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