Typical Performance Characteristics - Linear Technology LT3480 Manual

LT3480

TYPICAL PERFORMANCE CHARACTERISTICS

Effi ciency
100
V = 12V
IN
90
V
IN
80
V = 24V
IN
70
60
L: NEC PLC-0745-5R6
V = 5V
f: 800kHz
OUT
50
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
No Load Supply Current
120
100
80
60
40
20
0
0 5 10 15 20
INPUT VOLTAGE (V)
Maximum Load Current
3.5
TYPICAL
3.0
2.5
MINIMUM
2.0
1.5
1.0
5 10 15 20
INPUT VOLTAGE (V)
4
Effi ciency
90
85
80
= 34V
75
70
65
60
55
V = 3.3V
OUT
50
0 0.2 0.4 0.6 0.8
3480 G01
No Load Supply Current
400
V = 3.3V
OUT CATCH DIODE: DIODES, INC. PDS360
350
V = 12V
IN
V
300 OUT
250
200
150
100
50
0
25 30 35
–50 –25
3480 G04
Switch Current Limit
4.0
3.5
3.0
2.5
2.0
V = 5V
OUT
T = 25 °C
A
1.5
L = 4.7μH
f = 800kHz
1.0
25 30 0
3480 G07
V = 7V
IN
V = 12V
IN
V = 34V
IN
V = 24V
IN
L: NEC PLC-0745-5R6
f: 800kHz
1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
3480 G02
= 3.3V
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
0 25 50 75 100 125 150
TEMPERATURE (°C)
3480 G05
20 60 80 100
40
DUTY CYCLE (%)
3480 G08
Effi ciency
90
80
70
60
50
V
IN
V
OUT
40
L = 5.6μH
F = 800 kHz
30
0 0.5 1.0 1.5
LOAD CURRENT (A)
Maximum Load Current
4.0
3.5
TYPICAL
3.0
2.5
MINIMUM
2.0
1.5
1.0
5 10 15 20
INPUT VOLTAGE (V)
Switch Current Limit
4.5
4.0
DUTY CYCLE = 10 %
3.5
3.0
DUTY CYCLE = 90 %
2.5
2.0
1.5
1.0
0.5
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
10
1
0.1
= 12V
= 3.3V
0.01
2
3480 G27
V = 3.3V
OUT
T = 25 °C
A
L = 4.7μH
f = 800 kHz
25 30
3480 G06
100 125 150
3480 G09
3480fb