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dc2569af
DEMO MANUAL DC2569A
QUICK START PROCEDURE
Figure 2. Measuring Input or Output Ripple
Figure 1. Proper Measurement Equipment Setup
+ –
+ –
+
–
+
–
+
–
+
–
LOAD
I
OUT
I
IN
V
OUT
V
IN
LAB
SUPPLY
DC2569A
+
–
V
OUT
GND
C
OUT
Demonstration circuit DC2569 is easy to set up to evaluate
the performance of the LTM4661. For proper measure-
ment equipment setup refer to Figure 1 and follow the
procedure below:
NOTE: When measuring the input or output voltage ripple,
care must be taken to minimize the length of oscilloscope
probe ground lead. Measure the input or output voltage
ripple by connecting the probe tip directly across the V
IN
or V
OUT
and GND terminals as shown in Figure 2.
1. With power off, connect the input power supply to V
IN
and GND.
2. Keep the load set to 0A or disconnected.
3. Turn the input power source on and slowly increase the
input voltage. Be careful not to exceed 5.5V.
NOTE: Make sure that the input voltage V
IN
does not
exceed 5.5V.
4. Set the input voltage to 5V and check for the proper
output voltage of 12V. If there is no output, temporarily
disconnect the load to make sure that the load is not
set too high.
5. Once the proper output voltage is established, adjust
the load and observe the output voltage regulation,
ripple voltage, efficiency and other parameters.
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