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dc1900af
DEMO MANUAL DC1900A
Quick start proceDure
Demonstration circuit 1900A is an easy way to evaluate the
performance of the LTM4644EY. Please refer to Figure 1
for test setup connections and follow the procedure below.
1. With power off, place the jumpers in the following
positions:
JP1
JP2
JP3
JP4
RUN1
RUN2
RUN3
RUN4
ON
ON
ON
ON
JP8
JP7
JP6
JP5
MODE1
MODE2
MODE3
MODE4
CCM
CCM
CCM
CCM
2. Before connecting input supply, loads and meters,
preset the input voltage supply to be between 4.5V to
14V. Preset the load currents to 0A.
3. With power off, connect the loads, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meters
for each phase should display the programmed output
voltage within ± 2%.
5. Once the proper output voltage is established, adjust
the load currents for each phase within the 0A to 4A
range and observe the load regulation, efficiency, and
other parameters.
6. To observe increased light load efficiency place a Mode
pin jumper (JP5-JP8) in the DCM Mode position.
Note: Optional jumper positions are available on the
DC1900A to allow for easy setup to evaluate parallel
operation of the LTM4644. For example, to parallel all
4 outputs of the LTM4644 together stuff 0Ω jumpers
for R32-R46.
Figure 1. Test Setup of DC1900A
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