2
dc2105af
DEMO MANUAL DC2105A
Quick start proceDure
This DC2105A can be evaluated using the setup shown
in Figure 1.
1. Connect the DVMs to the input and output. Select 5V
setting using jumper JP1 (lower position) and JP2
(upper position), select ON position for JP3.
2. With input power supply set for 0V, connect the sup-
ply to V
IN
and GND terminals using short (less than
10 inches) leads, preferably twisted leads. Connect a
suitable load to V
OUT
and GND terminals.
3. Slowly increase the input power supply to 10V. Observe
output voltage and verify that it meets the specifications
in the Performance Summary. Measure output voltage
with and without the load.
4. Move jumpers JP1 and JP2 to the other two fixed volt-
age settings and verify that each output voltage meets
the values as shown in the Performance Summary.
5. Once the proper output voltages are established, adjust
the load and input voltage within the operating range
and observe the output voltage regulation, ripple volt-
age and other parameters.
NOTES:
1. IMPORTANT: 60V or higher voltage can result in an
electric shock if care is not taken. Also, hot plugging
the circuit to a power supply that has more than 40V
present at its output can produce a high voltage tran-
sient exceeding the absolute maximum input voltage
which can damage the LTC3630A/LTC3630.
2. When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the V
IN
or V
OUT
and GND terminals. See Figure 3 for proper
scope probe technique.
Figure 1. Proper Measurement Equipment Setup
NOTE:
A 10µF, 100V electrolytic capacitor is necessary when evaluating circuit
with input voltages greater than 40V, using long input wires and hot plugging
circuit into a powered input supply. See Figure 2.
