AN2683 datasheet(28/38 Pages) STMICROELECTRONICS

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Functional testing

AN2683

28/38

The graphs in Figure 14 and 15 show that the 1.8 V output has better efficiency than the 1.0

V output, in the high eighties at high current levels. Along with the efficiency measurements

further functional testing was conducted as outlined in the following sections.

4.1

Input/output voltage

The input voltage was swept from 10.2 to 16 VDC at the load levels indicated. The output

voltage was recorded at each level and did not vary more than 1 mV over the entire input

range. Input/output voltage at different load levels.

4.2

Ripple/noise voltage

The maximum peak to peak ripple voltage was measured at the load level indicated.

4.3

Load transient overshoot

The output load levels were varied in a stepwise fashion at the percentage and load levels

indicated. The maximum change in output voltage was recorded in the following

oscilloscope photographs.

Table 2.

1.0 VDC output

Load current

Output voltage

50 mA

0.998 VDC

7.5 A

1.019 VDC

10.5 A

1.027 VDC

Table 3.

1.8 VDC output

Load current

Output voltage

50 mA

1.792 VDC

1.8 A

1.794 VDC

2.5 A

1.794 VDC

Table 4.

1.0 VDC output

Load current

Ripple voltage p-p

10.5 A

25 mV

Table 5.

1.8 VDC output

Load current

Ripple voltage p-p

2.5 A

20 mV

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