Texas Instruments 8-14V Vin, 1.8V Vout Synchronous Buck Converter Evaluation Module for TPS40305 TPS40305EVM-488 TPS40305EVM-488 Scheda Tecnica
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TPS40305EVM-488
User's Guide
SLUU406 – February 2010
TPS40305EVM-488
The TPS40305EVM-488 evaluation module (EVM) is a synchronous buck converter providing a fixed
1.8-V output at up to 10A from a 12-V input bus. The EVM is designed to start-up from a single supply; so,
no additional bias voltage is required for start-up. The module uses the TPS40305 high performance,
mid-input voltage synchronous buck controller and TI’s NexFET™ high performance MOSFETs.
1.8-V output at up to 10A from a 12-V input bus. The EVM is designed to start-up from a single supply; so,
no additional bias voltage is required for start-up. The module uses the TPS40305 high performance,
mid-input voltage synchronous buck controller and TI’s NexFET™ high performance MOSFETs.
Contents
1
Description
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1.1
Applications
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1.2
Features
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2
TPS40305EVM-488 Electrical Performance Specifications
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3
TPS40305EVM-488 Schematic
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4
Connector and Test Point Descriptions
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4.1
Enable Jumper (JP2)
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4.2
Frequency Spread Spectrum – FSS Jumper (JP1)
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4.3
Test Point Descriptions
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5
Test Set Up
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5.1
Equipment
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5.2
Equipment Setup
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5.3
Start Up/Shut Down Procedure
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5.4
Output Ripple Voltage Measurement Procedure
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5.5
Control Loop Gain and Phase Measurement Procedure
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5.6
Equipment Shutdown
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6
TPS40305EVM-488 Test Data
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6.1
Efficiency
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6.2
Line and Load Regulation
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6.3
Output Voltage Ripple
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6.4
Switch Node
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6.5
Control Loop Bode Diagram
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6.6
Additional Waveforms
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7
TPS40305EVM-488 Assembly Drawings and Layout
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8
TPS40305EVM-488 Bill of Materials
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List of Figures
1
TPS40305EVM-488 Schematic
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2
TPS40305EVM-488 Recommended Test Set-Up
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3
Output Ripple Measurement – Tip and Barrel using TP3 and TP4
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4
Control Loop Measurement Setup
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5
TPS40305EVM-488 Efficiency vs Load Current
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6
TPS40305EVM-488 Output Voltage vs Load Current
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7
TPS40305EVM-488 Output Voltage Ripple
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8
TPS40305EVM-488 Switching Waveforms
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9
TPS40305EVM-488 Gain and Phase vs. Frequency
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10
TPS40305EVM-488 Output Ripple with FSS Enabled
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11
TPS40305EVM-488 Top Component Placement (Top View)
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NexFET is a trademark of Texas Instruments.
1
SLUU406 – February 2010
TPS40305EVM-488
Copyright © 2010, Texas Instruments Incorporated