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| LTC3838-2_15 Datasheet, PDF (6/56 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with xternal Reference Voltage and Dual Differential Output Sensing | |||
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LTC3838-2
TYPICAL PERFORMANCE CHARACTERISTICS
Transient Response
(Forced Continuous Mode)
ILOAD
10A/DIV
Load Step
(Forced Continuous Mode)
ILOAD
10A/DIV
Load Release
(Forced Continuous Mode)
ILOAD
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
IL
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
IL
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
IL
10A/DIV
50µs/DIV
LOAD TRANSIENT = 0A TO 15A TO 0A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
38382 G01
5µs/DIV
LOAD STEP = 0A TO 15A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
38382 G02
5µs/DIV
LOAD RELEASE = 15A TO 0A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
38382 G03
Transient Response
(Discontinuous Mode)
ILOAD
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
IL
10A/DIV
Load Step
(Discontinuous Mode)
ILOAD
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
IL
10A/DIV
50µs/DIV
38382 G04
LOAD TRANSIENT = 500mA TO 15A TO 500mA
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
5µs/DIV
LOAD STEP = 500mA TO 15A
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
Load Release
(Discontinuous Mode)
ILOAD
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
IL
10A/DIV
38382 G05
5µs/DIV
LOAD RELEASE = 15A TO 500mA
VIN = 12V
VOUT = 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
38382 G06
Load Release with Detect Transient (DTR)
Feature Enabled
Load Release with Detect Transient (DTR)
Feature Disabled
SW
3V/DIV
VOUT
50mV/DIV
AC-COUPLED
ITH
1V/DIV
IL
10A/DIV
5µs/DIV
LOAD RELEASE = 15A TO 5A
VIN = 5V
VOUT = 0.6V
38382 G07
FIGURE 17 CIRCUIT, CHANNEL 1 MODIFIED:
RFB2 = 0Ω, CITH1 = 120pF, CITH2 = 0pF,
FROM DTR1 PIN: RITH1 = 46.4k TO SGND, RITH2 = 42.2k TO INTVCC
SHADING OBTAINED WITH INFINITE PERSISTENCE ON
OSCILLOSCOPE WAVEFORMS
SW
3V/DIV
VOUT
50mV/DIV
AC-COUPLED
ITH
1V/DIV
IL
10A/DIV
5µs/DIV
LOAD RELEASE = 15A TO 5A
VIN = 5V
VOUT = 0.6V
38382 G08
FIGURE 17 CIRCUIT, CHANNEL 1 MODIFIED:
RFB2 = 0Ω, CITH1 = 120pF, CITH2 = 0pF,
RITH1/2 = 46.4k TO SGND//42.2k TO INTVCC,
CONNECTION FROM RITH1/2 AND CITH1 TO DTR1 PIN REMOVED.
DTR1 PIN TIED TO INTVCC
6
For more information www.linear.com/3838-2
38382f
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