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User's Guide
SLVU818–January 2013
Using the TPS92660EVM
Abstract
Contents
1 Introduction .................................................................................................................. 2
2 Description ................................................................................................................... 2
2.1 Typical Applications ................................................................................................ 2
2.2 TPS92660 Features ............................................................................................... 2
3 Electrical Performance Specifications .................................................................................... 2
4 Schematic .................................................................................................................... 4
5 Test Setup ................................................................................................................... 5
5.1 Recommended Test Equipment ................................................................................. 5
5.2 Recommended Test Set Up ...................................................................................... 5
5.3 List of Test Points .................................................................................................. 5
5.4 Trim LED Current Using I
2
C Adapter ............................................................................ 6
6 Performance Data and Typical Characteristic Curves ................................................................. 8
6.1 Efficiency ............................................................................................................ 8
6.2 Line Regulation ..................................................................................................... 9
6.3 Switch Node Voltage and LED Current Ripple Waveforms ................................................. 10
6.4 Analog to PWM Dimming Waveforms ......................................................................... 10
6.5 Start-Up and Shut-down Waveforms .......................................................................... 12
7 TPS92660EVM PCB Layout ............................................................................................. 13
8 Bill of Materials (BOM) .................................................................................................... 14
List of Figures
1 TPS92660EVM Schematic ................................................................................................ 4
2 TPS92660EVM Recommended Test Set Up............................................................................ 5
3 USB Interface Adapter GUI................................................................................................ 7
4 TPS92660EVM Efficiency with 10 LEDs................................................................................. 8
5 TPS92660EVM Buck Converter Current Line Regulation with 8 LEDs.............................................. 9
6 TPS92660EVM Linear Regulator Current Line Regulation with 4 LEDs ............................................ 9
7 TPS92660EVM Buck Converter Switching Voltage and LED Current ............................................. 10
8 TPS92660EVM Buck Converter PWM Dimming, SADJ = 1.25 V................................................... 10
9 TPS92660EVM Buck Converter PWM Dimming, SADJ = 0.25 V................................................... 11
10 TPS92660EVM Linear Regulator PWM Dimming, LADJ = 1.25 V ................................................. 11
11 Buck Converter Start-Up Waveform .................................................................................... 12
12 Buck Converter Shut-Down Waveform................................................................................. 12
13 TPS92660EVM Top Layer and Top Overlay (Top View)............................................................. 13
14 TPS92660EVM Bottom Layer and Bottom Overlay (Bottom View)................................................. 13
List of Tables
1 TPS92660EVM Buck Converter Electrical Performance Specifications............................................. 2
2 TPS92660EVM Linear Regulator Electrical Performance Specifications............................................ 3
3 Test Points Functions ...................................................................................................... 5
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SLVU818–January 2013 Using the TPS92660EVM
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