RDK-251 Power Integrations, RDK-251 Datasheet - Page 3

• Manufacturer Part Number: RDK-251
• Description: KIT REF DESIGN FOR LNK457D
• Manufacturer: Power Integrations
• Series: LinkSwitch®-PLr

Specifications of RDK-251

• Current - Output / Channel: 350mA
• Outputs And Type: 1, Isolated
• Voltage - Output: 12 ~ 18 V
• Features: Dimmable
• Voltage - Input: 90 ~ 265VAC
• Utilized Ic / Part: LNK457D
• Output Voltage: 12 V
• Input / Supply Voltage (max): 265 VAC
• Input / Supply Voltage (min): 90 VAC
• Duty Cycle (max): 39.9 %
• Mounting Style: Through Hole
• Output Current: 350 mA
• Output Power: 5 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 596-1345

Table of Contents
1
2
3
4
5
6
7
8
9
10
11
Page 3 of 60
4.1
4.2
4.3
4.4
4.5
4.6
4.7
8.1
8.2
8.3
8.4
8.5
8.6
9.1
9.2
9.3
9.4
9.5
9.6
9.7
10.1
10.2
10.3
10.4
11.1
11.2
Introduction .................................................................................................................5
Power Supply Specification ........................................................................................7
Schematic ...................................................................................................................8
Circuit Description.......................................................................................................9
PCB Layout...............................................................................................................12
Bill of Materials .........................................................................................................13
Transformer Design Spreadsheet .............................................................................14
Transformer Specification .........................................................................................17
Performance Data.....................................................................................................23
9.7.1
9.7.2
11.1.1
11.1.2
11.1.3
11.1.4
11.1.5
Thermal Performance............................................................................................35
Waveforms ............................................................................................................38
Dimming Performance Circuit Design Considerations .........................................9
Input EMI Filtering and Input Rectification .........................................................10
Active Damper ...................................................................................................10
Bleeder ..............................................................................................................10
LinkSwitch-PL Primary.......................................................................................11
Output Rectification ...........................................................................................11
Output Feedback ...............................................................................................11
Electrical Diagram..............................................................................................17
Electrical Specifications .....................................................................................17
Materials ............................................................................................................17
Transformer Build Diagram................................................................................18
Transformer Construction ..................................................................................19
Winding Illustrations...........................................................................................20
Active Mode Efficiency.......................................................................................23
Non-Dimmable Configuration ............................................................................24
Dimmable ..........................................................................................................24
Harmonics .........................................................................................................25
Power Factor .....................................................................................................27
Line Regulation..................................................................................................28
Dimming Performance .......................................................................................29
Thermal Set-up ..................................................................................................35
Equipment Used ................................................................................................36
Thermal Result ..................................................................................................36
Thermal Scan ....................................................................................................37
Drain Voltage and Current .................................................................................38
Output Current Start-up Profile ..........................................................................44
Dimming Range..........................................................................................29
Unit to Unit Tracking ...................................................................................33
Normal Steady State Operation..................................................................38
AC Start-up.................................................................................................40
115 V TRIAC in Series with AC Input .........................................................40
230 V TRIAC in Series with AC Input .........................................................42
Fault Conditions (Output Shorted / Open Circuit) .......................................43
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