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ORing MOSFET Controller with
Ultra-Fast 200ns Turn-Off
Typical Operating Characteristics (continued)
(T A = +25°C, unless otherwise noted. See the Typical Operating Circuit.)
100
90
80
70
60
50
40
30
20
SLOW-COMPARATOR BLANKING TIME
t STH vs. C STH (R STH = 180k ? )
75mV OVERDRIVE
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
FAST-COMPARATOR REVERSE VOLTAGE
THRESHOLD (V FTH vs. R FTH )
T A = +85 ° C
T A = +125 ° C
T A = -40 ° C
80
72
64
56
48
40
32
24
16
FAST-COMPARATOR RESPONSE TIME
V IN = 1V, V AUXIN = 5V
V IN = 5V, V AUXIN = 0V
V IN = 12V,
V AUXIN = 0V
V IN = 2.75V,
V AUXIN = 12V
10
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0.2
0.1
0
0
20
40
60
80
100
120
140
8
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
C STH ( μ F)
CHARGE-PUMP FREQUENCY
R FTH (k ? )
TEMPERATURE ( ° C)
FAULT CURRENT WAVEFORM
80
78
76
74
72
vs. INPUT VOLTAGE
T A = +125 ° C
T A = +85 ° C
6.0
5.5
5.0
4.5
4.0
3.5
GATE-CHARGE CURRENT vs. C EXT
V IN = 12V
(IN SHORTED TO PGND)
MAX5079 toc09
MOSFET REVERSE
CURRENT
5A/div
BUS
5V/div
70
3.0
68
66
64
62
T A = +25 ° C
T A = -40 ° C
2.5
2.0
1.5
1.0
0.5
GATE
10V/div
IN
5V/div
60
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
V IN (V)
0
1
10
C EXT (nF)
100
400ns/div
V IN = 5V, V BUS = 5V,
V AUXIN = 0V, C STH = 0,
R STH = OPEN, R FTH = 0,
UVLO = IN
_______________________________________________________________________________________
5
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