Datasheet

User's Guide

SLVU638– January 2012

Using the PWR091EVM Dual-Output DC/DC Analog With

PMBus Interface

The PWR091EVM evaluation module uses the TPS40422. The TPS40422 is a dual-channel, synchronous

buck controller that operates from a nominal 4.5-V to 20-V supply. This controller is an analog PWM

controller that allows programming and monitoring via the PMBus interface. It can be used as a dual,

independent output or a dual-phase output controller.

1 Description

The PWR091EVM is designed as a dual-output converter. It uses a nominal 12-V bus to produce a

regulated 1.2-V output at up to 20 A of load current, and a regulated 3.3-V output at up to 15 A of load

current. The PWR091EVM demonstrates the TPS40422 in a typical low-voltage application while providing

a number of test points to evaluate the performance of the TPS40422.

1.1 Typical Applications

• Smart power systems

• Power supply modules

• Communications equipment

• Computing equipment

1.2 Features

• Regulated 1.2-V output up to 20-Adc, steady-state output current

• Regulated 3.3-V output up to 15-Adc, steady-state output current

• Both outputs are marginable and trimmable via the PMBus interface.

– Programmable: UVLO, Soft Start, and Enable via the PMBus interface

– Programmable overcurrent warning and fault limits and programmable response to faults via the

PMBus interface

– Programmable overvoltage warning and fault limit and programmable response to faults via the

PMBus interface

– Programmable high- and low-output margin voltages with a maximum range of +10%, –20% of

nominal output voltage

• Convenient test points for probing critical waveforms

SLVU638–January 2012 Using the PWR091EVM Dual-Output DC/DC Analog With PMBus Interface

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