RDK-242 Power Integrations, RDK-242 Datasheet - Page 44

• Manufacturer Part Number: RDK-242
• Description: Power Management Modules & Development Tools TOPSwitch-JX REF. DESIGN KIT
• Manufacturer: Power Integrations
• Type: MOSFET & Power Driverr

Specifications of RDK-242

• Input Voltage: 85 VAC to 264 VAC
• Output Voltage: 12 V
• Maximum Operating Temperature: + 40 C
• Minimum Operating Temperature: 0 C
• Operating Supply Voltage: 85 VAC to 264 VAC
• Product: Power Management Modules

12.9 Output Ripple Measurements
12.9.1 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 F / 50 V ceramic type and one (1) 47.0 F / 50 V
aluminum electrolytic. The aluminum electrolytic type capacitor is polarized, so proper
polarity across DC outputs must be maintained (see below).
Figure 46 – Oscilloscope Probe with Probe Master (www.probemaster.com) 4987A BNC Adapter.
Figure 45 – Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
(Modified with wires for ripple measurement, and two parallel decoupling capacitors added)
Power Integrations, Inc.
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www.powerint.com
Probe Ground
Probe Tip
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