Quick Start Procedure - Linear Technology DC1734A Demo Manual

DEMO MANUAL DC1734A

QUICK START PROCEDURE

Demonstration circuit DC1734A is easy to set up to evalu-
ate the performance of the LT8582. Refer to Figure 1 for
proper measurement equipment set-up and follow the
procedure below.
To measure voltage ripple, care must be taken to avoid a
long ground lead on the oscilloscope probe. Remove the
oscilloscope probe end cap and ground lead and set the
bandwidth limit on the oscilloscope. Measure the input
voltage ripple by touching the probe tip and ground directly
across V and GND terminals. See Figure 2 for proper
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input voltage ripple measurement technique. Measure the
positive output voltage ripple by touching the probe tip
directly across output capacitor C16 terminals, connect-
ing the probe ground terminal to the board's GND plane.
Measure the negative output voltage ripple by touching the
probe tip directly across output capacitor C9, connecting
the probe ground terminal to the board's GND plane. See
Figure 3 for proper output voltage ripple measurement
technique.
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1. Place the on board jumpers in the following positions:
To activate boost converter: JP1 ON
To activate inverting converter: JP2 ON
2. With power off, connect the input power supply to V
and GND. Apply 7.5V to the input (source must have
greater than 10A capability).
3. 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.
4. Once the proper output voltage is established, adjust
the load and the input voltage within the operating
range and observe the output voltage regulation, ripple
voltage, efficiency and other parameters. The efficiency
graphs of the two channels are provided in Figure 4
and Figure 5.
Figure 1. Proper Measurement Equipment Setup
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dc1734af