DAK-21A Power Integrations, DAK-21A Datasheet - Page 2

• 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

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2
3
4
5
6
Transformer Specification ................................................................................................10
8
9
10 Performance Data.....................................................................................................17
11 Thermal Performance ...............................................................................................19
12 Waveforms................................................................................................................21
13 Control Loop Measurements.....................................................................................26
14 Revision History ........................................................................................................28
Important Note:
Although the EP-21 is designed to satisfy telecom safety isolation requirements, this
engineering prototype has not been agency approved.
4.1 Primary Circuitry......................................................................................................6
4.2 Output Rectification .................................................................................................6
4.3 Output Feedback.....................................................................................................7
4.4 Construction ............................................................................................................7
7.1 Electrical Specifications.........................................................................................10
7.2 Materials................................................................................................................10
7.3 Transformer Build Diagram ...................................................................................11
7.4 Transformer Construction......................................................................................11
8.1 Electrical Specifications.........................................................................................12
8.2 Materials................................................................................................................12
8.3 Inductor Build Diagram..........................................................................................13
8.4 Inductor Construction ............................................................................................13
10.1 Efficiency ...........................................................................................................17
10.2 Regulation .........................................................................................................18
12.1 Drain Voltage and Current, Normal Operation...................................................21
12.2 Output Voltage Start-up Profile..........................................................................22
12.3 Load Transient Response (75% to 100% Load Step)........................................23
12.4 Output Ripple Measurements ............................................................................24
13.1 Maximum Load 36 VDC.....................................................................................26
13.2 Maximum Load 48 VDC.....................................................................................26
13.3 Maximum Load 72 VDC.....................................................................................27
Introduction .................................................................................................................3
Power Supply Specification ........................................................................................4
Schematic ...................................................................................................................5
Circuit Description.......................................................................................................6
PCB Layout.................................................................................................................8
Bill Of Materials...........................................................................................................9
Inductor Specification................................................................................................12
PIXls Design Spreadsheet ........................................................................................14
10.2.1 Load Regulation .............................................................................................18
10.2.2 Line Regulation ..............................................................................................18
12.4.1 Ripple Measurement Technique ....................................................................24
12.4.2 Measurement Results ....................................................................................25
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
Table Of Contents
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