LT3508 查看數據表（PDF） - Linear Technology
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LT3508 Datasheet PDF : 24 Pages
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LT3508
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency, VOUT = 5V
95
TA = 25°C
f = 700kHz
90
VIN = 12V
VIN = 24V
85
80
VIN = 32V
75
70
65
0
0.5
1
LOAD CURRENT (A)
1.5
3508 G01
Feedback Voltage
0.810
0.805
0.800
0.795
0.790
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3508 G04
Switching Frequency vs RT
1000
TA = 25°C
100
10
1
0.1
1
FREQUENCY (MHz)
10
3508 G07
Efficiency, VOUT = 3.3V
90
TA = 25°C
f = 700kHz
85
VIN = 12V
80
VIN = 24V
75
VIN = 32V
70
65
60
0
0.5
1
LOAD CURRENT (A)
Switch Current Limit
vs Temperature
3.0
1.5
3508 G02
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3508 G05
Switching Frequency
vs Temperature
1.2
RT = 33.2k
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3508 G08
Efficiency, VOUT = 1.8V
85
TA = 25°C
f = 1MHz
80
VIN = 3.3V
75
VIN = 5V
70
VIN = 12V
65
60
55
0
0.5
1
LOAD CURRENT (A)
Switch Current Limit
vs Duty Cycle
3.0
TA = 25°C
2.5
TYPICAL
1.5
3508 G03
2.0
MINIMUM
1.5
1.0
0.5
0
0
20
40
60
80
100
DUTY CYCLE (%)
3508 G06
Switching Frequency Foldback
3.0
TA = 25°C
2.5
RT = 7.50k
2.0
1.5
1.0
RT = 33.2k
0.5
RT = 169k
0
0 100 200 300 400 500 600 700 800
FEEDBACK VOLTAGE (mV)
3508 G09
3508fb
4
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