LT1374CFE 데이터 시트보기 (PDF) - Linear Technology
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LT1374CFE Datasheet PDF : 32 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LT1374
Shutdown Supply Current
70
60
VIN = 25V
50
VIN = 10V
40
30
20
10
0
0
0.1
0.2
0.3
0.4
SHUTDOWN VOLTAGE (V)
1374 G07
Frequency Foldback
500
400
SWITCHING
FREQUENCY
300
200
100
0
0
FEEDBACK PIN
CURRENT
0.5 1.0 1.5 2.0 2.5
FEEDBACK PIN VOLTAGE (V)
1374 G10
Maximum Load Current
at VOUT = 10V
4.5
VOUT = 10V
L = 20µH
L = 10µH
4.0
L = 5µH
3.5
Error Amplifier Transconductance
2500
Error Amplifier Transconductance
3000
200
2000
PHASE
2500
150
1500
1000
2000
GAIN
( ) 1500 VFB 2 × 10–3
ROUT
200k
100
VC
COUT
12pF
50
500
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1374 G08
1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
RLOAD = 50Ω
500
100
1k
10k
100k
FREQUENCY (Hz)
–50
1M 10M
1374 G09
Switching Frequency
550
540
530
520
510
500
490
480
470
460
450
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1374 G11
Minimum Input Voltage
with 5V Output
6.4
6.2
MINIMUM
6.0
STARTING
VOLTAGE
5.8
5.6 MINIMUM
RUNNING
5.4 VOLTAGE
5.2
5.0
1
10
100
LOAD CURRENT (mA)
1000
1374 G12
Maximum Load Current
at VOUT = 3.3V
4.5
L = 20µH
L = 10µH
4.0
L = 5µH
Maximum Load Current
at VOUT = 5V
4.5
L = 20µH
L = 10µH
4.0
L = 5µH
3.5
3.5
3.0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G13
VOUT = 3.3V
3.0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G14
VOUT = 5V
3.0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G15
1374fd
5
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