LT1640 Просмотр технического описания (PDF) - Linear Technology
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LT1640 Datasheet PDF : 12 Pages
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LT1640L/LT1640H
TYPICAL PERFOR A CE CHARACTERISTICS
Gate Voltage vs Temperature
15.0
14.5
14.0
13.5
13.0
12.5
12.0
– 50 – 25 0 25 50
TEMPERATURE (°C)
75 100
1640 G04
Gate Pull-Down Current
vs Temperature
55
52
49
46
43
40
– 50 – 25 0
25 50 75 100
TEMPERATURE (°C)
1640 G07
Circuit Breaker Trip Voltage
vs Temperature
55
54
53
52
51
50
49
48
– 50 – 25
0 25 50
TEMPERATURE (°C)
75 100
1640 G05
PWRGD Output Low Voltage
vs Temperature (LT1640L)
0.5
0.4
0.3
0.2
0.1
0
– 50 – 25 0 25 50 75 100
TEMPERATURE (°C)
1640 G08
Gate Pull-Up Current
vs Temperature
48
47
46
45
44
43
42
41
40
– 50
– 25 0 25 50
TEMPERATURE (°C)
75 100
1640 G06
PWRGD Output Impedance
vs Temperature (LT1640H)
8
7
6
5
4
3
2
– 50 – 25 0 25 50
TEMPERATURE (°C)
75 100
1640 G09
PIN FUNCTIONS
PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin
will toggle when VDRAIN is within VPG of VEE. This pin can
be connected directly to the enable pin of a power module.
When the DRAIN pin of the LT1640L is above VEE by more
than VPG, the PWRGD pin will be high impedance, allowing
the pull-up current of the module’s enable pin to pull the
pin high and turn the module off. When VDRAIN drops
below VPG, the PWRGD pin sinks current to VEE, pulling
the enable pin low and turning on the module.
When the DRAIN pin of the LT1640H is above VEE by more
than VPG, the PWRGD pin will sink current to the DRAIN
pin which pulls the module’s enable pin low, forcing it off.
When VDRAIN drops below VPG, the PWRGD sink current
is turned off and a 5k resistor is connected between
PWRGD and DRAIN, allowing the module’s pull-up cur-
rent to pull the enable pin high and turn on the module.
OV (Pin 2): Analog Overvoltage Input. When OV is pulled
above the 1.223V low to high threshold, an overvoltage
condition is detected and the GATE pin will be immediately
pulled low. The GATE pin will remain low until OV drops
below the 1.203V high to low threshold.
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