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FEATURES

APPLICATIONS

DESCRIPTION

PTB48560A, PTB48560B

PTB48560C

SLTS236A–MARCH 2005–REVISED OCTOBER 2005

30-W, 48-V INPUT DC/DC CONVERTERS

WITH AUTO-TRACK™ SEQUENCING

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Intermediate Bus Architectures

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Input Voltage: 36 V to 75 V

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Telecom, High-End Computing Platforms

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30-W Total Output Power

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Multi-Rail Power Systems with

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Output Voltages: 3.3 V, 5 V, and 12 V

Power-Up Sequencing

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Wide-Output Adjust/Trim

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Up To 88% Efficiency

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Overcurrent Protection

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Overtemperature Shutdown

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Undervoltage Lockout

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Input Overvoltage Protection

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Auto-Track™ Power-Up Sequencing

(Includes Sequenced Output with PTB48560B)

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Smart-Sense Remote Sensing (PTB48560B)

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Dual-Logic Enable Control

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Space-Saving 1×2 Footprint

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Surface Mount Package

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1500-Vdc Isolation

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Agency Approvals (Pending):

UL/cUL 60950, EN 60950

The PTB48560x is a series of 30–W rated isolated dc/dc converters, designed to operate from a standard -48–V

telecom central office (CO) supply. Housed in a 1×2 package, each model has a wide-adjust output voltage that

can be set to one of the common intermediate bus voltages of 3.3 V, 5 V, or 12 V.

The PTB48560 series incorporates Auto-Track™, a feature that simplifies the power-up sequencing of multiple

power modules and operates from the same intermediate bus. During a power-up cycle, modules with this

feature have the capability of following a common ramp voltage applied to an input called Track. The PTB48560

series is specifically designed to control the Track voltage of any number of nonisolated downstream modules

powered from its output. This ensures that the outputs of the downstream modules all rise simultaneously during

under the control of Auto-Track.

Whether used to facilitate power-up sequencing, or operated as a stand-alone module, the PTB48560 series

includes many other features expected of high-performance dc/dc converter modules. Precise output voltage

regulation is ensured with a differential remote sense. Operational features include an input undervoltage lockout

(UVLO) and a dual-logic output enable control. Overcurrent and overtemperature protection ensure survival

against load faults.Typical applications include distributed power architectures in both telecom and computing

environments, particularly complex digital systems requiring power sequencing of multiple power supply rails.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Auto-Track is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.