RDK-138 Power Integrations, RDK-138 Datasheet - Page 2

• Manufacturer Part Number: RDK-138
• Description: KIT REF DESIGN 1.2W PS TN FAMILY
• Manufacturer: Power Integrations

Specifications of RDK-138

• Mfg Application Notes: LinkSwitch-TN Design Guide, AN-37
• Main Purpose: AC/DC, Non-Isolated
• Outputs And Type: 2, Non-Isolated
• Power - Output: 1.2W
• Voltage - Output: 12V, 5V
• Current - Output: 80mA, 50mA
• Voltage - Input: 85 ~ 265VAC
• Regulator Topology: Buck
• Frequency - Switching: 66kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LNK304
• Product: Accessories & Kits
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 596-1197

Table of Contents
1
2
3
4
5
6
7
8
9
10
11
12
Important Note:
Although this board is designed to satisfy safety isolation requirements, the engineering
prototype has not been agency approved. Therefore, all testing should be performed
using an isolation transformer to provide the AC input to the prototype board.
4.1
4.2
4.3
4.4
4.5
7.1
7.2
7.3
9.1
9.2
9.3
9.4
9.5
Introduction.................................................................................................................3
Power Supply Specification ........................................................................................4
Schematic...................................................................................................................5
Circuit Description ......................................................................................................6
PCB Layout ................................................................................................................9
Bill of Materials .........................................................................................................10
Performance Data ....................................................................................................11
7.1.1
7.3.1
7.3.2
Thermal Performance...............................................................................................16
Waveforms ...............................................................................................................17
9.5.1
9.5.2
Conducted EMI .....................................................................................................23
Line Surge.............................................................................................................24
Revision History ....................................................................................................25
AC Input Rectification and EMI Filtering ..............................................................6
LinkSwitch-TN Device .........................................................................................6
Output Rectification and Filtering ........................................................................7
Feedback Network ..............................................................................................7
Linear Regulator..................................................................................................8
Efficiency ...........................................................................................................11
No-load Input Power..........................................................................................13
Regulation .........................................................................................................13
Drain Voltage and Current, Normal Operation...................................................17
Output Voltage Start-up Profile..........................................................................17
Source Voltage and Drain Current Start-up Profile............................................18
Load Transient Response (75% to 100% Load Step) .......................................19
Output Ripple Measurements............................................................................21
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Active Mode CEC Measurement Data........................................................11
Load and Line ............................................................................................13
Line ............................................................................................................15
Ripple Measurement Technique ................................................................21
Measurement Results ................................................................................22
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