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| LTC3839 Datasheet, PDF (5/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3839
Transient Response
(Forced Continuous Mode)
ILOAD
20A/DIV
VOUT
50mV/DIV
IL1
10A/DIV
IL2
10A/DIV
50μs/DIV
LOAD TRANSIENT = 0A TO 30A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT
Load Step
(Forced Continuous Mode)
ILOAD
20A/DIV
VOUT
50mV/DIV
3839 G01
IL1
10A/DIV
IL2
10A/DIV
5μs/DIV
LOAD STEP = 0A TO 30A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT
Load Release
(Forced Continuous Mode)
ILOAD
20A/DIV
VOUT
50mV/DIV
IL1
10A/DIV
IL2
10A/DIV
3839 G02
5μs/DIV
LOAD RELEASE = 30A TO 0A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT
3839 G03
Transient Response
(Discontinuous Mode)
Load Step
(Discontinuous Mode)
ILOAD
20A/DIV
VOUT
50mV/DIV
IL1
10A/DIV
IL2
10A/DIV
50μs/DIV
LOAD TRANSIENT = 750mA TO 30A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT
ILOAD
20A/DIV
3839 G04
VOUT
50mV/DIV
IL1
10A/DIV
IL2
10A/DIV
5μs/DIV
LOAD STEP = 750mA TO 30A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT
Load Release
(Discontinuous Mode)
ILOAD
20A/DIV
VOUT
50mV/DIV
IL1
10A/DIV
IL2
10A/DIV
3839 G05
5μs/DIV
LOAD RELEASE = 30A TO 750mA
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT
3839 G06
Load Release with Detect Transient (DTR)
Feature Enabled
SW1
5V/DIV
SW2
5V/DIV
ILOAD
20A/DIV
VOUT
20mV/DIV
AC-COUPLED
2μs/DIV
BACK PAGE APPLICATION CIRCUIT
LOAD RELEASE = 30A TO 10A
VIN = 5V
VOUT = 0.6V
SHADING OBTAINED WITH INFINITE PERSISTENCE ON
OSCILLOSCOPE WAVEFORMS
3839 G07
Load Release with Detect Transient (DTR)
Feature Disabled
SW1
5V/DIV
SW2
5V/DIV
ILOAD
20A/DIV
VOUT
20mV/DIV
AC-COUPLED
2μs/DIV
BACK PAGE APPLICATION CIRCUIT,
MODIFIED: RITH = 16.5k (â36.5k/30.1k)
LOAD RELEASE = 30A TO 10A
VIN = 5V
VOUT = 0.6V
3839 G08
3839fa
5
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