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AN2950 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN2950
Description  This document describes
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2950 Datasheet(HTML) 12 Page - STMicroelectronics

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Testing the board
AN2950
12/37
Doc ID 15494 Rev 1
2.2
Regulation precision and output voltage ripple
The output voltage of the board has been measured with different line and load conditions.
The results are reported in Table 5. The output voltage is not affected by the line condition.
The VDD voltage has also been measured to verify that it is within the device’s operating
range.
As confirmed by the results reported in Table 5, the VDD voltage (unregulated auxiliary
output) increases as the load on the regulated output increases. To prevent the VDD voltage
from 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. The board is provided with an LC filter to
better filter the voltage ripple.
Figure 11.
Drain current and voltage at peak
load 90 VAC
Figure 12.
Drain current and voltage at peak
load 265 VAC
Table 5.
Output voltage and VDD line-load regulation
VIN_AC
(V)
No load
Half load
Full load
Peak load
VOUT (V)
VDD (V)
VOUT (V)
VDD (V)
VOUT (V)
VDD (V)
VOUT (V)
VDD (V)
90
5.02
10.8
4.99
18.8
4.99
19.6
4.98
20.5
115
5.02
10.4
4.99
18.7
4.99
19.5
4.98
20.3
230
5.02
10.3
4.99
18.6
4.99
19.4
4.98
20
265
5.02
10.1
4.99
18.5
4.99
19.2
4.98
19.8
Table 6.
Output voltage ripple
VIN_AC (V)
Half load
Full load
Peak load
VOUT (mV)
VOUT (mV)
VOUT (mV)
90
15
17
30
115
14
21
28
230
15
22
25
265
14
20
24



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