SI3461 Silicon Laboratories, SI3461 Datasheet - Page 11

• Manufacturer Part Number: SI3461
• Description: SINGLE-PORT IEEE 802.3AT POE/POE PSE INTERFACE
• Manufacturer: Silicon Laboratories

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4. Si3461-EVB Functional Description
In combination with low-cost external components, the Si3461 controller provides a complete PSE solution for
embedded PoE applications. The Si3461-EVB reference design operates from a +50 V isolated power supply and
delivers power to the powered device through a FET switch without controlling the output voltage while in the
power-on state.
Refer to the Si3461-EVB User's Guide and schematics for descriptions in the following sections.
The basic sequence of applying power is shown in Figure 3. Following is the description of the function that must
be performed in each phase.
-15.5V
-20.5V
-2.8V
-10V
-44V
-57V
Ch1: PoE output voltage referenced to the +50V rail
Figure 3. Basic Power-up Sequence
Detection
t
DET_CYCLE
Rev. 1.0
t
CLASS_CYCLE
Classification
t
PWRUP
Power-on
Si3461
11
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