AN2544 Circuit operation
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1.9 Performance
Regulation for the VIPer22A-E and VIPer12A-E can be seen below. Keep in mind that the
buck topology will peak charge at zero load. DZ1 will clamp the voltage to 3 - 4 V above the
output. Load regulation is taken from 0.03 A to 0.35 A.
Note: The following measurements were taken on the appropriate version of the boards.
Discrepancy of measurements can be present, which is to be expected due to the 5%
tolerance of the Zener and equipment used for the measurements. The measurements
shown are at room temperature. If higher operating temperatures are used, current loads
must be adjusted accordingly.
Table 5. VIPer22ADIP-E, 12 V at 350 mA
VIPer22 buck 12 V / 350 mA
Vin 12 V load 12 V W in Efficiency
90 V
ac
0 15.81 0.12
90 V
ac
0.03 12.58 0.45
90 V
ac
0.35 11.7 5.64 72.6%
264 V
ac
0.35 12.21 6.12 69.8%
MIN 11.7
MAX 12.58
DELTA 0.88
Line reg. 6.0%
+/- % load reg (.03 to max) 3.8%
Ripple mv pp at 120 V
ac
52
Blue Angel at no-load at 115 V
ac
in W 0.12
Short circuit ok
Table 6. VIPer12ADIP-E, 12 V at 200 mA
VIPer12 buck 12 V / 200 mA #1
Vin 12 V load 12 V W in Efficiency
90 V
ac
0 15.6 0.15
90 V
ac
0.03 12.7 0.495
90 V
ac
0.2 11.85 3.06 77.5%
264 V
ac
0.2 12.1 3.25 74.5%
MIN 11.85
MAX 12.7
DELTA 0.85
Line Reg. 2.9%
+/- % load reg (.03 to max) 3.6%
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