Datasheet

LTC3838-1
6
38381f
For more information www.linear.com/3838-1
TYPICAL PERFORMANCE CHARACTERISTICS
Transient Response
(Discontinuous Mode)
Load Step
(Discontinuous Mode)
Load Release
(Discontinuous Mode)
Transient Response
(Forced Continuous Mode)
Load Step
(Forced Continuous Mode)
Load Release
(Forced Continuous Mode)
I
LOAD
10A/DIV
I
L
10A/DIV
50µs/DIV
38381 G01
LOAD TRANSIENT = 0A TO 15A TO 0A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
38381 G02
LOAD STEP = 0A TO 15A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
38381 G03
LOAD RELEASE = 15A TO 0A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
50µs/DIV
38381 G04
LOAD TRANSIENT = 500mA TO 15A TO 500mA
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
38381 G05
LOAD STEP = 500mA TO 15A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
38381 G06
LOAD RELEASE = 15A TO 500mA
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1
V
OUT
50mV/DIV
AC-COUPLED
Load Release with Detect Transient (DTR)
Feature Enabled
Load Release with Detect Transient (DTR)
Feature Disabled
SW
3V/DIV
V
OUT
50mV/DIV
AC-COUPLED
ITH
1V/DIV
I
L
10A/DIV
5µs/DIV
38381 G08
LOAD RELEASE = 15A TO 5A
V
IN
= 5V
V
OUT
= 0.6V
FIGURE 17 CIRCUIT, CHANNEL 1 MODIFIED:
R
FB2
= 0Ω, C
ITH1
= 120pF, C
ITH2
= 0pF,
R
ITH1/2
= 46.4k TO SGND//42.2k TO INTV
CC
,
CONNECTION FROM R
ITH1/2
AND C
ITH1
TO DTR1 PIN REMOVED.
DTR1 PIN TIED TO INTV
CC
SW
3V/DIV
V
OUT
50mV/DIV
AC-COUPLED
ITH
1V/DIV
I
L
10A/DIV
5µs/DIV
38381 G07
LOAD RELEASE = 15A TO 5A
V
IN
= 5V
V
OUT
= 0.6V
FIGURE 17 CIRCUIT, CHANNEL 1 MODIFIED:
R
FB2
= 0Ω, C
ITH1
= 120pF, C
ITH2
= 0pF,
FROM DTR1 PIN: R
ITH1
= 46.4k TO SGND, R
ITH2
= 42.2k TO INTV
CC
SHADING OBTAINED WITH INFINITE PERSISTENCE ON
OSCILLOSCOPE WAVEFORMS