TDA7480

10W MONO CLASS-D AMPLIFIER

10W OUTPUT POWER:RL = 8Ω/4Ω; THD = 10%HIGH EFFICIENCYNO HEATSINKSPLIT SUPPLYOVERVOLTAGE PROTECTIONST-BY AND MUTE FEATURESSHORT CIRCUIT PROTECTIONTHERMAL OVERLOAD PROTECTION

DESCRIPTIONThe TDA7480 is an audio class-D amplifier as-sembled in Power DIP package specially de-signed for high efficiency applications mainly forTV and Home Stereo sets.

September 1998

®

L1 60µH

8Ω

+

-

+

-PWM

PRE

11

8

C2 0.33µF

IN1

C4 4.7nF

FEEDCAP

OUT

BOOT

C11100nF

C12560pF

R5150Ω

C14470nF

6

4

VREGC15

100nF

R4 12KΩ

15

5

C102200µF

C9100nF

SGN-GND10

MUTEST-BY 12 16 14

+VCC

ST-BY/MUTE

C12.2µF

R330K

R27K

VCC SIGN

C72200µF

IN1

D96AU536E

-VCC(Pin 17)

C6100nF

C31nF

R110K

+5V

VCC POW

7,13

N.C.

C5 100nF

BOOTDIODE

C8270pF

9 1,2,3,18,19,20 17

-VCCFREQ -VCC

-VCCRF

-VCC

Figure 1: Test and Application Circuit.

ORDERING NUMBER: TDA7480

PDIP20 (14+3+3)

1/10

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

VCC DC Supply Voltage ±20 V

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

VFREQ Maximum Voltage Across VFREQ (Pin 9) 8 V

Top Operating Temperature Range -20 to 70 °C

ESD Maximum ESD on Pins ±1.8 kV

THERMAL DATA

Symbol Parameter Value Unit

Rth j-amb Thermal Resistance Junction to ambient 80 °C/W

Rth j-pin Thermal Resistance Junction to Pin Max. 12 °C/W

PIN FUNCTIONS

N. Name Function

123456789

1011121314151617181920

-VCC-VCC-VCCOUT

BOOTDIODEBOOT

NCFEEDCAP

FREQUENCYSGN-GND

INST-BY-MUTE

NC+VCC SIGN

VREG+VCC POW

-VCC-VCC-VCC-VCC

NEGATIVE SUPPLY.NEGATIVE SUPPLY.NEGATIVE SUPPLY.PWM OUTPUTBOOTSTRAP DIODE ANODEBOOTSTRAP CAPACITORNOT CONNECTEDFEEDBACK INTEGRATING CAPACITANCESETTING FREQUENCY RESISTORSIGNAL GROUNDINPUTST-BY/ MUTE CONTROL PINNOT CONNECTEDPOSITIVE SIGNAL SUPPLY10V INTERNAL REGULATORPOSITIVE POWER SUPPLYNEGATIVE SUPPLY (TO BE CONNECTED TO PIN 16 VIA C5)NEGATIVE SUPPLYNEGATIVE SUPPLYNEGATIVE SUPPLY

-VCC

OUT

BOOTDIODE

N.C.

BOOT

FEEDCAP

FREQ

1

3

2

4

5

6

7

8

9 STBY/MUTE

N.C.

+VCC SIGN

+VCC POW

VREG

-VCC

-VCC

20

19

18

17

16

14

15

13

12

D96AU537B

SGN-GND 10 IN11

-VCC

-VCC

-VCC

-VCC

PIN CONNECTION (Top view)

0 4 8 12 Area(cm2)30

40

50

60

Rthj-a(˚C/W)

D97AU675

COPPER AREA 35µTHICKNESS

PC BOARD

Rth with "on board" Square Heatsink vs. cop-per area.

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ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VCC = ±14V; RL = 8Ω; RS = 50Ω;Rf = 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; Tamb = 25°C unless otherwise specified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

VS Supply Range ±10 ±16 V

Iq Total Quiescent Current RL = ∞; NO LC Filter 25 40 mA

VOS Output Offset Voltage Play Condition –50 +50 mV

PO Output Power THD = 10%THD = 1%

8.56

107

WW

RL = 4Ω VCC = ±10.5VTHD = 10%THD = 1%

107

WW

Pd (*) Dissipated Power at 1W OutputPower

Rf = 12KΩ PΟ = 1W 1 W

PDMAX Maximum Dissipated Power PΟ = 10W THD 10%Rth-j-amb = 38°C/W (Area 12cm2)

1.8 W

ηEfficiency ≡

PO

PO + PD ≡

PO

PI (**)

THD 10%Rth-j-amb = 38°C/W (Area 12cm2)

80 85 %

THD Total Harmonic Distortion RL = 8Ω; PO = 0.5W 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

eN Total Input Noise A Curvef = 20Hz to 22KHz

712

µVµV

Ri Input Resistance 20 30 KΩSVR Supply Voltage Rejection f = 100Hz; Vr = 0.5 46 60 dB

Tr, Tf Rising and Falling Time 50 ns

RDSON Power Transistor on Resistance 0.4 ΩFSW Switching Frequency 100 120 140 KHz

FSW_OP Switching Frequency OperativeRange

100 200 KHz

BF Zero Signal FrequencyConstant (***)

1.4x109 HzΩ

RF Frequency Controller ResistorRange (****)

7 12 14 KΩ

MUTE & STAND-BY FUNCTIONS

VST-BY Stand-by range 0.8 V

VMUTE Mute Range 1.8 2.5 V

VPLAY Play Range (1) 4 V

AMUTE Mute Attenuation 60 80 dB

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

*: The output average power when the amplifier is playing music can be considered roughly 1/10 of the maximum output power. So it is useful to consider the dissipated power in this condition for thermal dimensioning.

**: PO = measured across the load using the following inductor: COIL 58120 MPPA2 (magnetics) TURNS: 28 ∅ 1mm COIL77120 KOOL Mµ (magnetics) TURNS: 28 ∅ 1mm

***: The zero-signal switching frequency can be obtained using the following expression: FSW = BF/RF

****: The maximum value of RF is related to the maximum possible value for the voltage drop on RF itself.

(1): For V12 >5.2V, an input impedance of 10KΩ is to be considered.

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Figure 2: Recomended P.C. Board and Component Layout of the Circuit of Figure1 (1.25:1 scale).

Note: Capacitor C5 must be as close as possible to device’s pins 16 and 17

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L1 60µH

OUTLEFT

11

8

C2 0.33µF

IN LEFT

C4 4.7nF

FEEDCAP

OUT

BOOT

C11100nF

C12560pF

R5150Ω

C14470nF

6

4

VREG

C15100nF

R412KΩ

15

5

C9100nF

SGN-GND10

12

14,16

ST-BY/MUTE

C747µF/50VI

IN

D97AU815C

-VCC(Pin 17)

C6100nF

C31nF

VCC

7,13

N.C.

C5 100nF

BOOTDIODE

C8270pF

91,2,3,17,18,19,20

-VCC SIGNFREQ

MUTE/ST-BY

L3 1µH

OUT R

PGND

L4 1µH

R71K/2W

R61K/2W

L2 1µH

C1047µF/50VI

MUTE ST-BYC12.2µF

R330K

R210K

R1 10K(*) +5V

+VS

C292200µF/

50VI

C302200µF/

50VI

L5 60µH

OUTRIGHT

11

8

C16 0.33µF

IN RIGHT

C18 4.7nF

FEEDCAP

OUT

BOOT

C25100nF

C26560pF

R9150Ω

C28470nF

6

4

VREG

C27100nF

R812KΩ

15

5

C22100nF

SGN-GND10

12

14,16

ST-BY/MUTE

C2147µF/50VI

IN

C20100nF

C171nF

VCC

7,13

N.C.

C19 100nF

BOOTDIODE

C24270pF

91,2,3,17,18,19,20

-VCC SIGNFREQ

MUTE/ST-BY

L7 1µH

OUT R

PGND

L8 1µH

L6 1µH

C2347µF/50VI

TDA7480

LEFT

TDA7480

RIGHT

(*) +5V Referred to VCC/2

Figure 3: Stereo Application in Single Supply.

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Figure 4: PC Board and component Layout of the Circuit of Figure 3.

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Vs= +/- 10.5VRl= 4 Ohm

F= 1 KHz

0 1 2 3 4 5 6 7 8 9 10

Output Power (W)

0.1

1

10THD (%)

Figure 7. Distortion vs. Output Power

10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16

Supply Voltage (+/- V)

0123456789

10111213141516

Output Power (W)

Rl= 8 OhmF= 1 KHz Thd=10%

Thd=1%

Figure 5. Output Power vs. Supply Voltage

0 1 2 3 4 5 6 7 8 9 10

Output Power (W)

0

0.5

1

1.5

2

2.5Power Dissipation (W)

0

10

20

30

40

50

60

70

80

90

100Efficiency (%)

Vs= +/- 10.5VRl= 4 Ohm F= 1 KHz

Pdiss

Efficiency

Figure 9. Power Dissipation and Efficiency vs.Output Power

0 1 2 3 4 5 6 7 8 9 10

Output Power (W)

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2Power Dissipation (W)

0

20

40

60

80

100Efficiency (%)

Vs= +/- 14VRl= 8 Ohm F= 1 KHz

Efficiency

Pdiss

Figure 8. Power Dissipation and Efficiency vs.Output Power

Vs= +/- 14VRl= 8 Ohm

F= 1 KHz

0 1 2 3 4 5 6 7 8 9 10

Output Power (W)

0.01

0.1

1

10THD (%)

Figure 6. Distortion vs. Output Power

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Vpin #12 (V)

0

10

20

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

Attenuation (dB)

Vs= +/- 14VRl= 8 Ohm0 dB =1 W @ F= 1 KHz

Figure 10. Mute Attenuation vs. Vpin 12

TYPICAL CHARACTERISTICS (Application Circuit of fig 1 unless otherwise specified)

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0.01 0.1 1 10

Frequency (KHz)

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

S.V.R. (dB)

Vs= +/- 14VRl= 8 OhmRs= 50 OhmVr=0.5Vrms

Figure 11. Supply Voltage Rejection vs. Fre-quency

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POWERDIP20 PACKAGE MECHANICAL DATA

DIM.mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.85 1.40 0.033 0.055

b 0.50 0.020

b1 0.38 0.50 0.015 0.020

D 24.80 0.976

E 8.80 0.346

e 2.54 0.100

e3 22.86 0.900

F 7.10 0.280

I 5.10 0.201

L 3.30 0.130

Z 1.27 0.050

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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 isgranted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication aresubject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics productsare not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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