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.
SS Pin Current
2.6
VSS = 0.5V
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G28
Dropout Comparator Thresholds
600
580
560
540
VOUT RISING
520
500
480
VOUT FALLING
460
440
420
400
–55 –25
5 35 65 95 125 155
TEMPERATURE (°C)
3975 G31
Burst Mode Switching Waveforms
Boost Capacitor Charger
160
VBST = VIN
140
120
100
80
60
40
20
0
0 2 4 6 8 10 12 14 16
OUT PIN VOLTAGE (V)
3975 G29
Start-Up/Dropout Performance
VIN
1V/DIV
VOUT
1V/DIV
VIN
VOUT
2.5Ω LOAD
100ms/DIV
(2A IN REGULATION)
3975 G32
Full Frequency Switching
Waveforms
Boost Diode Forward Voltage
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.5
1
1.5
2
BOOST DIODE CURRENT (A)
3975 G30
Start-Up/Dropout Performance
VIN
1V/DIV
VOUT
1V/DIV
VIN
VOUT
1kΩ LOAD
100ms/DIV
(5mA IN REGULATION)
3975 G33
Dropout Switching Waveforms
VSW
5V/DIV
IL
0.5A/DIV
VOUT
10mV/DIV
VIN = 12V
VOUT = 3.3V
ILOAD = 20mA
COUT = 47µF
5µs/DIV
3975 G34
VSW
5V/DIV
IL
1A/DIV
VOUT
20mV/DIV
VIN = 12V
VOUT = 3.3V
ILOAD = 1A
COUT = 47µF
1µs/DIV
3975 G35
VSW
2V/DIV
IL
1A/DIV
VOUT
50mV/DIV
VIN = 5V
VOUT SET FOR 5V
ILOAD = 0.5A
COUT = 47µF
5µs/DIV
3975 G36
3975f
7
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