Rainbow-electronics MAX5953D Manual do Utilizador Página 9

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MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
_______________________________________________________________________________________ 9
REGOUT UVLO VOLTAGE
vs. TEMPERATURE
MAX5953A/B/C/D toc19
TEMPERATURE (
°
C)
REGOUT UVLO VOLTAGE (V)
100755025
6.2
6.4
6.6
6.8
7.0
7.2
7.4
6.0
0125
RISING
FALLING
OPERATING FREQUENCY
vs. TEMPERATURE
MAX5953A/B/C/D toc20
TEMPERATURE (
°
C)
OPERATING FREQUENCY (kHz)
1007525 50
250
300
350
400
450
500
550
600
200
0125
R
RTCT
= 12k
C
RTCT
= 100pF
R
RTCT
= 24.3k
C
RTCT
= 100pF
SOFT-START CURRENT
vs. TEMPERATURE
MAX5953A/B/C/D toc21
TEMPERATURE (
°
C)
SOFT-START CURRENT (µA)
100755025
31.5
32.0
32.5
33.0
33.5
34.0
31.0
0125
MINIMUM RCFF AND OPTO LEVELS
vs. TEMPERATURE
MAX5953A/B/C/D toc22
TEMPERATURE (
°
C)
V
RCFF
(V), V
OPTO
(V)
100755025
1.25
1.50
1.75
2.00
2.25
2.50
2.75
1.00
0125
RCFF
OPTO
CURRENT-LIMIT COMPARATOR
THRESHOLD vs. TEMPERATURE
MAX5953A/B/C/D toc23
TEMPERATURE (
°
C)
V
REGOUT
(V)
100755025
0.151
0.152
0.153
0.154
0.155
0.156
0.157
0.158
0.159
0.160
0.150
0125
HVIN RISING
PPWM TO XFRMRL SKEW
vs. TEMPERATURE
MAX5953A/B/C/D toc24
TEMPERATURE (
°
C)
PPWM TO XFRMRL SKEW (ns)
100755025
91
92
93
94
95
96
97
98
99
100
90
0125
FLTINT CURRENT
vs. TEMPERATURE
MAX5953A/B/C/D toc25
TEMPERATURE (°C)
I
FLTINT
(µA)
100755025
76
77
78
79
80
81
82
83
84
85
75
0 125
FLTINT SHUTDOWN VOLTAGE
vs. TEMPERATURE
MAX5953A/B/C/D toc26
TEMPERATURE (°C)
V
FLTINT
(V)
100755025
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
1.9
0125
RISING
FALLING
POWER MOSFETS R
DS(ON)
vs. TEMPERATURE
MAX5953A/B/C/D toc27
TEMPERATURE (°C)
R
DS(ON)
()
100755025
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0
0125
Typical Operating Characteristics (continued)
(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
= 25k, 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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