Si3462-EVB Si3462 EVALUATION BOARD USERS GUIDE 1. Introduction This document is intended to be used in conjunction with the Si3462 data sheet for designers interested in the following: An introduction to Power over Ethernet (PoE) and Power Sourcing Equipment (PSE) design considerations Operation of the Si3462 PSE controller in the Si3462-EVB reference design Configuration and operation of the Si3462-EVB 2. Overview of the Si3462 and Evaluation Board The Si3462 is a single-port power management controller for IEEE 802.3at PoE/PoE+ compliant Power Sourcing Equipment (PSE). The Si3462 operates directly from a 50 V (nominal) isolated input for PoE or 54 V (nominal) isolated input for PoE+. The complete Si3462 reference design (i.e., the Si3462-EVB) also provides full IEEE- compliant classification and detection as well as a robust disconnect algorithm. Intelligent protection circuitry includes input under-voltage and over-voltage lockout (UVLO/OVLO), current limiting, and output short-circuit protection. The Si3462 is designed to operate completely independently of host processor control. A reset button and an optional LED status signal are provided to indicate port status including detect, power good, and output fault event information. The Si3462 is pin-programmable to support: No classification mode reduces bill of materials for 15.4 W operation and also for non-standard powered devices that do not present a proper classification signature Endpoint and midspan applications with support for either 10/100BASE-T or 10/100/1000BASE-T All PoE/PoE+ classification power levels Classification-based current limiting Automatic or manual restart after various fault events are detected +50 V V IN + +50 V Optional 3.3 V regulator V DD +3.3 V Detect V OUT & VDD 48 V Mark CLSMARK PSE DC1 Classification DC2 & output Gate drive CLSMODE Si3462 (to port DETA RST magnetics) VSENSE ISENSE STATUS DETECT GND FAULT PGOOD GND GND Figure 1. Typical Application Circuit (Example is for PoE for PoE+, use +54 V nominal V ) IN Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 27, 2021Si3462-EVB 3. Connectors and Switches The Si3462-EVB is equipped with two banana jacks and an optional third banana jack on one side and two RJ-45 connectors on the other side. Figure 2. Placement of Connectors and Switches The board receives power through the banana jacks: J1 BLACK banana jack: GND J2 RED banana jack: +50 V nominal input (+45 V to +57 V) for PoE +54 V nominal input (+51 V to +57 V) for PoE+ J3 Optional banana jack: +3.3 V input An optional onboard +3.3 V shunt regulator generates the supply voltage for the Si3462 from the +50 V input voltage. The +3.3 V supply voltage may also be provided by an external source through the optional banana jack if higher efficiency is desired. In this case, the regulator and its associated resistors (including the series resistors) should be removed. The RJ-45 Ethernet connectors: J7 ETHERNET IN input J8 PoE output Reset pushbutton: SW1 Mode setting DIP switch: SW2 These switches set the operating mode according to Table 2 on page 7 including the following: Available power level (4 W, 7 W, 15.4 W, and 30 W) Midspan or Endpoint configuration Automatic restart or restart after disconnection modes of operation Refer to6.1. Initialization and Operating Mode Configuratio on page 7 for more details. 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 27, 2021