2

dc1900af

DEMO MANUAL DC1900A

Quick start proceDure

Demonstrationcircuit1900Aisaneasywayto evaluatethe

performance of the LTM4644EY. Please refer to Figure 1

fortestsetupconnectionsandfollowtheprocedurebelow.

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