LTC1155 查看數據表（PDF） - Linear Technology
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LTC1155 Datasheet PDF : 16 Pages
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LTC1155
TYPICAL PERFOR A CE CHARACTERISTICS
Turn ON Time
1000
900 CGATE = 1000pF
800
700
600
500
400
VGS = 5V
300
200
VGS = 2V
100
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
1155 G07
Standby Supply Current
50
45
40
35
30
25
20
VS = 18V
15
10
5 VS = 5V
0
–50 – 25
0 25 50 75 100 125
TEMPERATURE (°C)
1155 G10
Turn OFF Time
50
45
CGATE = 100pF
TIME FOR VGATE < 1V
40
35
30
25
20
15
10
5
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
1155 G08
Supply Current Per Side (ON)
1000
900
800
700
600
500
400
300
200 VS = 5V
100
VS = 12V
0
– 50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1155 G11
Short-Circuit Turn OFF Delay Time
50
45
CGATE = 1000pF
TIME FOR VGATE < 1V
40
35
30
25
20
VSEN = VS –1V
NO EXTERNAL DELAY
15
10
5
0
0
5
10
15
20
SUPPLY VOLTAGE (V)
1155 G09
Input ON Threshold
2.4
2.2
2.0
1.8
1.6
1.4
VS = 5V
1.2
1.0
VS = 18V
0.8
0.6
0.4
–50 – 25
0 25 50 75 100 125
TEMPERATURE (°C)
1155 G12
PIN FUNCTIONS
Input Pin
The LTC1155 logic input is a high impedance CMOS gate
and should be grounded when not in use. These input pins
have ESD protection diodes to ground and supply and,
therefore, should not be forced beyond the power supply
rails.
Gate Drive Pin
The gate drive pin is either driven to ground when the
switch is turned OFF or driven above the supply rail when
the switch is turned ON. This pin is a relatively high
impedance when driven above the rail (the equivalent of a
few hundred kΩ). Care should be taken to minimize any
loading of this pin by parasitic resistance to ground or
supply.
Supply Pin
The supply pin of the LTC1155 serves two vital purposes.
The first is obvious: it powers the input, gate drive,
regulation and protection circuitry. The second purpose is
less obvious: it provides a Kelvin connection to the top of
the two drain sense resistors for the internal 100mV
reference. The supply pin should be connected directly to
the power supply source as close as possible to the top of
the two sense resistors.
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