LT1371 データシートの表示（PDF） - Linear Technology
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LT1371 Datasheet PDF : 16 Pages
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LT1371
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
1.0
150°C
0.9
100°C
25°C
0.8
0.7
0.6
0.5
–55°C
0.4
0.3
0.2
0.1
0
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
SWITCH CURRENT (A)
LT1371 • G01
Shutdown Delay and Threshold
vs Temperature
20
2.0
18
1.8
16
SHUTDOWN THRESHOLD
1.6
14
1.4
12
1.2
10
1.0
8 SHUTDOWN DELAY
0.8
6
0.6
4
0.4
2
0.2
0
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1371 • G04
S/S or SHDN Pin Input Current
vs Voltage
5
VIN = 5V
4
3
2
1
0
–1
–2
–3
–4
–5
–1 0 1 2 3 4 5 6 7 8 9
VOLTAGE (V)
LT1371 • G07
Switch Current Limit
vs Duty Cycle
6
Minimum Input Voltage
vs Temperature
3.0
5
2.8
25°C AND
4
125°C
2.6
–55°C
3
2.4
2
2.2
1
2.0
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
LT1371 • G02
Minimum Synchronization
Voltage vs Temperature
3.0
fSYNC = 700kHz
2.5
2.0
1.5
1.0
0.5
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1371 • G05
Switching Frequency
vs Feedback Pin Voltage
110
100
90
80
70
60
50
40
30
20
10
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FEEDBACK PIN VOLTAGE (V)
LT1371 • G08
1.8
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1371 • G03
Error Amplifier Output Current
vs Feedback Pin Voltage
400
300
25°C
200
125°C
–55°C
100
0
–100
–200
–300
–0.3 –0.2 –0.1 VREF 0.1
FEEDBACK PIN VOLTAGE (V)
LT1371 • G06
Error Amplifier Transconductance
vs Temperature
2000
1800
1600
gm
=
∆I (VC)
∆V (FB)
1400
1200
1000
800
600
400
200
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1371 • G09
4
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