Quick Start Procedure - Linear Technology DC1900A Demo Manual

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
RUN1
ON
JP8
MODE1
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.
2
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JP2 JP3
RUN2 RUN3
ON ON
JP7 JP6
MODE2 MODE3
CCM CCM
Figure 1. Test Setup of DC1900A
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
JP4
the load currents for each phase within the 0A to 4A
RUN4
range and observe the load regulation, efficiency, and
ON
other parameters.
JP5
6. To observe increased light load efficiency place a Mode
MODE4
pin jumper (JP5-JP8) in the DCM Mode position.
CCM
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.
dc1900af