Texas Instruments TPS54291EVM-431, User Manual

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User's Guide
SLVU356 – January 2010
Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and
1.2V 2.5A Synchronous Buck Converter
Contents
1 Introduction
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2
1.1 Description
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2
1.2 Applications
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2
1.3 Features
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2 TPS54291EVM-431 Electrical Performance Specifications
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3 Schematic
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3.1 Enable Jumpers (JP1 and JP2)
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3.2 Error Amplifier Outputs
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3.3 Test Point Descriptions
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4 Test Set UP
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4.1 Equipment
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4.2 Equipment Setup
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4.3 Start Up / Shut Down Procedure
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4.4 Output Ripple Voltage Measurement Procedure
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4.5 Control Loop Gain and Phase Measurement Procedure
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4.6 Equipment Shutdown
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5 TPS54291EVM-431 Typical Performance Data and Characteristic Curves
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5.1 Efficiency
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5.2 Line and Load Regulation
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5.3 Switch Node and Output Ripple Voltage
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6 EVM Assembly Drawings and Layout
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7 List of Materials
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16
List of Figures
1 TPS54291EVM-431 Schematic (For Reference Only, See Table 4: Bill of Materials for Specific Values)
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4
2 TPS54291EVM-431 Recommended Test Set-Up
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3 Output Ripple Measurement – Tip and Barrel using TP3 and TP4 or TP18 and TP19
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4 Control Loop Measurement Setup
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5 TPS54291EVM-431 Efficiency vs Load Current
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6 TPS54291EVM-431 Output Voltage vs Load Current
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7 TPS54291EVM-431 Output Voltage Ripple
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8 TPS54291EVM-431 Component Placement (Viewed from Top)
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9 TPS54291EVM-431 Silkscreen (Viewed from Top)
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10 TPS54291EVM-431 Top Copper (Viewed from Top)
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11 TPS54291EVM-431 Bottom Copper (X-Ray View from Top)
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12 TPS54291EVM-431 Internal 1 (X-Ray View from Top)
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13 TPS54291EVM-431 Internal 2 (X-Ray View from Top)
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List of Tables
1 TPS54291EVM-431 Electrical and Performance Specifications
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3
1 SLVU356 – January 2010 Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and 1.2V 2.5A
Synchronous Buck Converter
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