LT3757(RevB) Просмотр технического описания (PDF) - Linear Technology
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LT3757 Datasheet PDF : 36 Pages
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LT3757
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
INTVCC vs Temperature
7.4
7.3
7.2
7.1
7.0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3757 G13
INTVCC Minimum Output Current
vs VIN
90
TJ = 150°C
80
70
60
50
INTVCC = 6V
40
INTVCC = 4.5V
30
20
10
0
0 5 10 15 20 25 30 35 40
VIN (V)
3757 G14
INTVCC Load Regulation
7.3
VIN = 8V
7.2
7.1
7
6.9
6.8
0 10 20 30 40 50 60 70
INTVCC LOAD (mA)
3757 G15
INTVCC Line Regulation
7.30
7.25
7.20
7.15
7.10
0
5 10 15 20 25 30 35 40
VIN (V)
3757 G16
INTVCC Dropout Voltage
vs Current, Temperature
700 VIN = 6V
600
125°C
500
150°C
75°C
400
25°C
300
0°C
200
–55°C
100
0
0
5
10
15
20
INTVCC LOAD (mA)
3757 G17
Gate Drive Rise
and Fall Time vs CL
90
INTVCC = 7.2V
80
70
60
RISE TIME
FALL TIME
50
40
30
20
10
0
0
5 10 15 20 25 30
CL (nF)
3757 G18
Gate Drive Rise
and Fall Time vs INTVCC
30
CL = 3300pF
25
RISE TIME
20
FALL TIME
15
10
5
0
3
6
9
12
INTVCC (V)
Typical Start-Up Waveforms
VIN = 12V
VOUT
5V/DIV
IL1A + IL1B
5A/DIV
15
3757 G19
2ms/DIV
PAGE 31 CIRCUIT
3757 G20
FBX Frequency Foldback
Waveforms During Overcurrent
VOUT
10V/DIV
VIN = 12V
VSW
20V/DIV
IL1A + IL1B
5A/DIV
50µs/DIV
PAGE 31 CIRCUIT
3757 G21
3757fb
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