EPR-54 Datasheet, PDF (22/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 54 - 2.75 W Charger/Adapter Using LNK520P

EPR-54 – LinkSwitch 2.75 W Low Cost Charger / Adapter
9 Waveforms
9.1 Drain Voltage and Current, Normal Operation
07-May-2004
Figure 12 - 85 VAC, Full Load.
Upper: I_DRAIN, 0.1 A / div.
Lower: V_DRAIN, 100 V, 5 µs / div.
Figure 13 - 265 VAC, Full Load.
Upper: I_DRAIN, 0.1 A / div.
Lower: V_DRAIN, 200 V / div, 5 µs / div.
9.2 Output Voltage Start-up Profile (Battery Load)
The power supply was started up into an output load simulating a battery. Resistor R_LOAD
was reduced and confirmed start-up at voltages to 3 V. The battery model included
series resistor value of 2.5 Ω (R_LOAD) and internal capacitor resistance of 0.5 Ω (R_{INT_RES}).
The cable resistance R_CABLE was set to zero as the load was attached to the end of the
actual output cable.
Figure 14 – Battery load model.
Power Integrations
Tel: [phone] Fax: [phone]
www.powerint.com
Page 22 of 40