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dc1928af
DEMO MANUAL DC1928A
QUICK START PROCEDURE
Demonstration circuit DC1928A is easy to set up to evalu-
ate the performance of the LTC3867EUF. Please refer to
Figure 2 for proper measurement equipment setup and
follow the procedure below:
1. Place jumpers in the following positions for a typical
application:
JP2: On
JP3: CCM
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and V
IN
supply to 24V.
3. Turn on the power supply at the input.
Note: Make sure that the input voltage does not exceed 36V.
4. Check the output voltage. The output voltage should
be between 11.76V and 12.24V.
Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, output voltage ripple, efficiency and
other parameters.
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 VIN or
VOUT and GND terminals. See Figure 2 for proper scope
probe technique.
5. Change JP3 jumper position to select different operation
modes. Set jumper to CCM, BURST or P.S. position
toe set forced continuous conduction, burst or pulse-
skipping mode respectively. For synchronizing to an
external clock source, set the jumper to BURST position
and apply the clock signal to MODE/PLLIN turret.
Figure 1. Test Setup of DC1928A
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