B340A 데이터 시트보기 (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.
Switching Frequency
780
720
660
600
540
480
420
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G19
Internal Undervoltage Lockout
(UVLO)
6
5
4
3
2
1
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G22
Minimum Input Voltage,
VOUT = 5V
6.5
VOUT = 5V
fSW = 800kHz
6.0
TO RUN/TO START
5.5
5.0
4.5
4.0
0
0.5
1
1.5
2
2.5
LOAD CURRENT (A)
3975 G25
6
RT Programmed Switching
Frequency
350
300
250
200
150
100
50
0
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
SWITCHING FREQUENCY (MHz)
3975 G20
EN Thresholds
1.09
EN RISING
1.08
1.07
1.06
1.05
1.04
1.03
EN FALLING
1.02
1.01
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G23
Minimum Input Voltage,
VOUT = 3.3V
5.0
VOUT = 3.3V
FRONT PAGE APPLICATION
4.5
TO RUN/TO START
4.0
3.5
3.0
2.5
0
0.5
1
1.5
2
2.5
LOAD CURRENT (A)
3975 G26
Frequency Foldback
700
600
500
400
300
200
100
0
0 0.2 0.4 0.6 0.8 1 1.2
FB PIN VOLTAGE (V)
3975 G21
PG Thresholds
1.12
1.11
1.10
1.09
FB RISING
1.08
1.07
FB FALLING
1.06
1.05
1.04
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3975 G24
Burst Frequency
900
800
VOUT = 5V
700
fSW = 800kHz
600
500
400
VOUT = 3.3V
fSW = 600kHz
300
200
100
0
0 20 40 60 80 100 120 140 160
LOAD CURRENT (mA)
3975 G27
3975f
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