2
dc2328af
DEMO MANUAL DC2328A
Quick start proceDure
Demonstration circuit 2328A is easy to set up to evaluate
the performance of the LTM4651Y. Refer to Figure 1 for
the proper measurement equipment setup and follow the
procedure below:
1. With power off, connect the input power supply to V
IN
(12V to 34V) and GND (input return).
2. Connect the – 24V output load between V
OUT
( – ) and
GND (+) (Initial load: no load).
3. Connect the DVMs to the input and output. Set the
default jumper position, JP2: ON.
4. Turn on the input power supply and check for the
proper output voltages. V
OUT
should be –24V ±2%.
5. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage and other
parameters.
Note: When measuring the output or input voltage
ripple, do not use the long ground lead on the oscil-
loscope probe. See Figure 2 for the proper scope probe
technique. Short, stiff leads need to be soldered to
the (+) and (–) terminals of an output capacitor. The
probe’s ground ring needs to touch the (–) lead and
the probe tip needs to touch the (+) lead.
Figure 1. Proper Measurement Equipment Setup
Figure 2. Measuring Output Voltage Ripple
DC2328 F01
LOAD
V
IN
12V TO 34V
+
–
I
OUT
SHUNT
10mΩ
I
IN
SHUNT
10mΩ
+
–
–
+
V
IN
–
+
V
OUT
–
+
+
–
V
OUT
GND
C
OUT
