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Si3452B-B01-GM датащи(PDF) 5 Page - Silicon Laboratories

номер детали Si3452B-B01-GM
подробное описание детали  QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE PSES
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
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Si3452B-B01-GM датащи(HTML) 5 Page - Silicon Laboratories

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Si3452/3
Rev. 1.0
5
Table 2. Recommended Operating Conditions
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
Ambient operating tem-
perature
TA
“–GM” part numbers
–10
85
°C
“–IM” part numbers
–40
85
Thermal impedance*
θ
JA
No airflow
32
°C/W
1 m/s airflow
28
Power Supply Voltages
VEE supply voltage
VEE
For IEEE 802.3af (15.4 W) apps.
–57
–48
–45
V
For IEEE 802.3at (30 W) apps.
–57
–54
–51
VDD supply voltage
VDD
3.0
3.3
3.6
V
Power Supply Currents
VEE supply current
IEE
All ports on, excluding load current.
3.7
6.0
mA
All ports in shutdown mode
1
2
VDD supply current
IDD
—8
14
mA
*Note: Modeled with six parts evenly spaced on a 30 x 120 mm2, four-layer board with 25 thermal vias to a Vneg plane on the
back.
Table 3. UVLO, and Reset Specifications
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
VDD reset threshold
VRST
—2.2
V
VDD power-on ramp
*
Ramp from 0 V to 3.0 V
1
ms
RST input high voltage
0.7 x VDD
——
V
RST input low voltage
0.8
V
RST input leakage
RST =0V
40
μA
Reset time delay
TRSTDLY
Time between end of reset and begin-
ning of normal operation
——
100
ms
Reset assertion time
TRST
RST low time to generate system
reset
15
μs
VEE monitor accuracy
VEEMON
Measured VEE relative to actual VEE
for VEE (–44 to –57 V)
–4
4
%
VEE UVLO threshold
VUVLO
Point at which VEE UVLO is
declared.
VEE going negative
VEE going positive
–38
–36
–33
–31
V
*Note: If VDD ramp time is slower than 1 ms, hold the reset pins low until VDD is above 3.0 V to insure proper reset
operation.


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