2N3904

更新时间： 2024-11-20 06:20:03

品牌	Logo	应用领域
德州仪器 - TI		转换器
页数	文件大小	规格书
9页	206K
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High-Integration, High-Efficiency Power Solution Using DC/DC Converters With DVFS

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Application Report

SLVA340A–June 2009–Revised May 2010

High-Integration, High-Efficiency Power Solution Using

DC/DC Converters With DVFS

Ambreesh Tripathi .......................................................................... PMP - DC/DC Low-Power Converters

ABSTRACT

This reference design helps those desiring to design-in the TMS320C6742, TMS320C6746,

TMS320C6748 and OMAP-L138. This design, employing sequenced power supplies, describes a system

with an input voltage of 5V, and uses a high-efficiency DC/DC Converter with integrated FETs and DVFS

for a small, simple system.

Sequenced power supply architectures are becoming commonplace in high-performance microprocessor

and digital signal processor (DSP) systems. To save power and increase processing speeds, processor

cores have small-geometry cells that require lower supply voltages than the system-bus voltages. Power

management in these systems requires special attention. This application note addresses these topics

and suggests solutions for output-voltage sequencing.

Contents

Introduction .................................................................................................................. 1

Power Requirements ....................................................................................................... 2

Features ...................................................................................................................... 3

List of Material ............................................................................................................... 5

List of Figures

PMP4977 Reference Design Schematic.................................................................................

Optional circuit for DVDD_A, DVDD_B and DVDD_C .................................................................

Shows Sequencing in Start-Up Waveform ..............................................................................

DCDC1: Efficiency vs Output Current....................................................................................

DCDC2: Efficiency vs Output Current....................................................................................

DCDC3: Efficiency vs Output Current....................................................................................

List of Tables

PMP4977 List of Material ..................................................................................................

Introduction

In dual-voltage architectures, coordinated management of power supplies is necessary to avoid potential

problems and ensure reliable performance. Power supply designers must consider the timing and voltage

differences between core and I/O voltage supplies during power-up and power-down operations.

Sequencing refers to the order, timing and differential in which the two voltage rails are powered up and

down. A system designed without proper sequencing may be at risk for two types of failures. The first of

these represents a threat to the long term reliability of the dual-voltage device, while the second is more

immediate, with the possibility of damaging interface circuits in the processor or system devices such as

memory, logic or data-converter ICs.

I²C is a trademark of Philips Electronics N.V. Corporation.

SLVA340A–June 2009–Revised May 2010

High-Integration, High-Efficiency Power Solution Using DC/DC Converters With

DVFS

12 3 4 5 6 7...9

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与2N3904相关器件

型号	品牌	获取价格	描述	数据表
2N3904/D10Z	TI	获取价格	200mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92
2N3904/D10Z-5	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D10Z-J25Z	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D10Z-J61Z	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D11Z	TI	获取价格	200mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92
2N3904/D11Z-18	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D11Z-J14Z	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D11Z-J22Z	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D11Z-J61Z	TI	获取价格	40V, NPN, Si, SMALL SIGNAL TRANSISTOR, PLASTIC PACKAGE-3
2N3904/D26Z	TI	获取价格	200mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92

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