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EPR-71 Datasheet(PDF) 18 Page - Power Integrations, Inc.

Part # EPR-71
Description  Engineering Prototype Report for EP 71 - 6.6 W DC-DC Converter Using DPA Switch- (DPA423G)
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

EPR-71 Datasheet(HTML) 18 Page - Power Integrations, Inc.

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EP-71 3.3 V, 2 A DC-DC Power Supply
19-Jul-2005
10.5 Output Ripple Measurements
10.5.1 Ripple Measurement Technique
For DC output ripple measurements, a modified oscilloscope test probe must be utilized
in order to reduce spurious signals due to pickup. Details of the probe modification are
provided in Figures 19 and 20.
The 5125BA probe adapter is affixed with two capacitors tied in parallel across the probe
tip. The capacitors include one (1) 0.1
µF/50 V ceramic type and one (1) 1.0 µF/50 V
aluminum electrolytic.
The aluminum electrolytic type capacitor is polarized, so
proper polarity across DC outputs must be maintained (see below).
Probe Ground
Probe Tip
Figure 19 - Oscilloscope Probe Prepared for Ripple Measurement (End Cap and Ground Lead Removed).
Figure 20 - Oscilloscope Probe with Probe Master 5125BA BNC Adapter (Modified with Wires for Probe
Ground for Ripple Measurement, and Two Parallel Decoupling Capacitors Added).
Page 18 of 28
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com


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