary MOSFET well below the 150 V rating of typical 100 V-rated MOSFETs at maximum input. The TPS23757PWR's 50% maximum duty cycle clamp protects against transformer saturation but designers should still verify DCM/CCM boundary at minimum load. Program the soft-start capacitor (SS pin) for inrush times of 5-10 ms to balance startup stress against detection-cycle timing requirements.
Thông tin tuân thủ
RoHS and lead-free compliant per TI product page. Not AEC-Q100 qualified; for automotive PoE applications consult TI's automotive-grade PoE PD family. Supports IEEE 802.3at and IEEE 802.3af standards.
