This document introduces Silicon Laboratories Si3480MS8-KIT EVALUATION KIT USER’S GUIDE FOR THE Si3480 POWER MANAGEMENT CONTROLLER, which is a power management controller that enables the use of smaller, lower-cost, and more efficiently-utilized power supplies in unmanaged PSE systems with up to eight ports.
This guide provides an overview of the Si3480MS8‑KIT evaluation board, which includes the Si3480 power‑management controller, two Si3452 PoE controllers, status LEDs, and Ethernet coupling circuitry. It describes how to connect a power supply, configure jumper settings, and use the supplied load boards to demonstrate PoE and PoE+ operation.
Key functions covered are the LED status indicators, port‑priority shutdown, overload protection, and how to scale the system for higher‑power applications. Detailed schematics, a bill of materials, and layout diagrams are also included for hardware designers.
| Power‑supply voltage (PoE+) | 51 V – 57 V |
|---|---|
| Power‑supply voltage (normal) | 45 V – 57 V |
| Power‑supply wattage range | 30 W – 150 W |
| Jumper setting 0001 (J1‑J2‑J3) | 0.22 V → 13.3 W |
| LED overload indication | Flashing five times per second |
| Port shutdown rule | Ports turned off in priority order when power exceeds limit |
| Power‑meter LED calculation | Number_LEDs_Lit = 8 × Total_Power_Consumed / (0.85 × Provided_Power – 4 W) |
The supply voltage should be between 51 V and 57 V for PoE+ operation.
When a port is overloaded, its status LED flashes five times per second.
Ports are turned off in priority order; low‑priority ports shut off immediately if consumption exceeds the available power.
Eight power‑meter LEDs light in a bar‑graph fashion, calculated by the formula Number_LEDs_Lit = 8 × Total_Power_Consumed / (0.85 × Provided_Power – 4 W).