NXP Semiconductors TDA8948J Product Data Sheet
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NXP Semiconductors TDA8948J Product Data Sheet

4-channel audio amplifier
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1. General description

2. Features

2.1 Functional features

3. Applications

TDA8948J
4-channel audio amplifier
Rev. 01 — 27 February 2008
The TDA8948J contains four identical audio power amplifiers. The TDA8948J can be used
as four Single-Ended (SE) channels with a fixed gain of 26 dB, two times Bridge-Tied
Load (BTL) channels with a fixed gain of 32 dB or two times SE channels (26 dB gain)
plus one BTL channel (32 dB gain) operating as a 2.1 system.
The TDA8948J comes in a 17-pin Dil-Bent-Sil (DBS) power package. The TDA8948J is
pin compatible with the TDA8944AJ, TDA8946AJ and TDA8947J.
The TDA8948J 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 heat sink and ambient temperature) allow
it.
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SE: 1 W to 18 W, BTL: 4 W to 36 W operation possibility (2.1 system)
Soft clipping.
I
Standby and mute mode.
I
No on/off switching plops.
I
Low standby current.
I
High supply voltage ripple rejection.
I
Outputs short-circuit protected to ground, supply and across the load.
I
Thermally protected.
I
Pin compatible with TDA8944AJ, TDA8946AJ and TDA8947J.
I
Television
I
PC speakers
I
Boom box
I
Mini and micro audio receivers
Product data sheet

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Summary of Contents for NXP Semiconductors TDA8948J

  • Page 1: General Description

    Product data sheet 1. General description The TDA8948J contains four identical audio power amplifiers. The TDA8948J can be used as four Single-Ended (SE) channels with a fixed gain of 26 dB, two times Bridge-Tied Load (BTL) channels with a fixed gain of 32 dB or two times SE channels (26 dB gain) plus one BTL channel (32 dB gain) operating as a 2.1 system.

  • Page 2: Quick Reference Data

    TDA8948J NXP Semiconductors 4-channel audio amplifier 4. Quick reference data Table 1. Quick reference data = 25 ° C; R = 4 Ω ; f SE: V = 17 V; T = 1 kHz; V ; measured in test MODE1...

  • Page 3: Ordering Information

    TDA8948J NXP Semiconductors 4-channel audio amplifier = 0 Ω at the Supply voltage ripple rejection is measured at the output with a source impedance R SOURCE input and with a frequency range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with a frequency f and an amplitude of 300 mV (RMS), which is applied to the positive supply rail.

  • Page 4: Pinning Information

    TDA8948J NXP Semiconductors 4-channel audio amplifier 7. Pinning information 7.1 Pinning OUT1 + GND1 OUT2 − MODE2 IN2 + SGND IN1 + IN3 + TDA8948J MODE1 IN4 + OUT3 − GND2 OUT4 + 010aaa046 Fig 2. Pin configuration diagram 7.2 Pin description Table 3.

  • Page 5: Functional Description

    The power amplifier is a BTL and/or SE amplifier with an all-NPN output stage, capable of delivering a peak output current of 4 A. Using the TDA8948J as a BTL amplifier offers the following advantages: • Low peak value of the supply current •...

  • Page 6: Output Power Measurement

    For heat sink calculation at the average listening level, a power dissipation of 9 W can be used. 8.3 Mode selection The TDA8948J has three functional modes which can be selected by applying the proper DC voltage to pin MODE1. Standby - The current consumption is very low and the outputs are floating. The device is in standby mode when V <...

  • Page 7: Supply Voltage Ripple Rejection

    TDA8948J NXP Semiconductors 4-channel audio amplifier On - The amplifier is operating normally. The on mode is activated at − 2.0 V). The output of channels 3 and 4 can be set to mute or on mode. > (V MODE1...

  • Page 8: Built-In Protection Circuits

    After this time period the power stages switch on automatically and the detection will take place again; still a too high temperature switches off the power stages immediately. This protects the TDA8948J against shorts to ground, to the supply voltage and across the load, and against too high chip temperatures.

  • Page 9: Static Characteristics

    TDA8948J NXP Semiconductors 4-channel audio amplifier 11. Static characteristics Table 8. Static characteristics = 25 ° C; R = 8 Ω ; V = 17 V; T = 0 V; measured in test circuit Figure 11; unless MODE1 MODE2 otherwise specified.
  • Page 10 TDA8948J NXP Semiconductors 4-channel audio amplifier Table 9. Dynamic characteristics SE …continued = 25 ° C; R = 4 Ω ; f = 17 V; T = 1 kHz; V ; measured in test circuit Figure 11; unless MODE1 MODE2 otherwise specified.
  • Page 11 TDA8948J NXP Semiconductors 4-channel audio amplifier coc005 (µV) MODE1 a. BTL; V = 17 V; V = 50 mV. Fig 4. AC output voltage as a function of voltage on pin MODE1 010aaa111 010aaa112 o(max) o(max) =1 kHz = 1 kHz (1) 1 Ω...
  • Page 12 TDA8948J NXP Semiconductors 4-channel audio amplifier mce488 mce487 THD + N THD + N −1 −1 −2 −2 −1 −1 = 4 Ω. = 8 Ω. = 17 V; f = 1 kHz; R = 17 V; f = 1 kHz; R a.
  • Page 13 TDA8948J NXP Semiconductors 4-channel audio amplifier 010aaa430 010aaa432 Ptot = 4 Ω. = 8 Ω. = 17 V; R = 17 V; R a. SE b. BTL Fig 8. Total power dissipation as a function of channel output power per channel...
  • Page 14 TDA8948J NXP Semiconductors 4-channel audio amplifier mce497 mce498 SVRR SVRR (dB) (dB) −20 −20 −40 −40 −60 −60 −80 −80 f (Hz) f (Hz) = 0 Ω; V = 0 Ω; V = 17 V; R = 300 mV (RMS).

  • Page 15: Application Information

    TDA8948J NXP Semiconductors 4-channel audio amplifier 13. Application information 13.1 Application diagrams 1000 µF 100 nF 220 nF OUT1+ IN1+ 60 kΩ R L 4 Ω − 220 nF IN2+ OUT2− − − R L 4 Ω 60 kΩ IN3+ OUT3−...
  • Page 16 TDA8948J NXP Semiconductors 4-channel audio amplifier 1000 µF 100 nF 220 nF OUT1+ IN1+ 60 kΩ R L 4 Ω − 220 nF IN2+ OUT2− − − R L 4 Ω 60 kΩ IN3+ OUT3− − 470 µF − 470 nF 60 kΩ...

  • Page 17: Printed-Circuit Board

    TDA8948J NXP Semiconductors 4-channel audio amplifier 13.2 Printed-circuit board 13.2.1 Layout and grounding To obtain a high-level system performance, certain grounding techniques are essential. The input reference grounds have to be tied with their respective source grounds and must have separate tracks from the power ground tracks; this will prevent the large (output) signal currents from interfering with the small AC input signals.

  • Page 18: Thermal Behavior And Heat Sink Calculation

    TDA8948J NXP Semiconductors 4-channel audio amplifier 13.3 Thermal behavior and heat sink calculation The measured maximum thermal resistance of the IC package, R , is 1.3 K/W. th(j-mb) A calculation for the heat sink can be made, with the following parameters: = 60 °C (example)

  • Page 19: Test Information

    TDA8948J NXP Semiconductors 4-channel audio amplifier mce499 mce500 (˚C ) (˚C ) = 25 °C; external heat sink of 4.3 K/W. = 25 °C; external heat sink of 4.3 K/W. = 1 Ω. = 2 Ω. (1) R (1) R = 2 Ω.

  • Page 20: Package Outline

    TDA8948J NXP Semiconductors 4-channel audio amplifier 15. Package outline DBS17P: plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1 non-concave view B: mounting base side 10 mm scale DIMENSIONS (mm are the original dimensions) UNIT 17.0 0.75 0.48 24.0...

  • Page 21: Soldering Of Smd Packages

    TDA8948J NXP Semiconductors 4-channel audio amplifier 16. Soldering of SMD packages This text provides a very brief insight into a complex technology. A more in-depth account of soldering ICs can be found in Application Note AN10365 “Surface mount reflow soldering description” .

  • Page 22: Reflow Soldering

    TDA8948J NXP Semiconductors 4-channel audio amplifier 16.4 Reflow soldering Key characteristics in reflow soldering are: • Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see Figure 16) than a SnPb process, thus reducing the process window •...
  • Page 23 TDA8948J NXP Semiconductors 4-channel audio amplifier maximum peak temperature = MSL limit, damage level temperature minimum peak temperature = minimum soldering temperature peak temperature time 001aac844 MSL: Moisture Sensitivity Level Fig 16. Temperature profiles for large and small components For further information on temperature profiles, refer to Application Note AN10365 “Surface mount reflow soldering description”...

  • Page 24: Revision History

    TDA8948J NXP Semiconductors 4-channel audio amplifier 17. Revision history Table 14. Revision history Document ID Release date Data sheet status Change notice Supersedes TDA8948J_1 20080227 Product data sheet TDA8948J_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 27 February 2008...

  • Page 25: Legal Information

    For detailed and full information see the relevant full data the Absolute Maximum Ratings System of IEC 60134) may cause permanent sheet, which is available on request via the local NXP Semiconductors sales damage to the device. Limiting values are stress ratings only and operation of office.

  • Page 26: Table Of Contents

    TDA8948J NXP Semiconductors 4-channel audio amplifier 20. Contents General description ..... . 1 Features ....... 1 Functional features .

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