SI3454 Просмотр технического описания (PDF) - Silicon Laboratories

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SI3454

QUAD IEEE 802.3AT POE PSE CONTROLLER

Silicon Laboratories 

Si3454

Table 1. PSE Port Interface Recommended Operating Conditions1 (Continued)

Parameter

Symbol

Test Condition

Min Typ Max Unit

Measurement Accuracy

Voltage Measurement

VPWR

Current Measurement

I (IPORT)

Bad FET Measurement (Port

Voltage at the Beginning of

Detection that Causes a Bad

FET Indication)

VPORTn

IPORTn

VPWR = 50 V

IPORT = 7.5 mA

IPORT = 350 mA

IPORT = 700 mA

Force port voltage

47.5 — 52.5 V

5

7.5

10 mA

335 350 365 mA

670

—

730 mA

–20 –15 –10 V

Force current through sense

resistor

0.5

2.0

4.0 mA

Notes:

1. Port voltages are referenced with respect to VPWR. All other voltages are referenced with respect to GND. These

specifications apply over the recommended operating voltage and temperature ranges of the device unless noted

otherwise. Typical performance is for TA = 25 °C, VDD = AGND + 3.3 V, AGND and DGND = 0 V, and VPWR at 48 V.

2. For a description of the detailed behavior of VDD UVLO, see “4.2.2. Global Event Register and Global Event COR

(0x02, 0x03)” .

3. Positive values indicate currents flowing into the device; negative currents indicate current flowing out of the device.

Table 2. DC-DC Converter Recommended Operating Conditions

Parameter

Regulator Input Voltage

DC-DC Switcher

Output Current

Regulator Output Voltage

Regulator Output Current

Symbol

VCAP

ILOAD

VDDA

IDDA

Test Condition

Min

Typ

Max

Unit

—

3.6

4.3

4.6

V

—

0.1

—

200

mA

55 mA load

—

3.0

3.3

3.6

V

0.1

—

55

mA

Rev. 1.1

7

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