RDK-128 Power Integrations, RDK-128 Datasheet - Page 27

• Manufacturer Part Number: RDK-128
• Description: KIT REF DESIGN 36-72W MOTOR DRVR
• Manufacturer: Power Integrations

Specifications of RDK-128

• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: PKS606
• Primary Attributes: Variable Speed 12V 36W DC Motor, 90 ~ 265 VAC
• Secondary Attributes: External Potentiometer or Variable DC Voltage Speed Control
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 596-1198

16-Aug-07
RDR-128 36 W, 72 W Peak Variable Output Power Supply
10.7 Output Ripple Measurements
10.7.1 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 the figures below.
The 4987BA 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 27 – Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
Figure 28 – Oscilloscope Probe with Probe Master (www.probemaster.com) 4987A BNC Adapter.
(Modified with wires for ripple measurement and two parallel decoupling capacitors added)
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