LT3481H Просмотр технического описания (PDF) - Linear Technology
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LT3481H Datasheet PDF : 24 Pages
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LT3481
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency (VOUT = 5.0V)
100
90
VIN = 12V
80
VIN = 24V
70
60
50
40
30
20
10
0
0.0001
L: NEC PLC-0745-4R7
f: 800kHz
0.001 0.01 0.1
1
10
LOAD CURRENT (A)
3481 G01
Efficiency (VOUT = 3.3V)
100
90
80
VIN = 7V
70
60
VIN = 24V
VIN = 12V
50
40
30
20
10
0
0.0001
L: NEC PLC-0745-4R7
f: 800kHz
0.001 0.01 0.1
1
10
LOAD CURRENT (A)
3481 G02
Efficiency
90
85
VIN = 12V
80
VIN = 24V
75
70
65
60
VOUT = 3.3V
55
L = 10μH
LOAD = 1A
50
0 0.5 1 1.5 2 2.5 3
SWITCHING FREQUENCY (MHz)
3481 G03
No Load Supply Current
80
70
TA = 25°C
60
50
40
30
20
10
FRONT PAGE APPLICATION
0
0 5 10 15 20 25
INPUT VOLTAGE (V)
30 35
3481 G04
No Load Supply Current
400
CATCH DIODE: DIODES, INC. PDS360
350
VIN = 12V
300 VOUT = 3.3V
250
200
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
150
HIGH TEMPERATURE
100
50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3481 G05
Maximum Load Current
4.0
3.5
TYPICAL
3.0
2.5
2.0
1.5
1.0
5
MINIMUM
VOUT = 3.3V
TA = 25 °C
L = 4.7μ
f = 800 kHz
10
15
20
25
30
INPUT VOLTAGE (V)
3481 G06
Maximum Load Current
4.0
3.5
TYPICAL
3.0
2.5
2.0
1.5
1.0
5
MINIMUM
VOUT = 5.0V
TA = 25 °C
L = 4.7μ
f = 800 kHz
10
15
20
25
30
INPUT VOLTAGE (V)
3481 G07
4
Switch Current Limit
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0
20
40
60
80
100
DUTY CYCLE (%)
3481 G08
Switch Current Limit
4.5
4.0
DUTY CYCLE = 10 %
3.0
2.5
DUTY CYCLE = 90 %
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3481 G09
3481fb
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