MAX5940A-MAX5940B Ver la hoja de datos (PDF) - Maxim Integrated
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componentes Descripción
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MAX5940A-MAX5940B Datasheet PDF : 15 Pages
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IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
IIN
IINi + 1
IINi
dRi
≅
(VINi
(IINi
+
+
1
1
-
-
VINi)
IINi)
=
(IINi
1V
+1
-
IINi)
IOFFSET
≅
IINi
-
VINi
dRi
dRi
IOFFSET
VINi 1V VINi + 1
VIN
Figure1 . Effective Differential Input Resistance/Offset Current
Typical Operating Characteristics
(VIN = (GND - VEE) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = VEE (MAX5940B), TA = -40°C to +85°C. Typical values
are at TA = +25°C. All voltages are referenced to VEE, unless otherwise noted.)
EFFECTIVE DIFFERENTIAL INPUT
DETECTION CURRENT vs. INPUT VOLTAGE
CLASSIFICATION CURRENT vs. INPUT VOLTAGE
RESISTANCE vs. INPUT VOLTAGE
0.5
50
3.5
RDISC = 25.5kΩ
3.0
0.4
40
CLASS 4
2.5
0.3
IIN + IRDISC
30
CLASS 3
2.0
0.2
20
CLASS 2
1.5
0.1
0
0
2
4
6
8
10
INPUT VOLTAGE (V)
10
0
0
CLASS 1
CLASS 0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1.0
0.5
0
0
2
4
6
8 10 12
INPUT VOLTAGE (V)
INPUT OFFSET CURRENT
vs. INPUT VOLTAGE
0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
1
3
5
7
9
11
INPUT VOLTAGE (V)
NORMALIZED UVLO
vs. TEMPERATURE
1.010
1.008 UVLO = VEE
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
-40 -15
10
35
60
85
TEMPERATURE (°C)
PGOOD OUTPUT LOW VOLTAGE
vs. CURRENT
250
200
150
100
50
0
0
5
10
15
20
ISINK (mA)
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