AN3286 datasheet(14/42 Pages) STMICROELECTRONICS

14 / 42 page

Testing the board

AN3286

14/42

Doc ID 17998 Rev 1

2.2

Regulation precision and output voltage ripple

The output voltage of the board and the VDD pin voltage (rectified auxiliary output) have

been measured in different line and load conditions. The results are given in Table 5. The

output voltage practically is not affected by the line condition.

The VDD voltage increases with the load on the regulated output; in order to avoid it

exceeding its operating range an external clamp has been used (Dz, Rz).

The ripple at the switching frequency superimposed at the output voltage has also been

measured and the results are reported in Table 6.

Table 5.

Output voltage and VDD line-load regulation

VIN (VAC)

No load

Half load

Full load

VOUT (V)

VDD (V)

VOUT (V)

VDD (V)

VOUT (V)

VDD (V)

5.02

8.4

4.98

18.5

4.98

20.2

115

5.02

8.3

4.97

18.5

4.97

20.2

230

5.02

8.2

4.97

18.2

4.97

20.5

265

5.03

8.1

4.96

18.1

4.96

20.5

Table 6.

Output voltage ripple

VIN (VAC)

1/10 load

Half load

Full load

VOUT (mV)

115

461638

230

482228

265

482527

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