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| LTC3784_15 Datasheet, PDF (5/38 Pages) Linear Technology – 60V PolyPhase Synchronous Boost Controller | |||
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LTC3784
Typical Performance Characteristics TA = 25°C unless otherwise noted.
Efficiency 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 10 CIRCUIT
0.1
0.1
1
10
OUTPUT CURRENT (A)
3784 G01
BURST EFFICIENCY
BURST LOSS
PULSE-SKIPPING
PULSE-SKIPPING
EFFICIENCY
LOSS
FORCED CONTINUOUS
FORCED CONTINUOUS
MODE EFFICIENCY
MODE LOSS
Efficiency 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 10 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
3784 G02
BURST EFFICIENCY
BURST LOSS
Efficiency vs Load Current
100
VIN = 12V
99 ILOAD = 2A
FIGURE 10 CIRCUIT
98
97
96
VOUT = 12V
95
VOUT = 24V
94
93
92
91
90
0
5
10
15
20
INPUT VOLTAGE (V)
25
3784 G03
Load Step
Forced Continuous Mode
Load Step
Burst Mode Operation
Load Step
Pulse-Skipping Mode
LOAD STEP
5A/DIV
LOAD STEP
5A/DIV
LOAD STEP
5A/DIV
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
VIN = 12V
200µs/DIV
VOUT = 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
3784 G04
Inductor Currents at Light Load
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
VIN = 12V
200µs/DIV
VOUT = 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
Soft Start-Up
INDUCTOR
CURRENT
5A/DIV
VOUT
500mV/DIV
3784 G05
VIN = 12V
200µs/DIV
VOUT = 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
3784 G06
Regulated Feedback Voltage
vs Temperature
1.212
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
5A/DIV
PULSE-
SKIPPING
MODE
VOUT
5V/DIV
0V
1.209
1.206
1.203
1.200
1.197
1.194
1.191
VIN = 12V
5µs/DIV
VOUT = 24V
ILOAD = 200µA
FIGURE 10 CIRCUIT
3784 G07
VIN = 12V
2ms/DIV
VOUT = 24V
FIGURE 10 CIRCUIT
3784 G08
For more information www.linear.com/LTC3784
1.188
â60 â35 â10 15 40 65 90
TEMPERATURE (°C)
115 140
3784 G09
3784fb
5
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