EPR-93 datasheet(30/40 Pages) POWERINT

Part #	EPR-93

Description	Engineering Prototype Report for EP 93 - 32 W/81 W Peak Supply Using PeakSwitch- (PKS606Y)

PDF	40 Pages

Scroll/Zoom	100%

Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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30 / 40 page

EP-93 – 30 V, 1.07 A, 2.7 A (peak), Universal Input Supply

22-Jun-2006

Page 30 of 40

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

12 Output Ripple Measurements

12.1.1 Ripple Measurement Technique

For DC output ripple measurements, a modified oscilloscope test probe must be used to

reduce spurious signals due to pickup. Details of the probe modification are provided in

Figure 30 and Figure 31.

The Probe Master 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).

Figure 30 – Oscilloscope Probe Prepared for Ripple Measurement (End Cap and Ground Lead Removed).

Figure 31 – Oscilloscope Probe with Probe Master 5125BA BNC Adapter (Modified with Wires for Probe

Ground for Ripple Measurement, and Two Parallel Decoupling Capacitors Added).

Probe Ground

Probe Tip

EPR-93 Datasheet(PDF) 30 Page - Power Integrations, Inc.