STMICROELECTRONICS TDA7480

TDA7480
®
10W MONO CLASS-D AMPLIFIER
10W OUTPUT POWER:
RL = 8Ω/4Ω; THD = 10%
HIGH EFFICIENCY
NO HEATSINK
SPLIT SUPPLY
OVERVOLTAGE PROTECTION
ST-BY AND MUTE FEATURES
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
PDIP20 (14+3+3)
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.
ORDERING NUMBER: TDA7480
Figure 1: Test and Application Circuit.
+5V
+VCC
R1
10K
R2
7K
ST-BY
MUTE
C1
2.2
µF
C5 100nF
-VCC
(Pin 17)
R3
30K
N.C.
ST-BY/
MUTE
IN1
IN1
C2 0.33µF
C4 4.7nF
12
C6
100nF
VCC SIGN
VCC POW
7,13
16
C7
2200µF
14
6
11
+
C3
1nF
C11
100nF
4
-
PRE
BOOT
PWM
+
OUT
8
FEEDCAP
C12
560pF
R5
150Ω
L1 60µH
C14
470nF
8Ω
BOOTDIODE
SGN-GND
5
10
9
1,2,3,18,19,20
FREQ
C8
270pF
D96AU536E
September 1998
15
17
VREG
-VCC
-VCC
C15
100nF
R4 12KΩ
RF
-VCC
-VCC
C9
100nF
C10
2200µF
1/10
TDA7480
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VCC
Tstg, Tj
DC Supply Voltage
VFREQ
Maximum Voltage Across VFREQ (Pin 9)
Top
ESD
Operating Temperature Range
Storage and Junction Temperature
Value
Unit
±20
–40 to 150
°C
8
V
-20 to 70
°C
±1.8
kV
Maximum ESD on Pins
Rth with "on board" Square Heatsink vs. copper area.
PIN CONNECTION (Top view)
Rthj-a
(˚C/W)
-VCC
1
20
-VCC
-VCC
2
19
-VCC
-VCC
3
18
-VCC
OUT
4
17
-VCC
BOOTDIODE
5
16
+VCC POW
BOOT
6
15
VREG
N.C.
7
14
+VCC SIGN
FEEDCAP
8
13
N.C.
FREQ
9
12
STBY/MUTE
10
11
IN
SGN-GND
V
D97AU675
COPPER AREA 35µ
THICKNESS
60
PC BOARD
50
D96AU537B
40
30
0
4
8
12
Area(cm2)
THERMAL DATA
Symbol
Parameter
Rth j-amb
Thermal Resistance Junction to ambient
Rth j-pin
Thermal Resistance Junction to Pin
Max.
PIN FUNCTIONS
N.
Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
-VCC
-VCC
-VCC
OUT
BOOTDIODE
BOOT
NC
FEEDCAP
FREQUENCY
SGN-GND
IN
ST-BY-MUTE
NC
+VCC SIGN
VREG
+VCC POW
-VCC
-VCC
-VCC
-VCC
2/10
Function
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
Value
Unit
80
°C/W
12
°C/W
TDA7480
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.
Supply Range
VOS
Output Offset Voltage
Play Condition
–50
PO
Output Power
THD = 10%
THD = 1%
8.5
6
RL = ∞; NO LC Filter
Total Quiescent Current
Unit
25
±16
40
mA
+50
mV
RL = 4Ω VCC = ±10.5V
THD = 10%
THD = 1%
10
7
W
W
1
W
1.8
W
85
%
0.1
%
5
A
150
°C
Rf = 12KΩ PΟ = 1W
PDMAX
Maximum Dissipated Power
PΟ = 10W THD 10%
Rth-j-amb = 38°C/W (Area 12cm2)
PO
PO
(**)
≡
PO + PD PI
THD 10%
Rth-j-amb = 38°C/W (Area 12cm2)
THD
Total Harmonic Distortion
RL = 8Ω; PO = 0.5W
Imax
Overcurrent Protection
Threshold
RL = 0
Tj
Thermal Shut-down Junction
Temperature
GV
eN
Closed Loop Gain
Total Input Noise
80
3.5
29
A Curve
f = 20Hz to 22KHz
Ri
SVR
Input Resistance
Supply Voltage Rejection
Tr, Tf
Rising and Falling Time
RDSON
FSW
Power Transistor on Resistance
Switching Frequency
100
FSW_OP
Switching Frequency Operative
Range
100
f = 100Hz; Vr = 0.5
30
7
12
31
Zero Signal Frequency
Constant (***)
RF
Frequency Controller Resistor
Range (****)
dB
µV
µV
20
30
KΩ
46
60
dB
50
ns
140
Ω
KHz
200
KHz
0.4
120
1.4x109
BF
V
W
W
Dissipated Power at 1W Output
Power
Efficiency ≡
Max.
10
7
Pd (*)
η
Typ.
±10
VS
Iq
7
12
HzΩ
14
KΩ
0.8
V
2.5
V
V
MUTE & STAND-BY FUNCTIONS
VST-BY
Stand-by range
VMUTE
VPLAY
Mute Range
Play Range (1)
1.8
4
AMUTE
Mute Attenuation
60
IqST-BY
Quiescent Current @ Stand-by
80
3
dB
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.
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
TDA7480
Figure 3: Stereo Application in Single Supply.
R1 10K
-VCC
(Pin 17)
(*) +5V
R3
30K
C1
2.2µF
R2
10K
MUTE
+VS
C5 100nF
L2 1µH
ST-BY
C6
100nF
VCC
N.C.
SGN-GND
ST-BY/MUTE
MUTE/
ST-BY
C2 0.33µF
IN
IN LEFT
C4 4.7nF
7,13
14,16
6
10
4
12
TDA7480
11
C10
47µF/50VI
BOOT
C11
100nF
OUT
R5
150Ω
5
8
1,2,3,17,
18,19,20
9
FREQ
15
ST-BY/MUTE
MUTE/
ST-BY
C16 0.33µF
IN
IN RIGHT
PGND
C15
100nF
L4 1µH
C9
100nF
L6 1µH
14,16
10
6
4
C21
47µF/50VI
C25
100nF
TDA7480
C17
1nF
FEEDCAP
5
8
1,2,3,17,
18,19,20
9
FREQ
C24
270pF
(*) +5V Referred to VCC/2
L5 60µH
-VCC SIGN
R8
12KΩ
15
OUT R
C26
560pF
R9
150Ω
RIGHT
C18 4.7nF
C23
47µF/50VI
BOOT
OUT
12
11
C30
2200µF/
50VI
L3 1µH
C20
100nF
7,13
R7
1K/2W
OUT
LEFT
C14
470nF
VCC
N.C.
C29
2200µF/
50VI
VREG
-VCC SIGN
C19 100nF
SGN-GND
R6
1K/2W
OUT R
BOOTDIODE
R4
12KΩ
C8
270pF
L1 60µH
C12
560pF
LEFT
C3
1nF
FEEDCAP
C7
47µF/50VI
BOOTDIODE
OUT
RIGHT
C28
470nF
L7 1µH
PGND
VREG
C27
100nF
L8 1µH
C22
100nF
D97AU815C
5/10
TDA7480
Figure 4: PC Board and component Layout of the Circuit of Figure 3.
6/10
TDA7480
TYPICAL CHARACTERISTICS (Application Circuit of fig 1 unless otherwise specified)
Figure 5. Output Power vs. Supply Voltage
Figure 6. Distortion vs. Output Power
Output Power (W)
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
10
THD (%)
10
Rl= 8 Ohm
F= 1 KHz
Thd=10%
1
Vs= +/- 14V
Rl= 8 Ohm
0.1
Thd=1%
F= 1 KHz
10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
16
0.01
0
1
2
3
Supply Voltage (+/- V)
5
6
7
8
9
10
Figure 8. Power Dissipation and Efficiency vs.
Output Power
Figure 7. Distortion vs. Output Power
10
4
Output Power (W)
THD (%)
2
Power Dissipation (W)
1.8
Efficiency (%)
100
Efficiency
1.6
80
1.4
1
1.2
60
1
Pdiss
0.8
Vs= +/- 10.5V
Rl= 4 Ohm
0.1
40
Vs= +/- 14V
Rl= 8 Ohm
F= 1 KHz
0.6
F= 1 KHz
0.4
20
0.2
0
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
Output Power (W)
Figure 9. Power Dissipation and Efficiency vs.
Output Power
2.5
Power Dissipation (W)
100
90
Efficiency
80
2
70
60
1.5
50
40
1
Vs= +/- 10.5V
Rl= 4 Ohm
F= 1 KHz
0.5
30
20
10
0
0
1
2
3
4
5
6
Output Power (W)
6
7
8
0
10
9
Figure 10. Mute Attenuation vs. Vpin 12
Efficiency (%)
Pdiss
5
Output Power (W)
7
8
9
0
10
20
10
Attenuation (dB)
0
Vs= +/- 14V
Rl= 8 Ohm
0 dB =1 W @ F= 1 KHz
-10
-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
TDA7480
Figure 11. Supply Voltage Rejection vs. Frequency
0
S.V.R. (dB)
-10
-20
-30
Vs= +/- 14V
Rl= 8 Ohm
Rs= 50 Ohm
Vr=0.5Vrms
-40
-50
-60
-70
-80
-90
-100
-110
-120
0.01
0.1
1
Frequency (KHz)
8/10
10
TDA7480
POWERDIP20 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
a1
0.51
B
0.85
b
b1
TYP.
inch
MAX.
MIN.
TYP.
MAX.
0.020
1.40
0.033
0.50
0.38
0.020
0.50
D
0.055
0.015
0.020
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
Z
3.30
0.130
1.27
0.050
9/10
TDA7480
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of 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
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized 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
© 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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