B340A 查看數據表（PDF） - Linear Technology
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B340A Datasheet PDF : 24 Pages
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LT3975
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Thermal Derating
3.0 VIN = 12V
VOUT = 5V
2.5
I-GRADE
2.0
H-GRADE
1.5
LIMITED BY MAXIMUM
1.0
JUNCTION TEMPERATURE
θJA = 40°C/W
0.5
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3975 G10
Current Limit Foldback
6
30% DUTY CYCLE
VSS = 3V
5
4
3
2
1
0
0 0.2 0.4 0.6 0.8 1.0 1.2
FB PIN VOLTAGE (V)
3975 G13
BOOST Pin Current
50
45
40
35
30
25
20
15
10
5
0
0 0.5 1 1.5 2 2.5 3
SWITCH CURRENT (A)
3975 G16
Switch Current Limit
7
6
5
4
3
2
1
0
0
0.2
0.4
0.6
0.8
1
DUTY CYCLE
3975 G11
Soft-Start
6
30% DUTY CYCLE
5
4
VFB = 1V
VFB = 0V
3
2
1
0
0
0.5
1
1.5
2
2.5
SS PIN VOLTAGE (V)
3975 G14
Minimum On-Time
180
170
VSYNC = 0V
fSW = 2MHz
160
150
140
130
120
LOAD = 1A
110
100
90
LOAD = 2.5A
80
70
60
–55 –25
5 35 65 95 125 155
TEMPERATURE (°C)
3975 G17
Switch Current Limit
7.0
30% DUTY CYCLE
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G12
Switch VCESAT
250
200
150
100
50
0
0 0.5 1 1.5 2.0 2.5 3.0
SWITCH CURRENT (A)
3975 G15
Minimum Off-Time
200
190
VSYNC = 0V
fSW = 2MHz
180
170
160
150
LOAD = 2.5A
140
LOAD = 1A
130
120
110
100
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G18
3975f
5
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