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LTC4271 PDF预览

LTC4271

更新时间: 2023-12-20 18:44:10
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
32页 1522K
描述
PoE/PoE+/LTPoE++ PSE数字控制器

LTC4271 数据手册

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LTC4270/LTC4271  
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted.  
(Notes 3 & 4)  
SYMBOL PARAMETER  
XIO  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
l
l
l
l
V
V
XIO Digital Output Low  
V
V
V
V
– V , I = 5mA  
EE XIOn  
0.7  
V
V
OLX  
OHX  
XIOn  
XIOn  
XIOn  
XIOn  
XIO Digital Output High  
– V , I  
= 100µA  
3.5  
3.4  
EE XIOn  
XIO Digital Input Low Voltage  
XIO Digital Input High Voltage  
Internal Pull Up to CAP2  
– V  
– V  
0.8  
V
EE  
EE  
V
XIO0, XIO1  
50  
kΩ  
PSE Timing Characteristics  
t
t
t
t
t
t
Detection Time  
Beginning To End of Detection (Note 7)  
(Note 7)  
220  
12  
ms  
ms  
ms  
ms  
ms  
ms  
DET  
Class Event Duration  
Class Event Turn On Duration  
Mark Event Duration  
Last Mark Event Duration  
CLE  
l
C
= 0.6µF (Note 7)  
PORT  
0.1  
60  
CLEON  
ME  
(Note 7, Note 11)  
(Note 7, Note 11)  
8.6  
22  
l
l
16  
15  
MEL  
PON  
Power On Delay in AUTO Pin Mode From End of Valid Detect to Application of Power to Port  
(Note 7)  
l
Turn-On Rise Time  
(AGND – V ): 10% to 90% of (AGND - V ) C  
=
24  
µs  
OUT  
EE PORT  
0.15µF (Note 7)  
l
l
l
Turn-On Ramp Rate  
Turn-On Class Transition  
Fault Delay  
C
C
= 0.15µF (Note 7)  
= 0.15µF (Note 7)  
10  
V/µs  
ms  
s
PORT  
PORT  
t
t
0.1  
TOCL  
ED  
From I  
or I Fault to Next Detect  
1.0  
1.1  
CUT  
LIM  
(Note 7)  
l
l
l
Midspan Mode Detection Backoff  
Power Removal Detection Delay  
R
= 15.5kΩ (Note 7)  
2.3  
1.0  
52  
2.5  
1.3  
59  
2.7  
2.5  
66  
s
s
PORT  
From Power Removal After t to Next Detect (Note 7)  
DIS  
t
t
Maximum Current Limit Duration (Note 7)  
During Port Start-Up  
ms  
START  
CUT  
l
Maximum Overcurrent Duration  
After Port Start-Up  
(Note 7)  
52  
59  
66  
ms  
l
l
Maximum Overcurrent Duty Cycle (Note 7)  
5.8  
10  
6.3  
12  
6.7  
14  
%
t
Maximum Current Limit Duration  
t
= 1 (Note 7, Note 12)  
ms  
LIM  
LIM  
After Port Start-Up – t Enabled  
LIM  
l
l
l
Maximum Current Limit Duration  
t
= 0 (Note 7, Note 12)  
52  
1.6  
320  
59  
66  
3.6  
380  
ms  
ms  
ms  
LIM  
After Port Start-Up – t as t  
LIM  
CUT  
t
t
t
Maintain Power Signature (MPS)  
Pulse Width Sensitivity  
Current Pulse Width to Reset Disconnect Timer (Note 7,  
Note 8)  
MPS  
DIS  
Maintain Power Signature (MPS)  
Dropout Time  
(Note 7, Note 5)  
350  
2
Masked Shut Down Delay  
(Note 7)  
(Note 7)  
6.5  
3
µs  
s
MSD  
2
l
l
I C Watchdog Timer Duration  
1.5  
3
Minimum Pulse Width for Masked (Note 7)  
Shut Down  
µs  
l
Minimum Pulse Width for RESET (Note 7)  
4.5  
µs  
Rev E  
6
For more information www.analog.com  

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