SI3461-KIT Silicon Laboratories Inc, SI3461-KIT Datasheet - Page 7

• Manufacturer Part Number: SI3461-KIT
• Description: BOARD EVAL FOR SI3461
• Manufacturer: Silicon Laboratories Inc
• Type: Controllers & Processorsr

Specifications of SI3461-KIT

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Board Type: Fully Populated
• Utilized Ic / Part: Si3461
• Ethernet Connection Type: 10/100 Base-T, IEEE 802.3
• Interface Type: Ethernet
• Operating Voltage: 12 V to 15 V
• Operating Current: 10 mA
• Product: Modules
• For Use With/related Products: Si3460
• Lead Free Status / RoHS Status: Lead free / RoHS non-compliant
• Current - Output: -
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -
• Frequency - Switching: -
• Outputs And Type: -
• Regulator Topology: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1843

6. Detailed Description of the Si3461 PSE Controller
The Si3461 is a fully IEEE compliant PoE/PoE+ PSE power management controller. The Si3461 is specifically
designed and configured to work with an applications circuit (Si3461-EVB) with which it implements a single port
PSE solution for either Midspan or Endpoint PoE applications.
Refer to the detailed evaluation board schematics in "9. Si3461-EVB Schematics" on page 16 and "11.
Si3461-EVB PCB Layouts" on page 21; the overall functionality is described below. Representative waveforms are
shown in "8. Output Voltage and Load Current Waveforms" on page 12.
6.1. Initialization and Operating Mode Configuration
The Si3461 is initialized at powerup or whenever Pin 8 (RST) is held low and then allowed to transition high. Upon
reset (RST asserted low), the voltage at the STATUS pin (as determined by the DIP switch and the associated
resistor network) is sensed to determine the operating mode of the Si3461. The detection process begins
immediately after initialization.
The following operating mode parameters can be set with the DIP switches:



DIP Switch
Configuration
Endpoint or Midspan mode controls the back off timing per IEEE specifications.
Restart action on Fault or Overload determines whether the Si3461 automatically restarts after 2 s when a fault
or overload condition (e.g., input UVLO, output short-circuit event, classification power level exceeded) is
detected or waits to restart until an open-circuit condition is sensed.
Available power level (and PSE Type specifying the classification method used).
0.122 to 0.338
0.338 to 0.548
0.548 to 0.756
0.756 to 0.961
0.961 to 1.162
1.162 to 1.366
1.366 to 1.575
1.575 to 1.784
1.784 to 1.990
1.990 to 2.196
2.196 to 2.407
2.407 to 2.618
Voltage (V)
Status Pin
< 0.122
PSE Type
Table 2. Operating Modes
1
1
1
2
1
1
1
2
1
1
1
2
1
Rev. 0.5
Midspan/
Endpoint
Endpoint
Endpoint
Endpoint
Endpoint
Endpoint
Midspan
Midspan
Midspan
Midspan
Midspan
Midspan
Midspan
Midspan
Operating Mode
Restart Action on Fault or
Overload Event Condition
Restart after disconnection
Restart after disconnection
Restart after disconnection
Restart after disconnection
Restart after disconnection
Restart after disconnection
Restart after disconnection
Restart after disconnection
Auto restart after 2 s
Auto restart after 2 s
Auto restart after 2 s
Auto restart after 2 s
Auto restart after 2 s
Si3461-EVB
Power (W)
Available
15.4
15.4
15.4
30
30
30
4
7
4
7
4
7
4
7