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User's Guide
SLUU523–July 2011
Using the TPS92070EVM-648 Integrated Dimming LED
Lighting Driver Converter for 230 VAC Input
The TPS92070EVM-648 evaluation module (EVM) is a low power isolated flyback converter that provides
5 on-board LEDs with 370 mA of drive current from a nominal 230 VAC input. This EVM is designed to
demonstrate the TPS92070 in a typical application where LEDs can be used for general illumination
applications that require dimming.
Contents
1 Description ................................................................................................................... 2
1.1 Typical Applications ................................................................................................ 2
1.2 Features ............................................................................................................. 3
2 Electrical Performance Specifications .................................................................................... 3
3 Schematic .................................................................................................................... 4
4 Test Setup ................................................................................................................... 5
4.1 Test Equipment ..................................................................................................... 5
4.2 Recommended Test Setup ....................................................................................... 6
4.3 List of Test Points .................................................................................................. 6
5 Test Procedure .............................................................................................................. 7
5.1 Line Regulation and Efficiency Measurement Procedure .................................................... 7
5.2 Dimming ............................................................................................................. 7
5.3 Equipment Shutdown .............................................................................................. 7
6 Performance Data and Typical Characteristic Curves ................................................................. 7
6.1 Efficiency ............................................................................................................ 7
6.2 LED Current Regulation ........................................................................................... 8
6.3 Power Factor ....................................................................................................... 8
6.4 Average Conduction ............................................................................................... 9
6.5 Turn On .............................................................................................................. 9
6.6 Output Voltage Ripple ........................................................................................... 10
6.7 Output Current Ripple ............................................................................................ 11
6.8 AC Input ........................................................................................................... 11
6.9 Switching Waveform ............................................................................................. 12
6.10 TDD, No Dimmer ................................................................................................. 12
6.11 TDD, With Dimmer ............................................................................................... 13
6.12 Valley Detect ...................................................................................................... 13
6.13 Turn Off ............................................................................................................ 14
6.14 Dimmer Detection ................................................................................................ 14
7 EVM Assembly Drawing and PCB layout .............................................................................. 15
8 Bill of Materials ............................................................................................................. 18
List of Figures
1 TPS92070EVM-648 Schematic ........................................................................................... 4
2 TPS92070EVM-648 Recommended Test Set Up ...................................................................... 6
3 TPS92070EVM-648 Efficiency with Respect to Line Voltage, no Dimmer.......................................... 7
4 TPS92070EVM-648 LED Current Regulation with Respect to Line Voltage, no Dimmer......................... 8
5 TPS92070EVM-648 Power Factor with Respect to Line Voltage, no Dimmer...................................... 8
6 LED Current with Respect to Average Dimmer Conduction .......................................................... 9
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SLUU523–July 2011 Using the TPS92070EVM-648 Integrated Dimming LED Lighting Driver
Converter for 230 VAC Input
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