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Rainbow-electronics MAX5953D Manual de usuario Pagina 7

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MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
_______________________________________________________________________________________ 7
DETECTION CURRENT
vs. INPUT VOLTAGE
MAX5953A/B/C/D toc01
INPUT VOLTAGE (V)
DETECTION CURRENT (mA)
8642
0.1
0.2
0.3
0.4
0.5
0
010
R
DISC
= 25.5k
Ω
I
IN
+ I
RDISC
CLASSIFICATION CURRENT
vs. INPUT VOLTAGE
MAX5953A/B/C/D toc02
INPUT VOLTAGE (V)
CLASSIFICATION CURRENT (mA)
252015105
5
10
15
20
25
30
35
40
45
50
0
030
CLASS 4
CLASS 3
CLASS 2
CLASS 1
CLASS 0
EFFECTIVE DIFFERENTIAL INPUT
RESISTANCE vs. INPUT CURRENT
MAX5953A/B/C/D toc03
INPUT VOLTAGE (V)
EFFECTIVE DIFFERENTIAL INPUT RESISTANCE (MΩ)
8642
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
010
INPUT OFFSET CURRENT
vs. INPUT VOLTAGE
MAX5953A/B/C/D toc04
INPUT VOLTAGE (V)
INPUT OFFSET CURRENT (µA)
862 4
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
-4.0
010
NORMALIZED UVLO
vs. TEMPERATURE
MAX5953A/B/C/D toc05
TEMPERATURE (
°
C)
NORMALIZED UVLO
100755025
0.992
0.994
0.996
0.998
1.000
1.002
1.004
1.006
1.008
1.010
0.990
0125
PGOOD OUTPUT LOW VOLTAGE
vs. CURRENT
MAX5953A/B/C/D toc06
I
SINK
(mA)
V
PGOOD
(mV)
15105
50
100
150
200
250
0
020
OUT LEAKAGE CURRENT
vs. TEMPERATURE
MAX5953A/B/C/D toc07
TEMPERATURE (°C)
OUT LEAKAGE CURRENT (nA)
100755025
1
10
100
1000
0.1
0125
V
OUT
= 48V
INRUSH CURRENT CONTROL
(V
IN
= 48V)
MAX5953A/B/C/D toc08
4ms/div
V
OUT
TO
V
EE
50V/div
V
GATE
5V/div
0V
0V
0A
0V
I
INRUSH
100mA/div
PGOOD
50V/div
DCUVLO THRESHOLD
vs. TEMPERATURE
MAX5953A/B/C/D toc09
TEMPERATURE (°C)
V
DCUVLO
(V)
100755025
1.2750
1.2775
1.2800
1.2825
1.2725
0 125
DCUVLO RISING
Typical Operating Characteristics
(V
IN
= (V+ - V
EE
) = 48V, GATE = PGOOD = unconnected, GND connected to OUT, HVIN connected to V+, UVLO = V
EE
, C
INBIAS
= 1µF,
C
REGOUT
= 2.2µF, R
RTCT
= 25kΩ, C
RTCT
= 100pF, C
BST
= 0.22µF, T
J
= 0°C to +125°C, unless otherwise noted. Typical values are
at T
J
= +25°C. All voltages are referenced to V
EE
, unless otherwise noted.)
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