SGS Thomson Microelectronics TDA7480 Datasheet

®

10W MONO CLASS-D AMPLIFIER

10W OUT P UT POWER:
R

= 8Ω/4Ω; THD = 10%

L

HIGH EFFICIENCY
NO HEATSINK
SPLIT SU PPLY
OVER VO LT AGE PROTE C T ION
ST-BY AND MUTE FEA T U RES
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION

DESCRIPTION

The TDA7480 is an audio class-D amplifier as­sembled in Power DIP package specially de­signed for high efficiency applications mainly for
TV and Home Stereo sets.

PDIP20

(14+3+3)

ORDERING NUMBER:

TDA7480

TDA7480

Figure 1: Test and Application Circuit.

+5V

R1

10K

R2

R3

7K

30K

MUTEST-BY 12

IN1

C2 0.33µF

C4 4.7nF

D96AU536E

C1

2.2
µF

ST-BY/

MUTE

IN1

C3

1nF

FEEDCAP

SGN-GND

C8

270pF

11

8

10

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

-VCC

(Pin 17)

N.C.
7,13

FREQ

R4 12KΩ

C5 100nF

V

CC POW

-

PRE

+

16 14

-V

CC

-VCC

+VCC

V

CC SIGN

100nF

-

PWM

+

C9

100nF

6

BOOT

4

OUT

BOOTDIODE

5

VREG

C7

2200µF

C10

2200µF

C11

100nF

C12

560pF

R5

150Ω

L1 60µH

C14

470nF

C15

100nF

8Ω

C6

15

-V

CC

-VCCRF

September 1998

1/10

TDA7480

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

DC Supply Voltage
Storage and Junction Temperature –40 to 150 °C

j

Maximum Voltage Across VFREQ (Pin 9) 8 V
Operating Temperature Range -20 to 70 °C

T

V

V

CC

stg

FREQ

T

op

, T

ESD Maximum ESD on Pins

20 V

±

1.8 kV

±

PIN CONNECTION (Top view)

Rth with "on board" Square Heatsink vs. cop­per area.

R

-V

CC

-V

CC

-V

CC

OUT

BOOTDIODE

BOOT

N.C.

FEEDCAP

FREQ

SGN-GND 10 IN11

1
2
3
4
5
6
7
8
9 STBY/MUTE

D96AU537B

20
19
18
17
16
15
14
13
12

-V

CC

-V

CC

-V

CC

-V

CC

+V

CC POW

VREG
+V

CC SIGN

N.C.

thj-a

(˚C/W)

60

50

40

30

COPPER AREA 35µ
THICKNESS

PC BOARD

D97AU675

0 4 8 12 Area(cm2)

THERMAL DATA

Symbol Parameter Value Unit

R

th j-amb

R

th j-pin

Thermal Resistance Junction to ambient 80 °C/W
Thermal Resistance Junction to Pin Max. 12 °C/W

PIN FUNCTIONS

N. Name Function

2/10

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20

-V

CC

-V

CC

-V

CC

OUT

BOOTDIODE

BOOT

NC

FEEDCAP

FREQUENCY

SGN-GND

IN

ST-BY-MUTE

NC

+V

SIGN

CC

VREG

+V

POW

CC

-V

CC

-V

CC

-V

CC

-V

CC

NEGATIVE SUPPLY.
NEGATIVE SUPPLY.
NEGATIVE SUPPLY.
PWM OUTPUT
BOOTSTRAP DIODE ANODE
BOOTSTRAP CAPACITOR
NOT CONNECTED
FEEDBACK INTEGRATING CAPACITANCE
SETTING FREQUENCY RESISTOR
SIGNAL GROUND
INPUT
ST-BY/ MUTE CONTROL PIN
NOT CONNECTED
POSITIVE SIGNAL SUPPLY
10V INTERNAL REGULATOR
POSITIVE POWER SUPPLY
NEGATIVE SUPPLY (TO BE CONNECTED TO PIN 16 VIA C5)
NEGATIVE SUPPLY
NEGATIVE SUPPLY
NEGATIVE SUPPLY

TDA7480

ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V

= 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; T

R

f

= ±14V; RL = 8Ω; RS = 50Ω;

CC

= 25°C unless otherwise specified.)

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

q

V

OS

P

O

P

(*) Dissipated Power at 1W Output

d

Supply Range
Total Quiescent Current RL = ∞; NO LC Filter 25 40 mA
Output Offset Voltage Play Condition –50 +50 mV
Output Power THD = 10%

THD = 1%
R

= 4Ω VCC = ±10.5V

L

THD = 10%
THD = 1%

Rf = 12KΩ PΟ = 1W 1 W

±

8.5

10

6

10

10

16 V

±

W

7

W

W

7

W

Power

P

DMAX

η

THD Total Harmonic Distortion R

I

max

Maximum Dissipated Power PΟ = 10W THD 10%

R

= 38°C/W (Area 12cm2)

th-j-amb

P

Efficiency ≡

O

PO + P

D

Overcurrent Protection

≡

P

O

(**)

P

I

THD 10%
R

= 38°C/W (Area 12cm2)

th-j-amb

= 8Ω; PO = 0.5W 0.1 %

L

RL = 0 3.5 5 A

1.8 W

80 85 %

Threshold

T

j

Thermal Shut-down Junction

150 °C

Temperature

G

V

e

N

R

i

Closed Loop Gain 29 30 31 dB
Total Input Noise A Curve

f = 20Hz to 22KHz

12

7

µ
µ

Input Resistance 20 30 K

V
V

Ω

SVR Supply Voltage Rejection f = 100Hz; Vr = 0.5 46 60 dB

T

r

R

DSON

F

F

SW_OP

, T

SW

Rising and Falling Time 50 ns

f

Power Transistor on Resistance 0.4
Switching Frequency 100 120 140 KHz
Switching Frequency Operative

100 200 KHz

Ω

Range

B

F

Zero Signal Frequency

1.4x10

9

Hz

Ω

Constant (***)

R

F

Frequency Controller Resistor

71214K

Ω

Range (****)

MUTE & STAND-BY FUNCTIONS

V

ST-BY

V

MUTE

V

PLAY

A

MUTE

I

qST-BY

*: 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.

**: P

= measured across the load using the following inductor:

O

COIL 58120 MPPA2 (magnetics) TURNS: 28 ∅ 1mm
COIL77120 KOOL M

***: The zero-signal switching frequency can be obtained using the following expression: F
****: The maximum value of RF is related to the maximum possible value for the voltage drop on RF itself.
(1): For V

Stand-by range 0.8 V
Mute Range 1.8 2.5 V
Play Range (1) 4 V
Mute Attenuation 60 80 dB
Quiescent Current @ Stand-by 3 5 mA

(magnetics) TURNS: 28

µ

>5.2V, an input impedance of 10KΩ is to be considered.

12

∅

1mm

SW

= BF/R

F

3/10

TDA7480

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

4/10

Figure 3: Stereo Application in Single Supply.

(*) +5V

MUTE/

ST-BY

IN LEFT

MUTE/

ST-BY

IN RIGHT

(*) +5V Referred to VCC/2

R1 10K

R3

30K

2.2µF

C2 0.33µF

C4 4.7nF

C16 0.33µF

C18 4.7nF

R2

10K

MUTE ST-BYC1

SGN-GND

ST-BY/MUTE

C3

1nF

FEEDCAP

C8

270pF

SGN-GND

ST-BY/MUTE

C17
1nF

FEEDCAP

C24

270pF

N.C.
7,13

10

12

IN

11

8

9

C19 100nF

N.C.
7,13

10

12

IN

11

8

9

TDA7480

FREQ

R4

12KΩ

TDA7480

FREQ

R8

12KΩ

-VCC

(Pin 17)

V

CC

14,16

LEFT

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

V

CC

14,16

RIGHT

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

C5 100nF

-V

CC SIGN

100nF

-V

CC SIGN

C22

100nF

TDA7480

C29

2200µF/

50VI
C30

2200µF/

50VI

+VS

L2 1µH

D97AU815C

R6

1K/2W

R7

1K/2W

C14

470nF

C28

470nF

C7

47µF/50VI

C10

47µF/50VI

L3 1µH

L4 1µH

C21

47µF/50VI

C23

47µF/50VI

L7 1µH

L8 1µH

OUT R

PGND

OUT R

PGND

L6 1µH

OUT
LEFT

OUT

RIGHT

C6

100nF

6

BOOT

C11

100nF

4

OUT

5

BOOTDIODE

15

VREG

C9

C20

100nF

6

BOOT

C25

100nF

4

OUT

5

BOOTDIODE

15

VREG

C15

100nF

C27

100nF

C12

560pF

R5

150Ω

C26

560pF

R9

150Ω

L1 60µH

L5 60µH

5/10

TDA7480

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

6/10

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

TDA7480

Figure 5. Output Power vs. Supply Voltage

Output Power (W)

16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1
0

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

Rl= 8 Ohm
F= 1 KHz

Thd=10%

Thd=1%

Supply Voltage (+/- V)

Figure 7. Distortion vs. Output Power

THD (%)

10

1

Vs= +/- 10.5V

0.1

012345678910

Output Power (W)

Rl= 4 Ohm
F= 1 KHz

Figure 6. Distortion vs. Output Power

THD (%)

10

1

0.1

0.01
012345678910

Vs= +/- 14V
Rl= 8 Ohm

F= 1 KHz

Output Power (W)

Figure 8. Power Dissipation and Efficiency vs.

Output Power

Power Dissipation (W)

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

012345678910

Efficiency

Pdiss

Output Power (W)

Efficiency (%)

Vs= +/- 14V
Rl= 8 Ohm
F= 1 KHz

100

80

60

40

20

0

Figure 9. Power Dissipation and Efficiency vs.

Output Power

Power Dissipation (W)

2.5

Efficiency

2

1.5

1

Pdiss

0.5

0

012345678910

Output Power (W)

Vs= +/- 10.5V
Rl= 4 Ohm
F= 1 KHz

Efficiency (%)

100
90
80
70
60
50
40
30
20
10
0

Figure 10. Mute Attenuation vs. Vpin 12

Attenuation (dB)

20
10

0

Vs= +/- 14V
Rl= 8 Ohm

-10

0 dB =1 W @ F= 1 KHz

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Vpin #12 (V)

7/10

0

TDA7480

Figure 11. Supply Voltage Rejection vs. Fre-

quency

S.V.R. (dB)

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

0.01 0.1 1 1

Vs= +/- 14V
Rl= 8 Ohm
Rs= 50 Ohm
Vr=0.5Vrms

Frequency (KHz)

8/10

POWERDIP20 PACKAGE MECHA NICAL DATA

TDA7480

DIM.

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

mm inch

9/10

TDA7480

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granted by impli cation or otherwis e under any patent or patent righ ts of STMicroelect ronics. Specifica tion mentioned in this publication are
subject to change without notic e. This public ation supers edes and replaces all information prev iously supplied. STMic roelec tronic s products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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