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SI3460-EVB 데이터시트(PDF) 11 Page - Silicon Laboratories |
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SI3460-EVB 데이터시트(HTML) 11 Page - Silicon Laboratories |
11 / 22 page 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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