LT3481 查看數據表（PDF） - Linear Technology
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LT3481 Datasheet PDF : 24 Pages
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LT3481
TYPICAL PERFORMANCE CHARACTERISTICS
Error Amp Output Current
100
80
60
40
20
0
–20
–40
–60
–80
1.065
1.165 1?.265 1.365
FB PIN VOLTAGE (V)
1.465
3481 G19
Minimum Input Voltage
4.5
4.0
3.5
3.0
VOUT = 3.3V
2.5 TA = 25 °C
L = 4.7μ
f = 800kHz
2.0
0.001 0.01
0.1
1
LOAD CURRENT (A)
10
3481 G20
Minimum Input Voltage
6.5
6.0
5.5
5.0
VOUT = 5.0V
4.5 TA = 25 °C
L = 4.7μ
f = 800kHz
4.0
0.001 0.01
0.1
1
LOAD CURRENT (A)
10
3481 G21
VC Voltages
2.50
2.00
CURRENT LIMIT CLAMP
1.50
1.00
SWITCHING THRESHOLD
0.50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3481 G22
Power Good Threshold
1.200
1.180
1.160
1.140
Switching Waveforms;
Burst Mode
IL
0.5A/DIV
VIN = 12V; FRONT PAGE APPLICATION
ILOAD = 10mA
VSW
5V/DIV
1.120
PG RISING
VOUT
10mV/DIV
1.100
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3481 G23
5μs/DIV
3481 G24
Switching Waveforms; Transition
from Burst Mode to Full
Frequency
Switching Waveforms; Full
Frequency Continuous Operation
IL
0.5A/DIV
IL
0.5A/DIV
VRUN/SS
5V/DIV
VRUN/SS
5V/DIV
VOUT
10mV/DIV
VIN = 12V; FRONT PAGE APPLICATION
ILOAD = 140mA
1μs/DIV
3481 G25
6
VOUT
10mV/DIV
VIN = 12V; FRONT PAGE APPLICATION
ILOAD = 1A
1μs/DIV
3481 G26
3481fb
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