IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
6 ______________________________________________________________________________________
  Typical Operating Characteristics (continued)
(V
IN
 = (V
DD
 - V
SS
) = 54V, R
DET
 = 24.9k? R
CLS
 = 615? and R
SL
 = 60.4k? RTN, WAD, PG, 2EC, WK, and ULP unconnected; all
voltages are referenced to V
SS.
)
INRUSH CONTROL WAVEFORM WITH
TYPE 2 CLASSIFICATION
MAX5981 toc10
0V
0V
0V
0A
0V
V
RTN
50V/div
I
RTN
100mA/div
V
DD
50V/div
V
PG
10V/div
V
2EC
40V/div
20ms/div
USING TYPICAL APPLICATION CIRCUIT
2EC PULLED UP TO V
DD
 WITH 10kI
INRUSH CONTROL WAVEFORM WITH
TYPE 2 CLASSIFICATION
MAX5981 toc11
V
PG
10V/div
0V
0V
0V
0A
0V
V
RTN
50V/div
I
RTN
200mA/div
V
DD
50V/div
20ms/div
V
2EC
40V/div
USING TYPICAL APPLICATION CIRCUIT
2EC PULLED UP TO V
DD
 WITH 10kI
LED CURRENT vs. R
SL
 
R
SL
 (kI)
60
55
50
45
40
35
30
25
20
15
10
5
13
16
19
22
25
10
0
65
-40NC < T
A
 < +85NC
LED CURRENT vs. LED VOLTAGE
4
3
2
1
10
15
20
25
5
0
5
V    (V)
R
SL
 = 60.4kI
R
SL
 = 30.2kI
NORMAL OPERATION CURRENT LIMIT
vs. RTN VOLTAGE
V
RTN
 (V)
50
40
10
20
30
200
300
400
500
600
700
800
900
100
0
60
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