Introduction
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Test Point Descriptions
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TPS54291EVM-431 Bill of Materials
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1
Introduction
The TPS54291EVM-431 evaluation module (EVM) is a dual synchronous buck converter providing fixed
3.3V and 1.2V outputs at up to 1.5A and 2.5A respectively from a 12V bus. The EVM is designed to
start-up from a single supply, so no additional bias voltages are require for start-up. The module uses the
TPS54291 600kHz Dual Synchronous Buck Converter with integral MOSETs.
1.1
Description
TPS54291EVM-431 is designed to use a regulated 12V (+10% /–20%) bus to produce two regulated
power rails, 3.3V at 1.5A and 1.2V at 2.5A. TPS54291EVM-431 is designed to demonstrate the TPS54291
in a typical 12-V bus system while providing a number of test points to evaluate the performance of the
TPS54291 in a given application. The EVM can be modified to other output voltages by changing some of
the components.
1.2
Applications
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Non-Isolated Point of Load and Voltage bus converters.
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Consumer Electronics
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LCD TV
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Computer Peripherals
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Digital Set Top Box
1.3
Features
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12 V +10% /–20% input range
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5.0 V and 3.3 V fixed output voltage, adjustable with resistor change
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1.5A (3.3V) and 2.5A (1.2V) Steady State Current
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600kHz switching frequency (Fixed by TPS54291)
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Internal switching MOSFET and external Rectifier Diode.
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Double Sided 2 Active Layer PCB with all components on top side (Test Point signals routed on
internal layers)
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Active Converter area of 1.1 square inches (0.86" × 1.28")
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Convenient test points for probing switching waveforms and non-invasive loop response testing
2
Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and 1.2V 2.5A
SLVU356 – January 2010
Synchronous Buck Converter
Copyright © 2010, Texas Instruments Incorporated