DER-4

2.4W Cell Phone Charger

February 4, 2004

Page 12 of 20

Power Integrations

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7

Performance Data

All measurements are performed at room temperature unless otherwise specified. The

output voltages are measured at the end of a 6-foot cable with 0.2

Ω total resistance.

7.1

Efficiency

The measurements are made for various load and line conditions. The efficiencies are

calculated and shown in Figure 5.

Efficiency Vs Output Current

30.00

35.00

40.00

45.00

50.00

55.00

60.00

65.00

70.00

50

100

150

200

250

300

350

400

Output Current (mA)

Vin = 90 Vac

Vin = 120 Vac

Vin = 220 Vac

Vin = 264 Vac

Figure 5 – Efficiency Vs Output Current