LT4250H LINER [Linear Technology], LT4250H Datasheet - Page 6

• Manufacturer Part Number: LT4250H
• Description: Negative 48V Hot Swap Controller
• Manufacturer: LINER [Linear Technology]

LT4250L/LT4250H
TIMING DIAGRAMS
6
SENSE
100mV
GATE
GATE
W U
OV
V
EE
V
DRAIN
PWRGD
PWRGD
DRAIN
V
2V
0V
UV
PWRGD
Figure 5a. DRAIN to PWRGD/PWRGD Timing
V
5V
+
V
– V
OV
Figure 4a. SENSE to GATE Timing
DRAIN
60mV
5k
Figure 2. OV to GATE Timing
R
1.255V
= 0V
Figure 1a. Test Circuit 1
1V
PWRGD/PWRGD V
OV
UV
V
t
t
PHLOV
PHLSENSE
EE
1V
LT4250L/LT4250H
W
DRAIN
SENSE
GATE
1.4V
1.4V
DD
t
PHLDL
1V
t
PHLDL
1V
1640 F01a
V
V
4250 F05a
1.235V
DRAIN
SENSE
+
–
V
V
V
EE
EE
EE
48V
t
PLHOV
1V
4250 F04a
4250 F02
V
GATE
GATE
UV
UV
UV
2V
0V
GATE
PWRGD
PWRGD
V
PWRGD
V
V
Figure 5b. GATE to PWRGD/PWRGD Timing
GATE
GATE
Figure 4b. Active Current Limit Timeout
– V
– V
– V
PWRGD/PWRGD V
OV
UV
V
EE
GATE
GATE
DRAIN
1.125V
LT4250L/LT4250H
Figure 3. UV to GATE Timing
GATE
Figure 1b. Test Circuit 2
= 0
= 0
= 0
1V
t
PHLUV
1V
1.4V
1.4V
DRAIN
SENSE
GATE
DD
t
PHLCB
t
t
PHLGH
PHLGH
1V
1V
+
–
48V
0.1 F
10k
10
+
–
4250 F05b
1.255V
1V
20V
V
EE
t
PLHUV
1V
IRF530
10
4250 F01b
4250 F04b
4250 F03
4250lhf