SAN3020 Просмотр технического описания (PDF) - South African Micro Electronic Systems

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SAN3020

SINGLE CHIP TELEPHONE POWER EXTRACTION FOR EXTERNAL LOADS

South African Micro Electronic Systems 

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SAN3020

APPLICATION NOTE

SINGLE CHIP TELEPHONE POWER

EXTRACTION FOR EXTERNAL LOADS

1 Scope

This application note describes a simple add-on circuit for extracting current to supply external loads. It also

includes hardware description ,schematic and Vout/Iout curves.

2 Key Features

• Only few additional low-cost components necessary

• Can drive line currents up to ILine-5mA (=15mA for 20mA line current)

• No influence in AC impedance or DC mask even when load is short circuited

Table of Contents

1 SCOPE.............................................................................................................................................................................................................1

2 KEY FEATURES ..............................................................................................................................................................................................1

3 OTHER APPLICABLE DOCUMENTS AND PAPERS ......................................................................................................................................1

4 REVISION STATUS .........................................................................................................................................................................................1

5 GENERAL DESCRIPTION ...............................................................................................................................................................................1

6 HARDWARE CONFIGURATION ......................................................................................................................................................................2

7 CIRCUIT DESCRIPTION ..................................................................................................................................................................................2

8 CONNECTING LOADS AT VDD ........................................................................................................................................................................2

9 APPLICATION SCHEMATIC............................................................................................................................................................................3

10 LIABILITY AND COPYRIGHT STATEMENT ..................................................................................................................................................4

3 Other applicable documents and papers

1. Data Sheet SA2531, SA2532

2. Pin-out comparison SA2531/2

4 Revision status

SAN3020 Application Note (this document)

AN3020 Schematic

Rev. B00

5 General description

Note: all further component references apply to the schematic shown in pt.9 of this application note !

SAN3020

PDS038-SA2531/2-002 Rev. B 21-03-00

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