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dc2251af
DEMO MANUAL DC2251A
Quick start proceDure
Figure 4. Proper Measurement Equipment Setup
7. JP1 is placed on BURST position by default, for the low
ripple Burst Mode operation. When JP1 is placed on
SYNC position, LTM8065 can operate in pulse-skipping
mode, spread spectrum mode or synchronization mode
respectively, based on the different SYNC terminal
inputs. If SYNC terminal is floating, LTM8065 is in
pulse-skipping mode. If an external clock is driving the
SYNC terminal, LTM8065 is in synchronization mode.
Please make sure that RT should be choseN to set the
LTM8065 switching frequency equal to or below the
lowest SYNC frequency. If a 2.9V to 4.2V DC voltage
is tied to the SYNC terminal, LTM8065 is in spread
spectrum mode. This DC voltage can also be added
through a voltage divider (R7 and R8) from the output.
The recommended divider bottom resistor (R8) is 200k.
DC2251A F03
+
–
+
–
V
OUT
I
OUT
–
+
+
–
–
+
LOAD
V
IN
I
IN
POWER
SUPPLY
+
–
Figure 3. Measuring Output Ripple
+
–
V
OUT
GND
C5
DC2251A F04
