17-May-04
EPR-16 – LinkSwitch 2.75 W Charger/Adapter
11.3 Circuit Changes
All components other than those listed below, including the transformer, are identical to
the original EP-16 design. The modified EP-16 schematic is shown in Figure 30.
U1
R1
LNK501P replaced with LNK520P.
20.5 kΩ to 16.2 kΩ.
Reduced feedback resistor value to correct for increased value of R2 (reduces no-
load voltage).
R2
100 Ω to 430 Ω.
Increased leakage filtering to ensure supply enters auto-restart when output
voltage is below 2 V in CC region.
Figure 30 – Modified EP-16: Low Cost, 2.75 W Cell Phone Charger Using the LNK520P.
Power Integrations
Page 29 of 36
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