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Introduction

1 Introduction

This EVM utilizes TI’s TPS51220A in a dual output design. It includes many test points to help the

engineer monitor and evaluate the control characteristics of the TPS51220A. The TPS51220A is a dual

peak current mode synchronous buck controller with three linear regulators. The EVM also allows the

engineer to configure several of the features of the TPS51220A controller.

2 Description

The TPS51220A EVM-476 provides two 8-A outputs, 3.3 V and 5 V. It accepts an input voltage from 8 V

to 20 V. Several jumpers and switches allow the user to evaluate various control functions of the

TPS51220A. Switches provide an easy method to enable and disable the EVM or each of the two outputs

independently. Two jumper blocks allow the user to select the mode of operation of each output. One

jumper block allows the engineer to select the control architecture and OVP function. And one block

allows for selection of over current trip level and if the output is discharged by the converter. See sections

below for more details.

2.1 Typical Applications

• Notebook Computers and I/O Bus

• Point-of-load in such Applications as Digital TV and Multi-Function Printers

2.2 Features

• Input Range from 8 V to 20 V

• Dual 8-A Outputs, 3.3 V and 5 V

• Individual Enable Function for 3.3-V and 5-V Output

• Selectable Light Load Operation

• Selectable Control Architecture

• Inductor Current Sensing

• OVP Disable Function

• Output Discharge Disable Function

• Test Points for Easy Access to Measure Key Parameters

SLUU381A–September 2009–Revised May 2011 High Performance Dual Output Synchronous Buck EVM

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