The TDA8933B is a high-efficiency class D amplifier with low power dissipation

TDA8933B

Manufacturer Part NumberTDA8933B
DescriptionThe TDA8933B is a high-efficiency class D amplifier with low power dissipation
ManufacturerNXP Semiconductors
TDA8933B datasheet
 


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TDA8933B
Class D audio amplifier
Rev. 01 — 23 October 2008
1. General description
The TDA8933B is a high-efficiency class D amplifier with low power dissipation.
The continuous time output power is 2
(R
= 8 ) or 1
L
dissipation the device can be used without any external heat sink when playing music.
Due to the implementation of Thermal Foldback (TF) the device remains operating with
considerable music output power without the need for an external heat sink, even for high
supply voltages and/or lower load impedances.
The device has two full differential inputs driving two independent outputs. It can be used
in a mono full-bridge configuration (Bridge-Tied Load (BTL)) or as stereo half-bridge
configuration (Single-Ended (SE)).
2. Features
I
Operating voltage from 10 V to 36 V asymmetrical or 5 V to 18 V symmetrical
I
Mono bridge-tied load (full-bridge) or stereo single-ended (half-bridge) application
I
Application without heat sink using thermally enhanced small outline package
I
High efficiency and low-power dissipation
I
Thermal foldback to avoid audio holes
I
Current limiting to avoid audio holes
I
Full short circuit proof across load and to supply lines (using advanced current
protection)
I
Internal or external oscillator (master-slave setting) that can be switched
I
No pop noise
I
Full differential inputs
3. Applications
I
Flat-panel television sets
I
Flat-panel monitor sets
I
Multimedia systems
I
Wireless speakers
I
Mini/micro systems
I
Home sound sets
10 W in a stereo half-bridge application
20 W in a mono full-bridge application (R
Preliminary data sheet
=16 ). Due to the low power
L

TDA8933B Summary of contents

  • Page 1

    ... TDA8933B Class D audio amplifier Rev. 01 — 23 October 2008 1. General description The TDA8933B is a high-efficiency class D amplifier with low power dissipation. The continuous time output power dissipation the device can be used without any external heat sink when playing music. ...

  • Page 2

    ... THD [1] < 0.1 s RMS output power continuous time output power THD THD Description body width 6.1 mm; lead pitch 0.65 mm; exposed die pad Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier Min Typ 0 [ kHz 7.5 8.5 i ...

  • Page 3

    ... Preliminary data sheet OSCIO 31 PWM MODULATOR MANAGER PWM MODULATOR UVP, TF, WP MODE TDA8933BTW 9 1, 16, 17 SSA SSD(HW) Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier V DDA 8 DRIVER HIGH CTRL DRIVER LOW DRIVER HIGH CTRL DRIVER LOW V DDA STABILIZER ...

  • Page 4

    ... V regulator for logic supply Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi SSD(HW) 31 OSCIO 30 ...

  • Page 5

    ... The exposed die pad has to be connected Functional description 8.1 General The TDA8933B is a mono full-bridge or stereo half-bridge audio power amplifier using class D technology. The audio input signal is converted into a PWM signal via an analog input stage and a PWM modulator. To enable the output power Diffusion Metal Oxide Semiconductor (DMOS) transistors to be driven, this digital PWM signal is applied to a control and handshake block and driver circuits for both the high side and low side ...

  • Page 6

    ... NXP Semiconductors 8.2 Mode selection and interfacing The TDA8933B can be switched to one of four operating modes using pins POWERUP and ENGAGE: • Sleep mode: with low supply current. • Mute mode: the amplifiers are switching to idle (50 % duty cycle), but the audio signal ...

  • Page 7

    ... Using an external resistor the carrier frequency is set to a typical value of 320 kHz (see If two or more TDA8933B devices are used in the same audio application recommended to synchronize the switching frequency of all devices. See more information ...

  • Page 8

    ... The behavior of the device under the different fault conditions differs according to the protection activated and is described in the following sections. 8.4.1 Thermal Foldback (FT) If the junction temperature of the TDA8933B exceeds the threshold level (T gain of the amplifier is decreased gradually to a level where the combination of dissipation (P) and the thermal resistance from junction to ambient (R junction temperature of around the threshold level ...

  • Page 9

    ... The timer will keep the power stage disabled for at least 100 ms. Every 100 ms the amplifier will try to restart as long as the short circuit between the loudspeaker terminals remains. The average power dissipation in the TDA8933B will be low because the short circuit current will flow only during a very short time every 100 ms. ...

  • Page 10

    ... TDA8933B is thus protected against any overstress. • supply voltage > caused by other or by external causes the TDA8933B will shut down, but the device can still be damaged since the supply voltage in this case will remain > The OVP protection is not a supply clamp. ...

  • Page 11

    ... Diagnostic output for different short circuit conditions IN1P IN1N audio input IN2P IN2N Input configuration for a mono BTL application Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi 2 restart 0 V short to supply line 001aad759 Figure Section 14 ...

  • Page 12

    ... Output voltage buffer pins: • Pins HVP1 and HVP2: The time required for charging the SE capacitor depends on its value. The half-supply voltage output is disabled when the TDA8933B is used in a symmetrical supply application. • Pin HVPREF: This output voltage reference buffer charges the capacitor on pin HVPREF. • ...

  • Page 13

    ... NXP Semiconductors Table 7. Pin TDA8933B_1 Preliminary data sheet Internal circuitry Symbol Equivalent circuit DIAG 4 ENGAGE 5 POWERUP CGND Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier V 2.5 V DDA 50 A 500 20 % 100 CGND SSA 001aaf607 V 2.8 V DDA I ref = ...

  • Page 14

    ... NXP Semiconductors Table 7. Pin TDA8933B_1 Preliminary data sheet Internal circuitry Symbol Equivalent circuit V DDA V SSA OSCREF HVPREF TEST Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi SSA V SSD 001aad790 V DDA 9 V SSD 001aad791 V DDA I ref 10 V 001aad792 ...

  • Page 15

    ... Preliminary data sheet Internal circuitry Symbol Equivalent circuit DREF HVP2 HVP1 V DDP2 V SSP2 V SSP1 V DDP1 BOOT2 BOOT1 OUT2 OUT1 Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi SSD 001aag025 V DDA 19 001aag026 SSA 20, 29 23, 26 001aad798 21, 28 OUT1, OUT2 001aad799 ...

  • Page 16

    ... SSP2 < SSD(HW) x < SSP1 SSP2 DD DDP1 DDP2 = 1500 ; C = 100 pF. For pins 2, 3, 11, 14 and Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier V DDA 24 SSP1, V SSP2 001aag028 DREF 31 V SSD 001aag029 Min 0.3 [1] [ ...

  • Page 17

    ... FR4 base material in free air with natural convection unless specified otherwise. Conditions asymmetrical supply symmetrical supply Sleep mode no snubbers or filter connected 125 Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier Min Typ Max [ [ [ ...

  • Page 18

    ... Mute mode reference to V SSA SE; with respect to HVPREF Mute mode Operating mode BTL Mute mode Operating mode Mute mode and Operating mode; with respect to pins V and SSP1 V SSP2 Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier Min Typ Max 2.4 2 0.8 2 ...

  • Page 19

    ... HVPREF HVPREF current limiting [2] driven by one master . Conditions osc range Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier Min Typ Max - - 2.0 2.5 - 155 - 160 140 - 150 4 0.8 4 ...

  • Page 20

    ... Mute mode Mute mode (RMS (RMS) i(cm W/channel W/channel o measurement. DSon Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi unless otherwise specified. amb Min Typ [2] 5.9 6.8 - 6.8 7.5 8.5 - 8.5 7.3 8.2 - 8.2 9.3 10.3 - 10.3 [3] - 0.014 - 0 ...

  • Page 21

    ... V (RMS (RMS) i(cm measurement. DSon at THD+N = 0.5 %, just before clipping, for the SE and the BTL o Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi unless otherwise specified. amb Min Typ [2] 11.9 13.7 - 13.7 15.4 17.1 - 17.1 14.9 16.5 - 16.5 18.9 20 ...

  • Page 22

    ... R at THD can be estimated by 1. 0.5% and Figure 8 show the estimated output power at THD+N = 0.5 % and = 0. 0.05 s ESR Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi – min osc – ...

  • Page 23

    ... Preliminary data sheet 010aaa499 P o (W/channel) (3) ( (V) P 010aaa501 P ( (W) ( (V) P Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi ( THD Section 8.4 (2) ...

  • Page 24

    ... Equivalent Series Resistance SE capacitance ( speaker in the BTL configuration can be used supply voltage Filter component values Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi (V) DDP2 SSP2 LC Table 14 shows the values required ...

  • Page 25

    ... cut-off frequency. Table 15. Impedance ( ) 14.5 Gain reduction The gain of the TDA8933B is internally fixed for SE and 36 dB for BTL. The gain can be reduced by a resistive voltage divider at the input (see Fig 9. When applying a resistive divider, the total voltage gain G Equation ...

  • Page 26

    ... G 14.6 Device synchronization If two or more TDA8933B devices are used in one application it is recommended that all the devices are synchronized at the same switching frequency to avoid beat tones. This can be done by connecting all OSCIO pins together and configuring one of the devices as master while the others are confi ...

  • Page 27

    ... T amb • power dissipation, which is determined by the efficiency of the TDA8933B The power dissipation is shown in Thermal foldback will limit the maximum junction temperature to 140 C. 14.8 Pumping effects When the amplifier is used configuration a so-called ‘pumping effect’ can occur. ...

  • Page 28

    ... Fig 12. Total harmonic distortion-plus-noise as a function of output power TDA8933B_1 Preliminary data sheet IN1P audio in1 IN1N IN2N audio in2 IN2P 010aaa503 THD+N (%) (W/channel Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier Figure OUT1 OUT2 010aaa140 ( (1) ( ...

  • Page 29

    ... SE 010aaa507 SVRR (dB (Hz 1000 F se Fig 15. Supply voltage ripple rejection as a function of Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi ( ...

  • Page 30

    ... P (W) o Fig 17. Channel separation as a function of frequency 010aaa511 ( (W/channel Fig 19. Power dissipation as a function of output Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi 100 ( ...

  • Page 31

    ... V (V) P Fig 21. Power dissipation as a function of supply 010aaa515 Operating 2 2 (V) POWERUP = 100 mV (RMS) i Fig 23. Output voltage as a function of voltage on pin Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier 4.0 P 3.0 (1) 2.0 1.0 0 kHz THD ...

  • Page 32

    ... V 010aaa519 2 10 THD+N (%) (Hz (1) P (2) P Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier 010aaa518 (1) (2) ( BTL P L 010aaa520 (1) ( (Hz ...

  • Page 33

    ... P (W) o Fig 27. Gain as a function of frequency 010aaa523 (W) (1) ( (W) o Fig 29. Power dissipation as a function of supply Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi 100 mV (RMS BTL ...

  • Page 34

    ... V (V) P (1) V (2) V Fig 31. Supply voltage ripple rejection as a function of Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier 010aaa526 (1) ( 500 mV (RMS) with relation to ground; ripple Shorted inputs 100 nF HVP = 17 V ...

  • Page 35

    ... INREF inref TEST 100 IN2N IN2P 15 18 470 nF V SSD(HW (asymmetrical supply) Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier V SSD(HW) OSCIO HVP1 DDP1 C vddp BOOT1 100 OUT1 V SSP1 STAB1 ...

  • Page 36

    ... IN2N HVP2 14 19 IN2P DREF SSD(HW) SSD(HW BTL (asymmetrical supply) Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier R hvp R hvp 470 470 vddp C hvp 100 nF 100 470 pF ...

  • Page 37

    ... TEST IN2N SSA IN2P 15 18 470 nF V SSD(HW SSA SE (symmetrical supply) Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier V SSD(HW) V SSA OSCIO HVP1 DDP1 C vddp BOOT1 C bo 100 OUT1 Optional V SSP1 R sn ...

  • Page 38

    ... OSCREF 10 HVPREF 11 INREF 12 C inref TEST 13 V IN2N SSA 14 IN2P 15 V SSD(HW SSA BTL (symmetrical supply) Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier V SSD(HW SSA OSCIO 31 HVP1 DDP1 29 C vddp BOOT1 100 ...

  • Page 39

    ... 2.5 scale (1) ( 0.30 0.20 11.1 5.1 6.2 3.6 0.19 0.09 10.9 4.9 6.0 3.4 REFERENCES JEDEC JEITA MO-153 Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifi detail 8.3 0.75 0.65 1 0.2 0.1 7.9 0.50 EUROPEAN PROJECTION SOT549 ...

  • Page 40

    ... NXP Semiconductors 16. Revision history Table 16. Revision history Document ID Release date TDA8933B_1 20081023 TDA8933B_1 Preliminary data sheet Data sheet status Change notice Preliminary data sheet - Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier Supersedes - © NXP B.V. 2008. All rights reserved ...

  • Page 41

    ... Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. http://www.nxp.com salesaddresses@nxp.com Rev. 01 — 23 October 2008 TDA8933B Class D audio amplifier © NXP B.V. 2008. All rights reserved ...

  • Page 42

    ... Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. © NXP B.V. 2008. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com TDA8933B All rights reserved. Date of release: 23 October 2008 Document identifier: TDA8933B_1 ...