AN2708 datasheet(40/42 Pages) STMICROELECTRONICS

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DALI master AC-DC adapter

AN2708

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5.3.6

Efficiency variation

For this test the efficiency is measured when the line input is varied from 85 Vac to

264 Vac at full load. The average efficiency is 66.5%. A moderate value is typical of low

power applications.

Figure 39.

Efficiency variations vs. input voltage at full load

5.3.7

Conducted emissions test

Conducted emissions have been measured in neutral and line wires, using peak detector

and considering the limits for lighting applications i.e. EN55015. The measurements have

been performed at 110 Vac and 230 Vac line with fully loaded outputs. The results are

shown in Figure 40, 41, 42, and 43.

Since the emission level is below both the quasi-peak and average limits with acceptable

margin, the power supply passes the pre-compliance test.

52.5

57.5

62.5

67.5

72.5

77.5

100

110

120

140

160

170

180

190

200

210

220

230

240

250

260

270

290

310

Input Voltage(Vac)

Efficiency

Figure 40.

Conducted emissions at 110 Vac

60 Hz - full load - line 1 peak

detector

Figure 41.

Conducted emissions at 110 Vac

60 Hz - full load - line 2 peak

detector

01:55:30 Apr 10, 2007

Ref 75 dB

µV#Atten 10 dB

Peak

Log

dB/

W1 S2

S3 FC

Start 150 kHz

Res BW 9 kHz

VBW 30 kHz

Stop 30 MHz

Sweep 881.3 ms (2115 pts)

01:55:07 Apr 10, 2007

Ref 75 dB

µV#Atten 10 dB

Peak

Log

dB/

W1 S2

S3 FC

Start 150 kHz

Res BW 9 kHz

VBW 30 kHz

Stop 30 MHz

Sweep 881.3 ms (2115 pts)

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