DP83848C-POE-EK National Semiconductor, DP83848C-POE-EK Datasheet - Page 81

• Manufacturer Part Number: DP83848C-POE-EK
• Description: BOARD EVALUATION DP83848C
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of DP83848C-POE-EK

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Outputs And Type: 1, Isolated
• Power - Output: 24W
• Voltage - Output: 3.3V
• Current - Output: 7.3A
• Voltage - Input: 39 ~ 57V
• Regulator Topology: Flyback
• Frequency - Switching: 250kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM5072
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

8.2.28 Isolation Timing
8.2.29 25 MHz_OUT Timing
Note: 25 MHz_OUT characteristics are dependent upon the X1 input characteristics.
T2.29.1
T2.29.2
T2.28.1
T2.28.2
Parameter
Parameter
Clear bit 10 of BMCR
(return to normal operation
from Isolate mode)
(with PHYAD = 00000)
25 MHz_OUT
H/W or S/W Reset
25 MHz_OUT High/Low Time
25 MHz_OUT propagation delay
From software clear of bit 10 in
the BMCR register to the transi-
tion from Isolate to Normal Mode
From Deassertion of S/W or H/W
Reset to transition from Isolate to
Normal mode
X1
MODE
Description
Description
T2.29.1
T2.29.2
81
MII mode
RMII mode
Relative to X1
Notes
T2.28.2
T2.28.1
Notes
T2.29.1
ISOLATE
Min
Min
NORMAL
Typ
Typ
20
10
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Max
100
500
Max
8
Units
Units
ns
ns
ns
s
s