LTC3787
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency and Power Loss
vs Output Current
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
V
IN
= 12V
V
OUT
= 24V
FIGURE 10 CIRCUIT
0.1
1
OUTPUT CURRENT (A)
10
3787 G01
Efficiency and Power Loss
vs Output Current
10000
100
90
10000
1000
POWER LOSS (mW)
80
EFFICIENCY (%)
70
60
50
40
30
1000
POWER LOSS (mW)
100
100
10
10
1
0.1
V
IN
= 12V
1
V
OUT
= 24V
10
Burst Mode OPERATION
FIGURE 10 CIRCUIT
0
0.1
0.1
1
10
0.00001 0.0001 0.001 0.01
OUTPUT CURRENT (A)
20
3787 G02
BURST EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
FORCED CONTINUOUS
MODE EFFICIENCY
BURST LOSS
PULSE-SKIPPING
LOSS
FORCED CONTINUOUS
MODE LOSS
BURST EFFICIENCY
BURST LOSS
Efficiency vs Load Current
100
99
98
EFFICIENCY (%)
97
96
95
94
93
92
91
90
0
5
15
10
INPUT VOLTAGE (V)
20
25
3787 G03
Load Step
Forced Continuous Mode
LOAD STEP
5A/DIV
V
IN
= 12V
I
LOAD
= 2A
FIGURE 10 CIRCUIT
V
OUT
= 12V
V
OUT
= 24V
INDUCTOR
CURRENT
5A/DIV
V
OUT
500mV/DIV
200μs/DIV
V
IN
= 12V
V
OUT
= 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
3787
G04
Load Step
Burst Mode Operation
LOAD STEP
5A/DIV
INDUCTOR
CURRENT
5A/DIV
V
OUT
500mV/DIV
LOAD STEP
5A/DIV
Load Step
Pulse-Skipping Mode
INDUCTOR
CURRENT
5A/DIV
V
OUT
500mV/DIV
3787
G05
3787
G06
200μs/DIV
V
IN
= 12V
V
OUT
= 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
200μs/DIV
V
IN
= 12V
V
OUT
= 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
3787fc
5
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
