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48.50
49.50
48.75
49.00
49.25
MaxDutyCycle-%
0 100 200 300 400 500 600
OscillatorFrequency-kHz
T =125 C
J
o
T =-40 C
J
o
T =25 C
J
o
3
0
4
2
1
5
6
Current- Am
T =25 C
J
o
T =-40 C
J
o
T =125 C
J
o
0
2 4
6
8
10
12
V -SupplyVoltage-V
DD
DuringPoEDetection
432
434
436
438
440
442
444
446
448
450
452
I -mA
RTN
-40 -20 0 20 40 60
80
100 120 140
T -JunctionTemperature- C
J
o
40
90
50
100
60
110
120
130
70
80
BlankingTime-ns
-40 -20 0 20 40 60
80
100 120 140
T -JunctionTemperature- C
J
o
BL =V
BIAS
BL =RTN
50
55
70
75
60
65
ResponseTime-ns
-40 -20 0 20 40 60
80
100 120 140
T -JunctionTemperature- C
J
o
0
500
100
600
200
700
300
400
OscillatorFrequency-kHz
0 100 200 300 400 500 600 700
15000/R -kHz
FREQ
17.5
30.0
20.0
22.5
25.0
27.5
PDDetectionResistance-kW
1 2
3
4
8
5
9
6 10
7
11
Voltage,V -V
PI
Includes24.9k andHD01BridgeW
R(V )=
PI
1
(I(V )-I(V )-1))
PI PI
802.3afLimits
802.3afLimits
0.6
0.7
1.0
0.8
1.1
0.9
1.2
1.3
1.4
1.5
1.6
Current-mA
-40 -20 0 20 40 60
80
100 120 140
T -JunctionTemperature- C
J
o
Operating
R =30k
(FREQ)
W
Operating
R =150k
(FREQ)
W
Quiescent
TPS23750
TPS23770
SLVS590B – JULY 2005 – REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
(V
DD
+ RTN + SENP) DETECTION
CURRENT PoE CURRENT LIMIT MAXIMUM DUTY CYCLE
vs vs vs
SUPPLY VOLTAGE JUNCTION TEMPERATURE OSCILLATOR FREQUENCY
Figure 21. Figure 22. Figure 23.
CONVERTER CURRENT LIMIT
RESPONSE TIME BLANKING TIME OSCILLATOR FREQUENCY
vs vs vs
JUNCTION TEMPERATURE JUNCTION TEMPERATURE 15000/R
FREQ
Figure 24. Figure 25. Figure 26.
PD DETECTION RESISTANCE OPERATING CURRENT ( I
VDD
)
vs vs
VOLTAGE, V
PI
JUNCTION TEMPERATURE
Figure 27. Figure 28.
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