EPR-48 Datasheet, PDF (7/20 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP48 - 1.4 W Non-Isolated Buck Converter Using LNK304P

02-May-2005
EP48 – 12 V, 1.44 W, Non-Isolated Buck Converter
4.5 Operation Below Minimum Drain Voltage Specification
In certain abnormal conditions, the drain voltage can drop below the minimum drain
voltage specification of 50 V. If these conditions exist in combination with very light
output loading (<5 mA), it is possible for the output voltage to go out of regulation.
These abnormal conditions can exist, for example, during a brownout condition when the
input voltage can drop to <30 VAC. To avoid the output voltage exceeding acceptable
levels under these conditions, the output of the power supply has to either be pre-loaded
with 5 mA or the output has to be clamped with an appropriate Zener diode (e.g. 15 V,
1.3 W device).
5 PCB Layout
Figure 3 – EP48 Printed Circuit Layout (Dimension 0.001 Inches).
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