Datasheet

User's Guide
SLVU813A–November 2012–Revised June 2013
Using the TPS92075 Buck-Boost Converter
The TPS92075EVM is a 17-W maximum, 120-VAC non-isolated dimmable LED driver. The
TPS92075EVM implements a dimming solution using the TPS92075 integrated circuit from Texas
Instruments. This user's guide provides electrical specifications, performance data, typical characteristic
curves, schematics, printed-circuit board layout, and a bill of materials.
Contents
1 Introduction .................................................................................................................. 2
2 Description ................................................................................................................... 2
2.1 Typical Applications ................................................................................................ 2
2.2 TPS92075 Features ............................................................................................... 2
3 Electrical Performance Specifications .................................................................................... 3
4 Schematic .................................................................................................................... 3
5 Performance Data and Typical Characteristic Curves – Configured as Buck-Boost ............................... 4
5.1 Efficiency ............................................................................................................ 4
5.2 Load Regulation .................................................................................................... 5
5.3 Output Ripple ....................................................................................................... 5
5.4 Turn On Waveform ................................................................................................ 6
5.5 Turn Off Waveform ................................................................................................ 6
5.6 Dimming – Lutron Triac Dimmer at One Position .............................................................. 7
5.7 Dimming – Leviton Triac Dimmer at One Position ............................................................. 7
5.8 Thermal Scans ..................................................................................................... 8
5.9 EMI Scan – 9 LEDs ................................................................................................ 8
5.10 Dimmer Testing ................................................................................................... 10
6 Reference Design, Assembly Drawing, PCB layout, and Bill of Materials ......................................... 11
6.1 Reference Design, Assembly Drawing and PCB layout ..................................................... 11
6.2 Bill of Materials .................................................................................................... 13
Appendix A Table Data – Buck-Boost Configuration ....................................................................... 14
Appendix B Table Data – Buck Configuration. (Exchange Diode and Inductor, Reverse Bulk Cap Polarity) Efficiency
Calculated using Pout = Vout × Iout ........................................................................... 16
Appendix C Connection Snap-Shot ........................................................................................... 17
List of Figures
1 TPS92075 Buck-Boost Schematic ....................................................................................... 3
2 Dimming Wiring Diagram .................................................................................................. 4
3 TPS92075 Buck-Boost Efficiency (Input and Output Power Meter Used)........................................... 4
4 TPS92075 Buck-Boost Regulation ....................................................................................... 5
5 Output Ripple (Vout: 35.5 V, Iout 375 mA, THD 18.5%)............................................................... 5
6 Enable Turn On Waveform – Turn On Time ~64 ms................................................................... 6
7 Enable Turn Off Waveform ................................................................................................ 6
8 Lutron Leading Edge, Output = 100 mA ................................................................................. 7
9 Leviton Leading Edge, Output = 20 mA.................................................................................. 7
10 Thermal Scans .............................................................................................................. 8
11 Conducted EMI Scan, 9 LEDs ............................................................................................ 8
12 Typical Top Overall View ................................................................................................. 11
13 TPS92075 Buck-Boost Top (left) and Bottom (right) Layer Assembly Drawing................................... 11
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SLVU813A–November 2012–Revised June 2013 Using the TPS92075 Buck-Boost Converter
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