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dc2565af

DEMO MANUAL DC2565A

Quick start proceDure

DC2565A is easy to set up to evaluate the performance

of the LT8607. Refer to Figure 4 for proper measurement

equipment setup and follow the procedure below:

NOTE: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. See Figure 5 for the proper scope

technique.

1. Set an input power supply that is capable of 42V/0.75A.

Then turn off the supply.

2. With power off, connect the supply to the input termi-

3. Turn on the power at the input.

NOTE: Make sure that the input voltage never exceeds

42V.

4. Check for the proper output voltage of 5V. Turn off the

power at the input.

5. Once the proper output voltage is established, connect

a variable load capable of sinking 0.75A at 5V to the

a. If efficiency measurements are desired, an ammeter

can be put in series with the output load in order to

measure the DC2565A’s output current.

b. A voltmeter can be placed across the output ter-

minals in order to get an accurate output voltage

measurement.

6. Turn on the power at the input.

NOTE: If there is no output, temporarily disconnect the

load to make sure that the load is not set too high.

7. Once the proper output voltage is established again,

adjust the load and/or input within the operating range

and observe the output voltage regulation, ripple volt-

age, efficiency and other desired parameters.

8. An external clock can be added to the SYNC termi-

nal when SYNC function is used (JP1 on the SYNC

position). Please ensure that the chosen RT sets the

LT8607 switching frequency to equal or below the low-

est SYNC frequency. See the Synchronization section

in the data sheet.

Figure 1. Efficiency vs Load Current at 2MHz Switching Frequency

0

50

55

60

65

70

75

100

95

90

85

80

0.15

0.3

0.45

0.6

0.75

DC2565A F01