LT3431 查看數據表（PDF） - Linear Technology
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LT3431 Datasheet PDF : 28 Pages
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LT3431
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Peak Current Limit
6
Tj = 25°C
5
TYPICAL
4
GUARANTEED MINIMUM
3
FB Pin Voltage and Current
1.234
2.0
1.229
1.224
1.219
1.214
1.209
1.5
VOLTAGE
1.0
CURRENT
0.5
2
1.204
0
0
20
40
60
80
100
–50 –25 0 25 50 75 100 125
DUTY CYCLE (%)
JUNCTION TEMPERATURE (°C)
3431 G01
3431 G02
Lockout and Shutdown
Thresholds
2.4
LOCKOUT
2.0
1.6
1.2
0.8
START-UP
0.4
SHUTDOWN
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3431 G04
Shutdown Supply Current
40
VSHDN = 0V
35
30
25
20
15
10
5
0
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
3431 G05
Error Amplifier Transconductance
Error Amplifier Transconductance
2500
3000
200
2000
PHASE
2500
150
1500
1000
2000
GAIN
( ) 1500 VFB 2 • 10–3
ROUT
200k
100
VC
COUT
12pF
50
500
1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3431 G07
RLOAD = 50Ω
500
100
1k
10k
100k
FREQUENCY (Hz)
–50
1M 10M
3431 G08
SHDN Pin Bias Current
250
CURRENT REQUIRED TO FORCE SHUTDOWN
200 (FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW µA
150
100
12
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
6
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3431 G03
Shutdown Supply Current
300
250
VIN = 60V
200
VIN = 15V
150
100
50
0
0
0.1
0.2
0.3
0.4
0.5
SHUTDOWN VOLTAGE (V)
3431 G06
Frequency Foldback
625
SWITCHING
FREQUENCY
500
375
250
125
0
0
FB PIN
CURRENT
0.2 0.4 0.6 0.8 1.0 1.2
VFB (V)
3431 G09
4
sn3431 3431fs
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