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AN3286 データシート(PDF) 14 Page - STMicroelectronics |
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AN3286 データシート(HTML) 14 Page - STMicroelectronics |
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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) 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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