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| LTC3788 Datasheet, PDF (5/32 Pages) Linear Technology – 2-Phase, Dual Output Synchronous Boost Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3788
Efï¬ciency and Power Loss
vs Output Current
100
10000
90
80
1000
70
60
100
50
40
10
30
20
10
0
0.01
VIN = 12V
1
VOUT = 24V
FIGURE 9 CIRCUIT
0.1
0.1
1
10
OUTPUT CURRENT (A)
BURST EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
CCM EFFICIENCY
3788 G01
BURST LOSS
PULSE-SKIPPING
LOSS
CCM LOSS
Efï¬ciency vs Input Voltage
100
ILOAD = 2A
99 FIGURE 9 CIRCUIT
98
97 VOUT = 12V
96
VOUT = 24V
95
94
93
92
91
90
0
5
10
15
20
INPUT VOLTAGE (V)
25
3788 G03
Load Step
Burst Mode Operation
Efï¬ciency and Power Loss
vs Output Current
100
10000
90
80
1000
70
60
100
50
40
10
30
20
10
0
0.00001 0.0001 0.001
VIN = 12V
1
VOUT = 24V
Burst Mode OPERATION
FIGURE 9 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
BURST EFFICIENCY
BURST LOSS
3788 G02
Load Step
Forced Continuous Mode
LOAD STEP
2A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
VIN = 12V
200μs/DIV
VOUT = 24V
FIGURE 9 CIRCUIT
Load Step
Pulse-Skipping Mode
3788 G04
LOAD STEP
2A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
LOAD STEP
2A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
VIN = 12V
200μs/DIV
VOUT = 24V
FIGURE 9 CIRCUIT
3788 G05
VIN = 12V
200μs/DIV
VOUT = 24V
FIGURE 9 CIRCUIT
3788 G06
3788f
5
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