3
dc2469af
DEMO MANUAL DC2469A
loads are not set too high, and the headers of EN/UVLO,
TRKSS1, TRKSS2, RUN3 are set in right positions.
5. Once the proper output voltage is established, adjust
the input voltage and load currents within the operating
range, and observe the output voltage regulation, tran-
sient, ripple voltage, efficiency and other parameters.
By default the circuit is set in low ripple Burst Mode
operation with SYNC grounded. Remove R11, and add
0Ω at R10, the circuit is set in pulse-skipping mode.
The circuit runs in full frequency with lower load cur-
rent in this mode. To synchronize to an external clock,
apply the external clock to the SYNC turret.
QUICK START PROCEDURE
6. When measuring the input or output voltage ripples,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output volt-
age ripple by touching the probe tip directly across the
V
IN
or V
OUT
capacitor terminals. See Figure 2 for proper
scope probe technique.
NOTE:
Refer to the thermal derating curves in LT8603
data sheet for high input voltage and/or high ambient
temperature operations.
