Texas Instruments TPS40100 User Manual

Using the TPS40100
A 12V Input, 3.3V Output, 10A Synchronous Buck Controller
System Power Management – DC/DC Controllers
1 INTRODUCTION
The TPS40100EVM-001 evaluation module (EVM) is a synchronous buck converter providing a fixed 3.3V output
at up to 10A from a 12V input bus. The EVM is designed to start up from a single input supply, with no additional
bias voltage required. The module uses a TPS40100 midrange input synchronous buck controller.
2 DESCRIPTION
TPS40100EVM-001 is designed to use a regulated 12V +/-10% (10.8V-13.2V) bus to produce a regulated 3.3V
output at up to 10A of load current. The EVM is designed to demonstrate the TPS40100 in a typical regulated
bus to low-voltage application while providing a number of test points to evaluate the performance of the
TPS40100. The EVM includes features to demonstrate voltage tracking, margin up/down, enable/disable and
power good. A synchronization pin is provided to allow the EVM to be synchronized to an external clock.
2.1 APPLICATIONS
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Non-Isolated Medium Current Point of Load and low voltage bus converters.
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Merchant Power Modules
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Networking Equipment
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Telecommunications Equipment
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DC Power Distributed Systems
2.2 FEATURES
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10.8V – 13.2V input range
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3.3V fixed output
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10 Adc Steady State Output Current
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Output margin up and down support
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Tracking voltage input to support simultaneous sequencing
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Power good indicator
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Frequency synchronization input
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Remote sensing scheme
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380kHz switching frequency
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Single Main Switch MOSFET and Single Synchronous Rectifier MOSFET
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Single Component Side, surface mount design on a 3.0" x 3.25" evaluation board
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Four Layer PCB with all components on top side
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Convenient test points for probing critical waveforms
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Test points for full loop analysis as well as control to output
2.2.1 USING REMOTE SENSE (J3)
TPS40100EVM-001 provides the user with remote sense capabilities. Remote sense is used to provide more
accurate load regulation by compensating for losses over terminal connections and load wire resistance.
When remote sense is used properly, the converter will regulate the voltage at the point where sense connections
are placed. These remote sense connections are usually placed at the intended load. As the load is increased
the direct output of the converter will rise to compensate for IR losses.
1
User Guide
SLUU224 – JUNE 2005