Datasheet

LTC3838
6
3838fa
TYPICAL PERFORMANCE CHARACTERISTICS
Transient Response
(Discontinuous Mode)
Load Release with Detect Transient (DTR)
Feature Enabled
Load Release with Detect Transient (DTR)
Feature Disabled
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
3838 G01
LOAD TRANSIENT = 0A TO 15A TO 0A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1, V
RNG1
= SGND
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
3838 G02
LOAD STEP = 0A TO 15A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1, V
RNG1
= SGND
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
3838 G03
LOAD RELEASE = 15A TO 0A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1, V
RNG1
= SGND
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
50µs/DIV
3838 G04
LOAD TRANSIENT = 500mA TO 15A TO 500mA
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1, V
RNG1
= SGND
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
3838 G05
LOAD STEP = 500mA TO 15A
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1, V
RNG1
= SGND
V
OUT
50mV/DIV
AC-COUPLED
I
LOAD
10A/DIV
I
L
10A/DIV
5µs/DIV
3838 G06
LOAD RELEASE = 15A TO 500mA
V
IN
= 12V
V
OUT
= 1.2V
FIGURE 17 CIRCUIT, CHANNEL 1, V
RNG1
= SGND
V
OUT
50mV/DIV
AC-COUPLED
SW
3V/DIV
V
OUT
50mV/DIV
AC-COUPLED
ITH
1V/DIV
I
L
10A/DIV
5µs/DIV
3838 G08
LOAD RELEASE = 15A TO 5A
V
IN
= 5V
V
OUT
= 0.6V
FIGURE 17 CIRCUIT, CHANNEL 1 MODIFIED:
R
FB2
= 0, V
RNG2
= SGND, 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
3838 G07
LOAD RELEASE = 15A TO 5A
V
IN
= 5V
V
OUT
= 0.6V
FIGURE 17 CIRCUIT, CHANNEL 1 MODIFIED:
R
FB2
= 0, V
RNG2
= SGND, C
ITH1
= 120pF, C
ITH2
= 0pF,
FROM DTR1 PIN: R
ITH1
= 46.4k TO SGND, R
ITH2
= 42.2k TO INTV
CC