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SI3460 数据表(PDF) 11 Page - Silicon Laboratories

部件名 SI3460
功能描述  IEEE 802.3af PSE INTERFACE AND DC-DC CONTROLLER
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

SI3460 数据表(HTML) 11 Page - Silicon Laboratories

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Si3460
Preliminary Rev. 0.4
11
5. Si3460-EVB Functional Description
In combination with low-cost external components, the Si3460 controller provides a complete PSE solution for
embedded PoE applications. Included in the Si3460-EVB reference design is a digital PWM controller-based dc-dc
converter that simplifies overall system design by generating the –48 V PSE supply voltage. An isolated 11 to 16 V
input dc supply is all that is needed to supply the Si3460-EVB reference design. Refer to the Si3460-EVB User’s
Guide and schematics for descriptions in the following sections.
5.1. Reset State
At powerup or if reset is held low, the Si3460 is in an inactive state with the PWM turned off (the switcher FET, M1,
is off) and the pass FET, M2, is off.
5.2. Operating Mode Configuration
At powerup, the Si3460 reads the voltage on the STATUS pin, which is set by a resistor divider from VEE to chip
ground. The STATUS pin voltage level configures all of the Si3460's operating modes as summarized in Table 8.
Table 8. Operating Modes
STATUS
Pin Voltage
Operating Mode
Power Level
Supported (W)
Classes Supported
Midspan/
Endpoint
Restart Action on
Fault or Overload
Event Condition
Pin voltage at VEE
(no resistors populated)
15.4
All class levels
Endpoint
Auto restart after 2 s
3.0 V
7.0
Class 1 or 2
Endpoint
Auto restart after 2 s
2.75 V
4.0
Class 1
Endpoint
Auto restart after 2 s
2.5 V
15.4
All class levels
Endpoint
Restart on RST
2.25 V
7.0
Class 1 or 2
Endpoint
Restart on RST
2.0 V
4.0
Class 1
Endpoint
Restart on RST
1.75 V
4.0
Class 1
Midspan
Restart on RST
1.5 V
7.0
Class 1 or 2
Midspan
Restart on RST
1.25 V
15.4
All class levels
Midspan
Restart on RST
1.0 V
4.0
Class 1
Midspan
Auto restart after 2 s
0.5 V
7.0
Class 1 or 2
Midspan
Auto restart after 2 s
< 0.25 V
(pullup resistor only)
15.4
All class levels
Midspan
Auto restart after 2 s


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