Rainbow Electronics MAX5953D - Manual (Page 9)

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)
100 75 50 25
6.2
6.4
6.6
6.8
7.0
7.2
7.4
6.0
0 125
RISING
FALLING
OPERATING FREQUENCY
vs. TEMPERATURE
MAX5953A/B/C/D toc20
TEMPERATURE ( °C)
OPERATING FREQUENCY (kHz)
100 75 25 50
250
300
350
400
450
500
550
600
200
0 125
R RTCT = 12k Ω
C RTCT = 100pF
R RTCT = 24.3k Ω
C RTCT = 100pF
SOFT-START CURRENT
vs. TEMPERATURE
MAX5953A/B/C/D toc21
TEMPERATURE ( °C)
SOFT-START CURRENT (
µ
A)
100 75 50 25
31.5
32.0
32.5
33.0
33.5
34.0
31.0
0 125
MINIMUM RCFF AND OPTO LEVELS
vs. TEMPERATURE
MAX5953A/B/C/D toc22
TEMPERATURE ( °C)
V
RCFF
(V), V
OPTO
(V)
100 75 50 25
1.25
1.50
1.75
2.00
2.25
2.50
2.75
1.00
0 125
RCFF
OPTO
CURRENT-LIMIT COMPARATOR
THRESHOLD vs. TEMPERATURE
MAX5953A/B/C/D toc23
TEMPERATURE ( °C)
V
REGOUT
(V)
100 75 50 25
0.151
0.152
0.153
0.154
0.155
0.156
0.157
0.158
0.159
0.160
0.150
0 125
HVIN RISING
PPWM TO XFRMRL SKEW
vs. TEMPERATURE
MAX5953A/B/C/D toc24
TEMPERATURE ( °C)
PPWM TO XFRMRL SKEW (ns)
100 75 50 25
91
92
93
94
95
96
97
98
99
100
90
0 125
FLTINT CURRENT
vs. TEMPERATURE
MAX5953A/B/C/D toc25
TEMPERATURE ( °C)
I FLTINT
(µ
A)
100 75 50 25
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)
100 75 50 25
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
1.9
0 125
RISING
FALLING
POWER MOSFETS R DS(ON)
vs. TEMPERATURE
MAX5953A/B/C/D toc27
TEMPERATURE ( °C)
R
DS(ON)
(Ω
)
100 75 50 25
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0
0 125
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 Ω, 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.)