Техническая Спецификация для Linear Technology DC1814A-D LTC4274A-4: LTPoE++ (90W) PSE (req. DC2093) DC1814A-D DC1814A-D
Модели
DC1814A-D
LTC4274A/LTC4274C
3
4274acfc
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
EE
Main PoE Supply Voltage
AGND
– V
EE
For IEEE Type 1 Compliant Output
For IEEE Type 2 Compliant Output
For LTPoE++ Compliant Output
For IEEE Type 2 Compliant Output
For LTPoE++ Compliant Output
l
l
l
45
51
51
54.75
57
57
57
57
57
V
V
V
V
V
Undervoltage Lockout
AGND
– V
EE
l
20
25
30
V
V
DD
V
DD
Supply Voltage
V
DD
– DGND
l
3.0
3.3
4.3
V
Undervoltage Lockout
l
2.2
V
Allowable Digital Ground Offset
DGND
– V
EE
l
25
57
V
I
EE
V
EE
Supply Current
(AGND
– V
EE
) = 55V
l
–2.4
–5
mA
I
DD
V
DD
Supply Current
(V
DD
– DGND) = 3.3V
l
1.1
3
mA
Detection
Detection Current – Force Current
First Point, AGND
– V
OUT
= 9V
Second Point, AGND
– V
OUT
= 3.5V
l
l
220
140
140
240
160
160
260
180
180
μA
μA
μA
Detection Voltage – Force Voltage
AGND
– V
OUT
, 5μA ≤ I
OUT
≤ 500μA
First
Point
Second
Point
l
l
7
3
3
8
4
4
9
5
5
V
V
V
Detection Current Compliance
AGND
– V
OUT
= 0V
l
0.8
0.9
mA
V
OC
Detection Voltage Compliance
AGND
– V
OUT
, Open Port
l
10.4
12
V
Detection Voltage Slew Rate
AGND
– V
OUT
, C
PORT
= 0.15μF
l
0.01
V/μs
Minimum Valid Signature Resistance
l
15.5
17
18.5
kΩ
Maximum Valid Signature Resistance
l
27.5
29.7
32
kΩ
Classification
V
CLASS
Classification Voltage
AGND
– V
OUT
, 0mA ≤ I
CLASS
≤ 50mA
l
16.0
20.5
V
Classification Current Compliance
V
OUT
= AGND
l
53
61
67
mA
Classification Threshold Current
Class 0 – 1
Class 1 – 2
Class 2 – 3
Class 3 – 4
Class 4 – Overcurrent
Class 1 – 2
Class 2 – 3
Class 3 – 4
Class 4 – Overcurrent
l
l
l
l
l
5.5
13.5
21.5
31.5
45.2
21.5
31.5
45.2
6.5
14.5
23
33
48
33
48
7.5
15.5
24.5
34.9
50.8
24.5
34.9
50.8
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
MARK
Classification Mark State Voltage
AGND
– V
OUT
, 0.1mA ≤ I
CLASS
≤ 10mA
l
7.5
9
10
V
Mark State Current Compliance
V
OUT
= AGND
l
53
61
67
mA
Gate Driver
GATE Pin Pull-Down Current
Port Off, V
GATE
= V
EE
+ 5V
Port Off, V
GATE
= V
EE
+ 1V
l
l
0.4
0.08
0.12
mA
mA
mA
GATE Pin Fast Pull-Down Current
V
GATE
= V
EE
+ 5V
30
mA
GATE Pin On Voltage
V
GATE
– V
EE
, I
GATE
= 1μA
l
8
12
14
V
Output Voltage Sense
V
PG
Power Good Threshold Voltage
V
OUT
– V
EE
l
2
2.4
2.8
V
OUT Pin Pull-Up Resistance to AGND
0V ≤ (AGND
– V
OUT
) ≤ 5V
l
300
500
700
kΩ
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. AGND – V
EE
= 54V, AGND = DGND, and V
DD
– DGND = 3.3V
unless otherwise noted. (Notes 3, 4)