LT1375 데이터 시트보기 (PDF) - Linear Technology
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LT1375 Datasheet PDF : 28 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LT1375/LT1376
Shutdown Pin Bias Current
500
CURRENT REQUIRED TO FORCE SHUTDOWN
400 (FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW µA
300
200
8
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
4
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1375/76 G04
Shutdown Supply Current
150
125
100
VIN = 25V
75
50
VIN = 10V
25
0
0
0.1
0.2
0.3
0.4
0.5
SHUTDOWN VOLTAGE (V)
1375/76 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)
1375/76 G10
Standby and Shutdown Thresholds
2.40
STANDBY
2.36
2.32
0.8
START-UP
0.4
SHUTDOWN
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1375/76 G05
Shutdown Supply Current
30
VSHUTDOWN = 0V
25
20
15
10
5
0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1375/76 G06
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)
1375/76 G02
1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
RLOAD = 50Ω
500
100
1k
10k
100k
FREQUENCY (Hz)
–50
1M 10M
1375/76 G03
Switching Frequency
600
550
500
450
400
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1375/76 G11
LT1376 Minimum Input Voltage
with 5V Output
8.5
MINIMUM INPUT VOLTAGE CAN BE
8.0 REDUCED BY ADDING A SMALL EXTERNAL
PNP. SEE APPLICATIONS INFORMATION
7.5
7.0
MINIMUM
VOLTAGE TO
6.5
START WITH
STANDARD
CIRCUIT
6.0
MINIMUM VOLTAGE
5.5
TO RUN WITH
STANDARD CIRCUIT
5.0
0
10
100
LOAD CURRENT (mA)
1000
1375/76 G12
5
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