DAK-21A Power Integrations, DAK-21A Datasheet - Page 24

• Manufacturer Part Number: DAK-21A
• Description: KIT DESIGN ACCELERATOR DPA SW
• Manufacturer: Power Integrations
• Series: DPA-Switch®r

Specifications of DAK-21A

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 5V
• Current - Output: 6A
• Voltage - Input: 36 ~ 72V
• Regulator Topology: Buck
• Frequency - Switching: 400kHz
• Board Type: Fully Populated
• Utilized Ic / Part: DPA423, DPA424, DPA425, DPA426
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

12.4 Output Ripple Measurements
12.4.1 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 Figure 29 and Figure 30.
The 5125BA 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) 1.0 F/50 V
aluminum electrolytic. The aluminum electrolytic type capacitor is polarized, so proper
polarity across DC outputs must be maintained (see below).
Power Integrations, Inc.
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Figure 29
Figure 30
(End Cap and Ground Lead Removed).
(Modified with wires for probe ground for ripple measurement, and two
parallel decoupling capacitors added).
Oscilloscope Probe Prepared for Ripple Measurement.
Oscilloscope Probe with Probe Master 5125BA BNC Adapter.
Probe Ground
Probe Tip
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