STMICROELECTRONICS TDA7490

TDA7490
25W + 25W STEREO CLASS-D AMPLIFIER
50W MONO IN BTL
1
FEATURES
Figure 1. Package
■
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
■
■
■
■
■
■
■
■
Flexiwatt 25
Table 1. Order Codes
2
Part Number
Package
TDA7490
Flexiwatt 25
DESCRIPTION
The TDA7490 is a dual audio class D amplifier assembled in Flexiwatt 25 package; it is specially designed for high efficiency application mainly for TV
and Home Stereo sets.
Figure 2. Test and Application Circuit. (Stereo Configuration)
R1 10K
R17 52.3K
MUTE
STBY
R2
30K
R3
10K
R21 4.7K
C26 470pF C25 470pF
7
6
INPUT1
9
10
PREAMPLIFIER1
C23
2200µF
14
+VCC
C22
100nF
2
C21
2200µF
R15
100
5
INTEGRATOR1
3
12
C3
100nF
-VCC
L1 30µ
C18 330pF
OUT1
C10
220nF
8
OSC
EXT_CK
C17
24pF
1
C7 100nF
-VCC
C19
560pF
R14 22K
16
R1 10K
C20
33nF
11
13
C4
100nF
-VCC
4
PWM-stage1
G=2.5
C2
1nF
-VCC
R4
130K
R20
68K
C27
2.2µF
C1 330nF
+VCC
15
R13
10K
C16 330pF
25
R 6.8
C5 330nF
INPUT2
C6
1nF
PREAMPLIFIER2
18
PWM-stage2
G=2.5
19
R5 4.7K
23
INTEGRATOR2
17
21
20
24
22
L2 30µ
R12 22K
C15
560pF
C14
33nF
OUT2
C29
220nF
R11
100
C8 470pF
-VCC
R6
68K
C9 470pF
C28
2200µF
-VCC
C11
100nF
C12
2200µF
+VCC
D98AU978A
R9 52.3K
December 2005
Rev. 6
1/10
TDA7490
Figure 3. Test and Application Circuit. (Bridge Configuration)
470pF
C40
R4
68K
C41
7
INPUT
R5 52.3K
470pF
The LC filter is optimized for 8Ω
(<->LC filter for 4Ω in single-ended)
It hos to be changed for other loads
9
-
10
L9 30µ
Int.
PWM-stage
3
+
PRE
C23
235nF
C26
470nF
dumping
(common
mode)
R27
10
R63
4.7K
C24
235nF
18
PRE
+
Int.
PWM-stage
23
-
19
R25
Rload
R28
10
C29
470nF
L10 30µ
17
470pF
470pF
C60 R61
68K
C59
R62 52.3K
D99AU1081
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (no signal)
±30
V
Ptot
Power Dissipation Tcase = 70°C
35
W
–40 to 150
°C
0 to 70
°C
±5
V
Value
Unit
1
°C/W
Tstg, Tj
Top
V6,8,10,18
Storage and Junction Temperature
Operating Temperature Range
Maximum Voltage on pins # 6,8,10,18 referred to GND
Table 3. Thermal Data
Symbol
Rth j-case
2/10
Parameter
Thermal Resistance Junction-case
Typ.
TDA7490
Figure 4. Pin Connection
Vreg
-VCC
+VCC
OUT2
N.C.
BOOT2
IN2
FEED4
FEED3
T2
-5V
GND
CURREF
T1
+5V
IN1
OSC
FEED2
FEED1
STBY-MUTE
+VCC
BOOT1
-VCC
25
OUT1
-VCC
1
D97AU816B
Table 4. Pin Description
Pin N°
Name
1
-VCC sign/sub
2
-VCCpow1
3
out 1
4
+VCCpow1
Function
Negative signal/substrate supply
Negative power supply CH1
PWM output of CH1
Positive power supply CH1
5
BOOT1
6
STBY-MUTE
Bootstrap CH1
7
FEED1
8
OSC
9
FEED2
10
IN1
Input CH1
11
T1
Triangular waveform CH1
Control State Pin
Feedback pin 1 CH1
Master Oscillator Setting Freequency Pin (or external sync.)
Feedback pin2 CH1
12
+5V
+5V regulator (only for internal purposes)
13
GND
Signal ground
14
CURREF
15
T2
Setting current resistor
Triangular waveform CH2
16
-5V
17
FEED3
18
IN2
19
FEED4
20
NC
Not connected
21
BOOT2
Bootstrap CH2
22
+VCCpow2
23
OUT2
24
-VCCpow2
25
Vreg
-5V regulator (only for internal purposes)
Feedback pin1 CH2
Input CH2
Feedback pin2 CH2
Positive power supply CH2
PWM output of CH2
Negative power supply CH2
10V regulator
3/10
TDA7490
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
VS
Supply Range
Iq
Total Quiescent Current
VOS
Po
Po(BTL)
Po(1)
Min.
±10
RL = ∞ no LC filter
Output Offset Voltage
70
-150
Output Power
THD = 10%
THD= 1%
Output Power in Bridge
Configuration
Output Power
mA
+150
mV
W
W
VS =±17V; RL = 8Ω
THD = 10%
THD=1%
50
40
W
W
RL = 4Ω Vcc=±16V
THD = 10%
THD=1%
25
18
W
W
6
W
89
%
0.1
%
5
A
150
°C
Efficiency (*)
Po = 20W + 20W
THD
Total Harmonic Distortion
RL = 8Ω; Po = 1 W
Imax
Overcurrent Protection
Threshold
RL = 0
80
3.5
Thermal Shut-down Junction
Temperature
∆Gv
V
120
50
40
η(2)
(3)
±25
VS = ±22V; RL = 16Ω
THD = 10%
THD=1%
VCC = ±21V; RL = 8Ω
Pο = 25W + 25W; THD = 10%
Gv
Unit
W
W
Maximum Dissipated Power
20
15
Max.
25
18
PD
Tj
Typ.
Closed Loop Gain
29
Gain Matching
-1
30
31
dB
+1
dB
eN
Total Input Noise
RG = 50Ω
A Curve
f = 20Hz to 22KHz
7
12
µV
µV
CT
Cross talk
f = 1 KHz, Po = 1W
55
dB
Ri
Input Resistance
30
kΩ
20
SVR
Supply Voltage Rejection
Vrmax
Overvoltage Threshold
(5)
Tr, Tt
Rising and Falling Time
RDSON
Fsw
(4)
f = 100Hz; Vr = 0.5
60
60
V
50
70
ns
0.4
0.8
Ω
200
230
KHz
0
07
V
1.7
2.5
V
Power Transistor on Resistance
Switching Frequency Range
dB
55
100
MUTE & STAND-BY FUNCTIONS
VST-BY
Stand-by range
VMUTE
Mute Range
VPLAY
Play Range
4
AMUTE
Mute Attenuation
55
IqST-BY
Quiescent Current @ Stand-by
5
60
3
*: 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
4/10
V
dB
5
mA
TDA7490
Figure 5. P.C. Board and Component Layout of the Figs. 2, 3
(for Stereo and Bridge Compatible Configuration)
Component
Side
Solder
Side
5/10
TDA7490
Figure 9. Frequency Response
Figure 6. Distortion vs. Output Power
D99AU1088
THD
(%)
5
Stereo
VS ± 21V; Rl=8Ω;
f=1KHz
2
AMP
(dB)
2
0
1
-2
0.5
-4
0.2
-6
0.1
-8
0.05
-10
0.02
-12
0.01
0
2
4
6
8
10
12
14
16
18
20
22
24 PO(W)
5
8
7.5
7
6.5
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
Stereo
VS ± 16V; Rl=4Ω;
f=1KHz
2
1
0.5
0.2
0.1
0.05
0.02
2
4
6
8
10
12
14
16
18
20
22
1
10
f(KHz)
Power Dissipation (W)
Vs= +/- 21 V; Rl = 8 Ohm; f= 1 KHz
0
2
4
6
8
10 12 14 16 18 20 22 24 26
Output Power (W)
Figure 11. Distortion vs. Output Power in BTL
D99AU1102
CT
(dB)
0.1
24 PO(W)
Figure 8. Crosstalk vs. Frequency
-20
-14
0.01
D99AU1089
THD
(%)
0
VS ± 21V;
Rl=8Ω;
0dB=1W
Figure 10. Power Dissipation vs. Output Power
Figure 7. Distortion vs. Output Power
0.01
D99AU1091
VS ± 17V;
Rl=8Ω;
0dB=1W
D99AU1082
THD
(%)
5
Bridge
VS ± 17V;
Rl=8Ω;
f=1KHz
2
-30
1
-40
0.5
-50
-60
0.2
-70
0.1
-80
0.05
-90
0.02
-100
0.001
6/10
0.01
0.1
1
f(KHz)
0.01
0
5
10
15
20
25
30
35
40
45
50 PO(W)
TDA7490
Figure 12. Distortion vs. Output Power in BTL
D99AU1083
THD
(%)
5
Bridge
VS ± 22V;
Rl=16Ω;
f=1KHz
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0
5
10
15
20
25
30
35
40
45
50 PO(W)
7/10
TDA7490
Figure 13. Package Dimensions
DIM.
A
B
C
D
E
F (1)
G
G1
H (2)
H1
H2
H3
L (2)
L1
L2 (2)
L3
L4
L5
M
M1
N
O
R
R1
R2
R3
R4
V
V1
V2
V3
MIN.
4.45
1.80
0.75
0.37
0.80
23.75
28.90
22.07
18.57
15.50
7.70
3.70
3.60
mm
TYP.
4.50
1.90
1.40
0.90
0.39
1.00
24.00
29.23
17.00
12.80
0.80
22.47
18.97
15.70
7.85
5
3.5
4.00
4.00
2.20
2
1.70
0.5
0.3
1.25
0.50
MAX.
4.65
2.00
MIN.
0.175
0.070
1.05
0.42
0.57
1.20
24.25
29.30
0.029
0.014
0.031
0.935
1.139
22.87
19.37
15.90
7.95
0.869
0.731
0.610
0.303
4.30
4.40
0.145
0.142
inch
TYP.
0.177
0.074
0.055
0.035
0.015
0.040
0.945
1.150
0.669
0.503
0.031
0.884
0.747
0.618
0.309
0.197
0.138
0.157
0.157
0.086
0.079
0.067
0.02
0.12
0.049
0.019
MAX.
0.183
0.079
OUTLINE AND
MECHANICAL DATA
0.041
0.016
0.022
0.047
0.955
1.153
0.904
0.762
0.626
0.313
0.169
0.173
Flexiwatt25 (vertical)
5˚ (T p.)
3˚ (Typ.)
20˚ (Typ.)
45˚ (Typ.)
(1): dam-bar protusion not included
(2): molding protusion included
V
C
B
V
H
H1
V3
A
H2
O
H3
R3
L4
R4
V1
R2
L2
N
L3
R
L
L1
V1
V2
R2
D
R1
L5
Pin 1
R1
R1
E
G
G1
F
FLEX25ME
M
M1
7034862
8/10
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”.
9/10
TDA7490
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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. Specifications 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.
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© 2005 STMicroelectronics - All rights reserved
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