RDK-242 Power Integrations, RDK-242 Datasheet - Page 44
RDK-242
Manufacturer Part Number
RDK-242
Description
Power Management Modules & Development Tools TOPSwitch-JX REF. DESIGN KIT
Manufacturer
Power Integrations
Type
MOSFET & Power Driverr
Datasheet
1.RDK-242.pdf
(59 pages)
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
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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.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Probe Ground
Probe Tip
Page 44 of 59
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