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TDA7490L

December 2005

1 FEATURES 20W + 20W OUTPUT POWER:

@RL = 8Ω/4Ω; THD = 10%

HIGH EFFICIENCY WIDE SUPPLY VOLTAGE RANGE (FROM ±10

TO ±25V) SPLIT SUPPLY, SINGLE SUPPLY

OPERATION 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 TDA7490L is a dual audio class D amplifierassembled in Flexiwatt 25 package; it is speciallydesigned for high efficiency application mainly forTV and Home Stereo sets.

20W + 20W STEREO CLASS-D AMPLIFIER40W 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. 2

Figure 1. Package

Table 1. Order Codes

Part Number Package

TDA7490L Flexiwatt 25

Flexiwatt 25

TDA7490L

2/11

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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TDA7490L

Figure 4. Application in Supply Voltage

*

*

*

*

* New component

EXT_CK

+VS

IN 1

IN 2

+Vs

+Vs

+Vs

C20

33nF

12

C18330pF1 2

C14

33nF

12

C19

560pF

12

C16 330pF1 2

C17 24pF 12

C29

220nF

12

C26470pF

12

C25470pF

12

C7 100nF1 2C15

560pF

12

L1 30uF

1 2

R15

100

12

R14

22K

1 2

R1222K1 2

OUT 212

1 2

L230uH

1 2

R11

100

12

R4

130K

12

R20

68K1

2

R1752.3K1 2

R21

4.7K1 2

R2

30k

12

R1

10K

1 2

R3

10k

12

Stby

12

Mute

12

C1 330nF

1 2

C21nF

12

C3 100nF

12

C5330nF

1 2

C4 100nF

12

C6

1nF

12

C9470pF

12

C8

470pF

12

R668K

12

R9

52.3K

12

R54.7K

12

C27

1 uF

12

R13

10K

12

C10

220nF

12

OUT 112

C21

2200uF

12

C12

2200uF

12

R22

1K

12

R23

1K

12

C22

100nF

1 2

U1

TDA7490L

MU

TE

6

IN 110

-VS1

IN 218

10V REG25

OUT13

BOOT15

-5V REG16

+5V REG12

SGND13

BOOT221

FE

ED

17

FE

ED

29

T111

T215

OSC8

+V

SP

222

FE

ED

419

-VS

P2

24

FE

ED

317

OUT223

N.C

.20

CU

RR

EF

14

+V

SP

14

-VS

P1

2

C11

100uF

1 2

TDA7490L

4/11

Figure 5. 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

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TDA7490L

*: Po = measured across the load using the following inductor: COIL58120 MPPA 2 (magnectics) TURNS= 20∅ 1 mm(1) L = 15µH, C = 470nF(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 = ±19V; 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%

2016

WW

Po(BTL) Output Power in BridgeConfiguration

VS = ±20V; RL = 16ΩTHD = 10%THD=1%

4032

WW

VS =±15.5V; RL = 8ΩTHD = 10%THD=1%

4032

WW

Po(1) Output Power RL = 4Ω Vcc=±13.5V

THD = 10%THD=1%

1814.5

WW

PD Maximum Dissipated Power VCC = ±19V; RL = 8ΩPο = 20W + 20W; THD = 10%

5.6 W

η Efficiency (') Po = 20W + 20W 86 %

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

Imax Overcurrent ProtectionThreshold

RL = 0 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

TDA7490L

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Figure 6. P.C. Board and Component Layout of the Figs. 2, 3 (for Stereo and Bridge Compatible Configuration)

ComponentSide

SolderSide

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TDA7490L

Figure 7. Distortion vs. Output Power

Figure 8. Distortion vs. Output Power

Figure 9. Crosstalk vs. Frequency

Figure 10. Frequency Response

Figure 11. Power Dissipation vs. Output Power

Figure 12. Distortion vs. Output Power in BTL

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 30500m 1 2 5 10 20

Pout (W)

THD (%)

Stereo

Vcc=+/-19V

Rl = 8 ohm

f = 1KHz

Filter AES

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 30500m 1 2 5 10 20

Pout (W)

THD (%)

Stereo

Vcc=+/-19V

Rl = 8 ohm

f = 1KHz

Filter AES

THD (%)

Stereo

Vcc=+/-19V

Rl = 8 ohm

f = 1KHz

Filter AES

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 20500m 1 2 5 10

THD(%)

Pout(W)

Stereo

Vs=+/-13.5V, Rl=4Ohm

f = 1KHz

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 20500m 1 2 5 10

THD(%)

Pout(W)

Stereo

Vs=+/-13.5V, Rl=4Ohm

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= ±17V;Rl= 8Ω;0dB= 1W

D99AU1103

Ptot(W)

0

1

2

3

4

5

6

7

8

0.5 2 4 6 8 10 12 14 16 18 20

2xPo(W)

Vs=± 19V

Rl = 8 ohm

f = 1KHz

Ptot(W)

0

1

2

3

4

5

6

7

8

0.5 2 4 6 8 10 12 14 16 18 20

2xPo(W)

Vs=± 19V

Rl = 8 ohm

f = 1KHz

0

1

2

3

4

5

6

7

8

0.5 2 4 6 8 10 12 14 16 18 20

2xPo(W)

Vs=± 19V

Rl = 8 ohm

f = 1KHz

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 50500m 1 2 5 10 20

Pout (W)

THD (%)

BTL

Vcc=+/-15.5 V

Rl = 8ohm

f = 1KHZ

Filter AES

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 50500m 1 2 5 10 20

Pout (W)

THD (%)

BTL

Vcc=+/-15.5 V

Rl = 8ohm

f = 1KHZ

Filter AES

TDA7490L

8/11

Figure 13. Distortion vs. Output Power in BTL Figure 14. Pout vs Supply Voltage

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 50500m 1 2 5 10 20Pout (W)

THD (%)

BTL

Vcc=+/-20V

Rl=16ohm

f = 1KHz

Filter AES

0.01

10

0.02

0.05

0.1

0.2

0.5

1

2

5

200m 50500m 1 2 5 10 20Pout (W)

THD (%)

BTL

Vcc=+/-20V

Rl=16ohm

f = 1KHz

Filter AES

0

5

10

15

20

25

10 12 14 16 18 20

Pout (W)

Stereo

Rl = 8ohm

f = 1KHZ

THD=1%

THD=10%

Vs ( +/-V)

0

5

10

15

20

25

10 12 14 16 18 20

0

5

10

15

20

25

10 12 14 16 18 20

Pout (W)

Stereo

Rl = 8ohm

f = 1KHZ

THD=1%

THD=10%

Vs ( +/-V)

Stereo

Rl = 8ohm

f = 1KHZ

THD=1%

THD=10%

Vs ( +/-V)

9/11

TDA7490L

Figure 15. Flexiwatt 25 Mechanical Data & 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

TDA7490L

10/11

Table 6. Revision History

Date Revision Description of Changes

March 2001 1 First Issue

December 2005 2 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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TDA7490L