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AN3286 Scheda tecnica(PDF) 14 Page - STMicroelectronics

Il numero della parte AN3286
Spiegazioni elettronici  This document describes
PDF  42 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3286 Scheda tecnica(HTML) 14 Page - STMicroelectronics

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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)
90
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)
VOUT (mV)
VOUT (mV)
90
45
19
50
115
461638
230
482228
265
482527



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