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Philips TFA9843AJ User Manual

Philips TFA9843AJ
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1. General description
The TFA9843AJ contains two identical audio power amplifiers. The TFA9843AJ can be
used as two Single-Ended (SE) channels with a volume control. The maximum gain is
26 dB.
The TFA9843AJ comes in a 9-pin DIL-bent-SIL (DBS9P) power package. The TFA9843AJ
is pin compatible with the TFA9842AJ, TFA9843(B)J, TFA9842(B)J and TFA9841J. The
difference between the TFA9843AJ and the TFA9843(B)J, TFA9842(B)J, TFA9841J is the
functionality of pin 7. The TFA9843AJ has a volume control on pin 7 (VC). The
TFA9843(B)J, TFA9842(B)J and TFA9841J have a mode select on pin 7 (MODE).
The TFA9843AJ contains a unique protection circuit that is solely based on multiple
temperature measurements inside the chip. This gives maximum output power for all
supply voltages and load conditions with no unnecessary audio holes. Almost any supply
voltage and load impedance combination can be made as long as thermal boundary
conditions (number of channels used, external heatsink and ambient temperature) allow
it.
2. Features
n 2 channel SE: 1 W to 20 W operation possibility
n Soft clipping
n Input clamps
n Volume control
n Standby and Mute mode
n No on or off switching plops
n Low standby current
n High supply voltage ripple rejection
n Outputs short-circuit protected to ground, supply and across the load
n Thermally protected
n Pin compatible with the TFA9842AJ, TFA9843(B)J, TFA9842(B)J, TFA9841J
3. Applications
n CRT TV and LCD TV
n Monitors
n PC speakers
n Boom box
n Mini and micro audio receivers
TFA9843AJ
20 W stereo power amplifier with volume control
Rev. 01 — 28 April 2006 Preliminary data sheet
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Philips TFA9843AJ Specifications

General IconGeneral
BrandPhilips
ModelTFA9843AJ
CategoryAmplifier
LanguageEnglish

Summary

General Description

Product Overview

Details the TFA9843AJ as a 20W stereo power amplifier with volume control, its package and pin compatibility.

Features

Audio Amplifier Capabilities

Lists features such as 2-channel SE operation, soft clipping, input clamps, volume control, and mute/standby modes.

Performance and Protection

Includes low standby current, high supply voltage ripple rejection, and output short-circuit/thermal protection.

Applications

Target Applications

Lists common applications including CRT TV, monitors, PC speakers, boom boxes, and mini audio receivers.

Quick Reference Data

Electrical Characteristics Summary

Presents key electrical parameters like supply voltage, quiescent current, output power, THD, voltage gain, and SVRR.

Ordering Information

Part Number and Package

Specifies the type number TFA9843AJ, package DBS9P, and its description.

Block Diagram

Functional Block Diagram

Illustrates the internal blocks of the TFA9843AJ, including inputs, outputs, volume control, and protection circuits.

Pinning Information

Pin Configuration

Shows the physical pin arrangement of the TFA9843AJ IC.

Pin Description

Details the function of each pin (IN1, IN2, OUT1, OUT2, CIV, VC, SVR, GND, Vcc) of the TFA9843AJ.

Functional Description

Input Configuration

Describes the input cut-off frequency calculation and input clamping behavior.

Power Amplifier Operation

Details the single-ended amplifier, output stage, peak output current, and measurement of output power.

Headroom and Music Power

Discusses dynamic headroom requirements for music and power dissipation for heatsink calculations.

Mode Selection

Explains the four functional modes (Standby, Mute, Volume control, On) selectable via the VC pin.

Supply Voltage Ripple Rejection

Details the SVRR measurement and the effect of capacitor selection on ripple rejection.

Built-in Protection Circuits

Describes temperature sensors and protection mechanisms against short-circuits and overheating.

Limiting Values

Absolute Maximum Ratings

Lists the absolute maximum limits for supply voltage, input voltage, current, and temperature.

Thermal Characteristics

Thermal Resistance

Provides thermal resistance values (junction-to-ambient, junction-to-case) for package thermal analysis.

Static Characteristics

DC Electrical Parameters

Details static characteristics like supply voltage, currents, input/output voltages, and input current.

Dynamic Characteristics

AC Performance Metrics

Lists dynamic parameters such as output power, THD, voltage gain, input impedance, noise, and SVRR.

Application Information

Application Diagrams

Presents circuit diagrams for typical applications and important remarks.

Single-ended Application Circuit

Shows the schematic for a single-ended application, including component values and connections.

Volume Control Drive Options

Illustrates different circuits for driving the volume control (VC) pin using PWM or potentiometers.

Printed-Circuit Board

Layout and Grounding

Provides essential grounding techniques for optimal system performance and signal integrity.

Power Supply Decoupling

Explains the importance of supply bypassing for low noise and ripple rejection.

Thermal Behavior and Heatsink Calculation

Heatsink Calculation Guide

Details thermal resistance and provides a method for calculating heatsink requirements for various operating conditions.

Test Information

Quality Information

States the applicable quality specification for integrated circuits.

Package Outline

DBS9P Package Dimensions

Provides detailed mechanical dimensions and references for the DBS9P package.

Soldering

Soldering Methods Overview

Introduces wave, dip, and manual soldering techniques for through-hole mount packages.

Wave and Dip Soldering

Discusses lead-free solder paste trends and dwell times for wave/dip soldering.

Manual Soldering Guidelines

Provides instructions for manual soldering with an iron, including temperature and contact time limits.

Package Soldering Suitability

Details the suitability of different package types for dipping and wave soldering methods.

Revision History

Revision History Log

Tracks changes and release dates for the document, starting from its preliminary status.

Legal Information

Data Sheet Status

Defines the status of the document (objective, preliminary, product) and product status.

Definitions

Explains terms like 'Draft' and 'Short data sheet' used within the document.

Disclaimers

Covers general disclaimers, right to change, suitability for use, applications, limiting values, and terms of sale.

Trademarks

Lists referenced brands, product names, and trademarks.

Contact Information

Further Information and Support

Provides website links for product information and email addresses for sales offices.

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