5
dc1839af
DEMO MANUAL DC1839A
QUICK START PROCEDURE
Figure 4. V
DDQ
Load Step Response
Figure 5. V
TT
Load Step Response
Figure 6. LTC3634 DC1839A Start-Up with Soft-Start
V
IN
= 12V
V
DDQ
= 1.8V
3A LOAD STEP (0A TO 3A)
FORCED CONTINUOUS MODE
f
SW
= 1MHz
EXTERNAL COMPENSATION: R
ITH1
= 18.2k, C
ITH1
= 680pF
TRACE 3: OUTPUT VOLTAGE (50mV/DIV AC)
TRACE 4: OUTPUT CURRENT (1A/DIV)
dc1839a F04
V
IN
= 12V
V
TT
= 0.9V
±3A LOAD STEP (–3A TO 3A)
FORCED CONTINUOUS MODE
f
SW
= 1MHz
EXTERNAL COMPENSATION: R
ITH2
= 15k, C
ITH2
= 1000pF
TRACE 3: OUTPUT VOLTAGE (50mV/DIV AC)
TRACE 4: OUTPUT CURRENT (2A/DIV)
dc1839a F05
V
IN
= 12V
V
DDQ
= 1.8V
V
TT
= 0.9V
3A LOAD (EACH)
FORCED CONTINUOUS MODE
f
SW
= 1MHz
C
SS
= 4700pF
TRACE 1: V
DDQ
OUTPUT (500mV/DIV)
TRACE 2: V
TT
OUTPUT (500mV/DIV)
TRACE 3: VTTR OUTPUT (1V/DIV)
TRACE 4: V
RUN
VOLTAGE (2V/DIV)
dc1839a F06
