Quick Start Procedure - Linear Technology DC1948A Demo Manual

DEMO MANUAL DC1948A

Quick start proceDure

Demonstration circuit 1948A is easy to set up to evalu-
ate the performance of the LT3090. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
NOTE. 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 terminals of the input or output capacitors. See
Figure 2 for proper scope probe technique.
1. Use JP2 to set the desired output voltage.
2. Put JP4 on ON position.
3. With power off, connect the input power supply to VIN
and GND.
2
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4. Turn on the power at the VIN.
NOTE. Make sure that the VIN voltage does not exceed
–36V.
5. Check for the proper output voltages:
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high or
is shorted.
6. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, efficiency and other param-
eters.
NOTE. Make sure that the power dissipation is limited
below the thermal limit.
Figure 1. DC1948A Proper Equipment Setup
Figure 2. Measuring Input or Output Ripple
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