MAX5972A Datasheet, PDF (5/13 Pages) Maxim Integrated Products – IEEE 802.3af/at-Compliant, Powered Device Interface Controller with Integrated Power MOSFET

IEEE 802.3af/at-Compliant, Powered Device Interface
Controller with Integrated Power MOSFET
Typical Operating Characteristics (continued)
(VIN = (VDD - VSS) = 54V, RDET = 24.9kω, RCLS = 615ω, and RSL = 60.4kω. RTN, WAD, PG, and 2EC unconnected; all voltages are
referenced to VSS.)
2EC SINK CURRENT vs. 2EC VOLTAGE
2.0
TA = -40NC TA = +25NC
1.6
T_A = +85NC
1.2
PG SINK CURRENT vs. PG VOLTAGE
300
TA = -40NC ^TA ^{= +25NC}
250
TA = +85NC
200
0.8
150
0.4
0
0
150
VSS UNCONNECTED
V_2EC REFERENCED TO RTN
V_WAD = 14V
10 20 30 40 50 60
V2EC (V)
INRUSH CURRENT LIMIT
vs. RTN VOLTAGE
130
110
90
70
50
0
10 20 30 40 50 60
VRTN (V)
INRUSH CONTROL WAVEFORM WITH
TYPE 2 CLASSIFICATION
MAX5972A toc10
USING TYPICAL APPLICATION CIRCUIT
2EC PULLED UP TO VDD WITH 10kI
V2EC
50V/div
0V
V_RTN
50V/div
0V
I_RTN
100mA/div
0A
200µs/div
V_DD
50V/div
0V
100
50
0
10 20 30 40 50 60
VPG (V)
NORMAL OPERATION CURRENT LIMIT
vs. RTN VOLTAGE
900
800
700
600
500
400
300
200
100
0
10 20 30 40 50 60
VRTN (V)
ENTERING POWER MODE WITH
TYPE 2 CLASSIFICATION
MAX5972A toc11
USING TYPICAL APPLICATION CIRCUIT
2EC PULLED UP TO V_DD WITH 10kI
V_PG
0V 10V/div
V_2EC
0V 40V/div
V_RTN
0V 50V/div
I_RTN
0A 200mA/div
20ms/div
V_DD
0V 50V/div
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