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TDA7490

December 2005

1 FEATURES 25W + 25W OUTPUT POWER:

@RL = 8Ω/4Ω; THD = 10%

HIGH EFFICIENCY WIDE SUPPLY VOLTAGE RANGE (FROM ±10

TO ±25V) SPLIT SUPPLY TURN OFF/ON POP FREE ST-BY AND MUTE FEATURES SHORT CIRCUIT PROTECTION ACROSS

THE LOAD THERMAL OVERLOAD PROTECTION EXTERNALLY SINCHRONIZABLE BRIDGE CONFIGURATION

2 DESCRIPTIONThe TDA7490 is a dual audio class D amplifier as-sembled in Flexiwatt 25 package; it is specially de-signed for high efficiency application mainly for TVand Home Stereo sets.

25W + 25W STEREO CLASS-D AMPLIFIER50W MONO IN BTL

Figure 2. Test and Application Circuit. (Stereo Configuration)

PWM-stage1G=2.5

PREAMPLIFIER1INTEGRATOR1

R21 4.7KC26 470pF C25 470pF

R2068K

R17 52.3K

C232200µF

C22100nF

C212200µF

R4130K

L1 30µ

INPUT1

OSC

C19560pF

C2033nF

C18 330pF

C1724pF

C16 330pF

R15100

-VCC

R14 22K

R12 22K

C10220nF

OUT1

PWM-stage2

L2 30µ OUT2

C29220nF

R1310K

C15560pF

R11100

-VCC

EXT_CK

G=2.5

PREAMPLIFIER2

C8 470pF

C9 470pFR668K

R5 4.7K

C1433nF

R9 52.3K

+VCC-VCC+VCC

+VCC-VCC

C282200µF

C122200µF

C11100nF

C1 330nF

C21nF

STBYMUTE R230K

C272.2µF

R1 10K

C3100nF

C4100nF

INPUT2

C5 330nF

C61nF

-VCC

-VCC

D98AU978A

7 9 14 2 46

10

12

13

16

1

25

18

19 17 20 24 22

21

23

15

8

11

3

5

INTEGRATOR2

R310K

C7 100nF

R1 10K

R 6.8

Rev. 6

Figure 1. Package

Table 1. Order Codes

Part Number Package

TDA7490 Flexiwatt 25

Flexiwatt 25

TDA7490

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Figure 3. Test and Application Circuit. (Bridge Configuration)

Table 2. Absolute Maximum Ratings

Table 3. Thermal Data

Symbol Parameter Value Unit

VCC DC Supply Voltage (no signal) ±30 V

Ptot Power Dissipation Tcase = 70°C 35 W

Tstg, Tj Storage and Junction Temperature –40 to 150 °C

Top Operating Temperature Range 0 to 70 °C

V6,8,10,18 Maximum Voltage on pins # 6,8,10,18 referred to GND ±5 V

Symbol Parameter Value Unit

Rth j-case Thermal Resistance Junction-case Typ. 1 °C/W

PWM-stagePRE +

-

-

+

470pF 470pF

R468K

R5 52.3K

L9 30µINPUT

C23235nF

PWM-stageL10 30µ

C26470nF

dumping(common

mode)

The LC filter is optimized for 8Ω(<->LC filter for 4Ω in single-ended)It hos to be changed for other loads

C24235nF

C29470nF

R2810

R2710

R25Rload

PRE

470pF 470pF

R6168K

R62 52.3K

D99AU1081

7 9

10

18

19 17

23

3

R634.7K

Int.

Int.

C40

C60 C59

C41

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TDA7490

Figure 4. Pin Connection

Table 4. Pin Description

Pin N° Name Function

1 -VCC sign/sub Negative signal/substrate supply

2 -VCCpow1 Negative power supply CH1

3 out 1 PWM output of CH1

4 +VCCpow1 Positive power supply CH1

5 BOOT1 Bootstrap CH1

6 STBY-MUTE Control State Pin

7 FEED1 Feedback pin 1 CH1

8 OSC Master Oscillator Setting Freequency Pin (or external sync.)

9 FEED2 Feedback pin2 CH1

10 IN1 Input CH1

11 T1 Triangular waveform CH1

12 +5V +5V regulator (only for internal purposes)

13 GND Signal ground

14 CURREF Setting current resistor

15 T2 Triangular waveform CH2

16 -5V -5V regulator (only for internal purposes)

17 FEED3 Feedback pin1 CH2

18 IN2 Input CH2

19 FEED4 Feedback pin2 CH2

20 NC Not connected

21 BOOT2 Bootstrap CH2

22 +VCCpow2 Positive power supply CH2

23 OUT2 PWM output of CH2

24 -VCCpow2 Negative power supply CH2

25 Vreg 10V regulator

D97AU816B

-VC

C

-VC

C

OU

T1

+V

CC

BO

OT

1

ST

BY

-MU

TE

FE

ED

1

OS

C

FE

ED

2

IN1

T1

+5V

GN

D

CU

RR

EF T2

-5V

FE

ED

3

IN2

FE

ED

4

N.C

.

BO

OT

2

+V

CC

OU

T2

-VC

C

Vre

g

1 25

TDA7490

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*: Po = measured across the load using the following inductor: COIL58120 MPPA 2 (magnectics) TURNS= 20∅ 1 mm(1) L = 15µH, C = 470nF(2) ηTop = 90% where Vcc = ±25V; RL = 8Ω; Po = 43W + 43W; THD = 20%(3) ∆Gv is intended with R2, R17, R5, R9 1% precision(4) Fsw = 0.25 · (1/(300ns + R13 · (C17 + 76pF) . 0.85)(5) VRMAX = (+Vcc) - (-Vcc) when VR ≥VRMAX the device goes in Stand-By mode

Table 5. Electrical Characteristics (Refer to the test circuit, VCC = ±21V; RL = 8Ω; Demod. filter L = 30µH, C = 220nF; f = 1KHz; fsw = 200kHz;Tamb = 25°C unless otherwise specified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

VS Supply Range ±10 ±25 V

Iq Total Quiescent Current RL = ∞ no LC filter 70 120 mA

VOS Output Offset Voltage -150 +150 mV

Po Output Power THD = 10%THD= 1%

2015

2518

WW

Po(BTL) Output Power in BridgeConfiguration

VS = ±22V; RL = 16ΩTHD = 10%THD=1%

5040

WW

VS =±17V; RL = 8ΩTHD = 10%THD=1%

5040

WW

Po(1) Output Power RL = 4Ω Vcc=±16V

THD = 10%THD=1%

2518

WW

PD Maximum Dissipated Power VCC = ±21V; RL = 8ΩPο = 25W + 25W; THD = 10%

6 W

η(2) Efficiency (*) Po = 20W + 20W 80 89 %

THD Total Harmonic Distortion RL = 8Ω; Po = 1 W 0.1 %

Imax Overcurrent ProtectionThreshold

RL = 0 3.5 5 A

Tj Thermal Shut-down JunctionTemperature

150 °C

Gv Closed Loop Gain 29 30 31 dB

∆Gv (3) Gain Matching -1 +1 dB

eN Total Input NoiseRG = 50Ω

A Curvef = 20Hz to 22KHz

712

µVµV

CT Cross talk f = 1 KHz, Po = 1W 55 dB

Ri Input Resistance 20 30 kΩ

SVR Supply Voltage Rejection f = 100Hz; Vr = 0.5 60 dB

Vrmax Overvoltage Threshold (5) 55 60 V

Tr, Tt Rising and Falling Time 50 70 ns

RDSON Power Transistor on Resistance 0.4 0.8 Ω

Fsw (4) Switching Frequency Range 100 200 230 KHz

MUTE & STAND-BY FUNCTIONS

VST-BY Stand-by range 0 0 7 V

VMUTE Mute Range 1.7 2.5 V

VPLAY Play Range 4 5 V

AMUTE Mute Attenuation 55 60 dB

IqST-BY Quiescent Current @ Stand-by 3 5 mA

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TDA7490

Figure 5. P.C. Board and Component Layout of the Figs. 2, 3(for Stereo and Bridge Compatible Configuration)

ComponentSide

SolderSide

TDA7490

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Figure 6. Distortion vs. Output Power

Figure 7. Distortion vs. Output Power

Figure 8. Crosstalk vs. Frequency

Figure 9. Frequency Response

Figure 10. Power Dissipation vs. Output Power

Figure 11. Distortion vs. Output Power in BTL

0 2 4 6 16 18 20 22 248 10 12 14 PO(W)0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

THD(%)

D99AU1088

StereoVS ± 21V; Rl=8Ω;f=1KHz

0 2 4 6 16 18 20 22 248 10 12 14 PO(W)0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

THD(%)

D99AU1089

StereoVS ± 16V; Rl=4Ω;f=1KHz

0.001 0.01 0.1 1 f(KHz)111

CT(dB)

-20

-30

-40

-50

-60

-70

-80

-90

-100

VS ± 17V;Rl=8Ω;0dB=1W

D99AU1102

0.01 0.1 1 10 f(KHz)-14

-12

-10

-8

-6

-4

-2

0

2

AMP(dB)

VS ± 21V;Rl=8Ω;0dB=1W

D99AU1091

0 2 4 6 8 10 12 14 16 18 20 22 24 26Output Power (W)

00.5

11.5

22.5

33.5

44.5

55.5

66.5

77.5

8Power Dissipation (W)

Vs= +/- 21 V; Rl = 8 Ohm; f= 1 KHz

0 5 10 15 20 25 30 35 40 45 50 PO(W)0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

THD(%)

D99AU1082

BridgeVS ± 17V;Rl=8Ω;f=1KHz

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TDA7490

Figure 12. Distortion vs. Output Power in BTL

0 5 10 15 20 25 30 35 40 45 50 PO(W)0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

THD(%)

D99AU1083

BridgeVS ± 22V;Rl=16Ω;f=1KHz

TDA7490

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Figure 13. Package Dimensions

OUTLINE ANDMECHANICAL DATA

DIM. mm inchMIN. TYP. MAX. MIN. TYP. MAX.

A 4.45 4.50 4.65 0.175 0.177 0.183B 1.80 1.90 2.00 0.070 0.074 0.079C 1.40 0.055D 0.75 0.90 1.05 0.029 0.035 0.041E 0.37 0.39 0.42 0.014 0.015 0.016

F (1) 0.57 0.022G 0.80 1.00 1.20 0.031 0.040 0.047G1 23.75 24.00 24.25 0.935 0.945 0.955

H (2) 28.90 29.23 29.30 1.139 1.150 1.153H1 17.00 0.669H2 12.80 0.503H3 0.80 0.031

L (2) 22.07 22.47 22.87 0.869 0.884 0.904L1 18.57 18.97 19.37 0.731 0.747 0.762

L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626L3 7.70 7.85 7.95 0.303 0.309 0.313L4 5 0.197L5 3.5 0.138M 3.70 4.00 4.30 0.145 0.157 0.169M1 3.60 4.00 4.40 0.142 0.157 0.173N 2.20 0.086O 2 0.079R 1.70 0.067R1 0.5 0.02R2 0.3 0.12R3 1.25 0.049R4 0.50 0.019

V1 3˚ (Typ.)V 5˚ (T p.)

V2 20˚ (Typ.)V3 45˚ (Typ.)

(2): molding protusion included(1): dam-bar protusion not included

Flexiwatt25 (vertical)

H3

R4

G

V

G1

L2

H1H

FM1

L

FLEX25ME

V3

OL3

L4

H2

R3

N

V2

R

R2

R2

C

B

L1

M

R1

L5 R1 R1

E

D

A

Pin 1

V

V1

V1

7034862

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TDA7490

Table 6. Revision History

Date Revision Description of Changes

March 2001 5 First Issue

December 2005 6 Corrected the value of the inductance in the caption of the Table 5 “Electrical Characteristics”.

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequencesof use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is grantedby implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subjectto change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are notauthorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics.All other names are the property of their respective owners

© 2005 STMicroelectronics - All rights reserved

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TDA7490