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AN45

更新时间： 2024-02-08 16:56:50

品牌	Logo	应用领域
芯科 - SILICON		转换器电容器 DC-DC转换器
页数	文件大小	规格书
14页	220K
描述
DESIGN GUIDE FOR THE Si3210/15/16 DC-DC CONVERTER

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AN45 技术参数

生命周期：	Obsolete	包装说明：	, 1825
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8532.24.0020	风险等级：	5.7
Is Samacsys：	N	电容器类型：	CERAMIC CAPACITOR
介电材料：	CERAMIC	安装特点：	SURFACE MOUNT
多层：	Yes	端子数量：	2
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装形状：	RECTANGULAR PACKAGE	包装方法：	TAPE; BULK
参考标准：	CECC32101-801	尺寸代码：	1825
表面贴装：	YES	端子形状：	WRAPAROUND
Base Number Matches：	1

AN45 数据手册

AN45

DESIGN GUIDE FOR THE Si3210/15/16 DC-DC CONVERTER

Introduction

The ProSLIC® from Silicon Laboratories integrates a requirements and selecting component values for each

complete analog telephone interface into one of the dc-dc converter architectures.

low-voltage CMOS device and offers extensive software

Si321x DC-DC Converter Description

programmability to meet many global telephony

requirements and customer specifications. In addition to The dc-dc converter dynamically generates the large

performing all BORSCHT functions, the Si321x also negative voltages required to operate the linefeed

dynamically generates and controls its own battery interface. The Si321x acts as the controller for a

voltage, eliminating the need for external battery buck-boost dc-dc converter that converts a positive dc

supplies. Two different battery generation architectures voltage into the desired negative battery voltage. In

are supported: a BJT/inductor design offering a low-cost addition to eliminating external power supplies, this

battery supply solution, and a MOSFET/transformer allows the Si321x to minimize power dissipation by

design offering increased power efficiency and a wider dynamically controlling the battery voltage to the

range of input voltages. This application note gives minimum required for any given mode of operation.

specific guidance in determining dc-dc converter power

Twisted

Telephone

Pair Line

R_LINE

Hook SW.

Input

Output

TIP

DC-DC

Converter

V_DC

V_BAT

–

V_TR

–

R_LINE

RING

Linefeed Circuitry

Ringer

RDC

Figure 1. Linefeed Power Diagram

in parallel to the TIP and RING lines, the equivalent

impedance of the parallel ringers can be computed as

the following (NREN is limited to 1 to 5):

Power Output Requirement

Understanding the maximum power required by the

ProSLIC linefeed circuitry to operate a worst-case

specified load is the first step in determining the dc-dc

converter design solution. Figure 1 defines the linefeed

circuit and load circuit in basic blocks of circuitry.

7000

-----------------

R_NREN

NREN

During ringing, the TIP-to-RING peak voltage, V

TR_PK

Typically, the ringing state is the highest power

consumption state for the SLIC, but in special cases the

off-hook state can have the highest. Guidance in

calculating each of these states is offered in this

section.

is the sum of the rms voltage drop across the ringer

circuit, V , the line resistance, and the internal

RINGrms

source resistance of 160 Ω.

V_RINGrms

× 2

7000

NREN







---------------------------------------

-----------------

The ringer impedance of one telephone is defined as an

8 µF cap in series with a 6930 Ω resistor. This is

approximately the same impedance as 7000 Ω at 20 Hz

and is defined as 1 REN (ringing equivalence number).

Since there can be N number of telephones connected

V_{TR_PK}

+ R_LINE+ R_s



7000 ⁄ NREN

Rev. 0.5 7/03

AN45-050

12 3 4 5 6 7...14

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