Datasheet

6
LT1640L/LT1640H
1640lhfb
TEST CIRCUIT
PWRGD/PWRGD V
DD
V
+
5V
OV
V
DRAIN
48V
R
5k
DRAIN
LT1640L/LT1640H
UV GATE
V
EE
SENSE
V
SENSE
1640 F01
V
UV
V
OV
+
–
Figure 1. Test Circuit
2V
1V
1640 F02
t
PHLOV
1.223V
0V
OV
GATE
1V
1.203V
t
PLHOV
TIMING DIAGRAMS
WUW
Figure 2. OV to GATE Timing
2V
1V
1640 F03
t
PHLUV
1.223V
0V
UV
GATE
1V
1.243V
t
PLHUV
Figure 3. UV to GATE Timing
Figure 4. SENSE to GATE Timing
1V
1640 F04
t
PHLSENSE
50mV
SENSE
GATE
1.8V
1V
1640 F05
0V
V
PWRGD
– V
DRAIN
= 0V
DRAIN
PWRGD
1V
1.4V
1.8V
1V
t
PLHPG
V
EE
V
EE
DRAIN
PWRGD
1V
1.4V
t
PHLPG
t
PLHPG
t
PHLPG
Figure 5. DRAIN to PWRGD/PWRGD Timing