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25W + 25W STEREO CLASS-D AMPLIFIER 50W MONO IN BTL
®
TDA7490
25W + 25W STEREO CLASS-D AMPLIFIER
50W MONO IN BTL
PRODUCT PREVIEW
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
ORDERING NUMBER: TDA7490
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 1. Test and application circuit. (Stereo Configuration)
R1 10K
R17 52.3K
+V C C
-V C C
+V C C
MUTE
STBY
R2
30K
C26 470pF C25 470pF
R21 4.7K
R3
10K
C27
2.2 m F
R20
68K
R4
130K
C23
2200
m
F
C22
100nF
C21
2200
m
F
-V C C
6
10
7
9
14
2
4
R15
100
C1 330nF
5
C20
33nF
C19
560pF
INPUT1
G=2.5
PWM-stage1
OU T 1
C2
1nF
INTEGRATOR1
PREAMPLIFIER1
3
L1 30 m
C18 330pF
C10
220nF
12
11
C3
100nF
C4
100nF
13
R14 22K
OSC
8
EXT_CK
16
R1 10K
C17
24pF
R13
10K
-V CC
1
C16 330pF
C7 100nF
15
-V CC
25
R 6.8
PREAMPLIFIER2
23
R12 22K
L 2 30
m
OU T 2
C5 330nF
INTEGRATOR2
INPUT2
G=2.5
PWM-stage2
C14
33nF
C15
560pF
R11
100
C29
220nF
18
21
C6
1nF
19
17
2 0
2 4
2 2
C8 470pF
R5 4.7K
-V CC
R6
68K
C9 470pF
C28
2200
C11
100nF
C12
2200
m
F
m
F
-V CC
+V CC
D98AU978A
R9 52.3K
December 1999
1/9
This is preliminary information on a new product now in development. Details are subject to change without notice.
25W + 25W OUTPUT POWER:
R L = 8 W /4 W; THD = 10%
HIGH EFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (FROM
±
10 TO
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TDA7490
Figure 2. Test and application circuit. (Bridge Configuration)
470pF
470pF
R5 52.3K
C40
R4
68K
C41
The LC filter is optimized for 8
W
in single-ended)
It hos to be changed for other loads
W
7
9
-
L9 30
m
IN PUT
10
Int.
PWM-stage
3
PRE
+
C26
470nF
dumping
(common
mode)
C23
235nF
R27
10
R63
4.7K
R25
Rload
R28
10
C24
235nF
C29
470nF
PRE
+
23
18
Int.
PWM-stage
-
L10 30
m
19
17
470pF
470pF
C60
R61
68K
C59
R62 52.3K
D99AU1081
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V CC
DC Supply Voltage (no signal)
±
30
V
P tot
Power Dissipation T case = 70°C
35
W
T stg , T j
Storage and Junction Temperature
–40 to 150
°C
T op
Operating Temperature Range
0 to 70
°C
V 6,8,10,18
Maximum Voltage on pins # 6,8,10,18 referred to GND
±
5
V
THERMAL DATA
Symbol
Parameter
Typ.
Max.
Unit
R th j-case
Thermal Resistance Junction-case
1
°C/W
2/9
(<->LC filter for 4
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TDA7490
PIN CONNECTION (Top view)
1
25
D97AU816B
PIN FUNCTIONS
N.
Name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
-V CC sign/sub
-V CCpow1
out 1
+V CCpow1
BOOT1
STBY-MUTE
FEED1
OSC
FEED2
IN1
T1
+5V
GND
CURREF
T2
-5V
FEED3
IN2
FEED4
NC
BOOT2
+V CCpow2
OUT2
-V CCpow2
V reg
Negative signal/substrate supply
Negative power supply CH1
PWM output of CH1
Positive power supply CH1
Bootstrap CH1
Control State Pin
Feedback pin 1 CH1
Master Oscillator Setting Freequency Pin (or external sync.)
Feedback pin2 CH1
Input CH1
Triangular waveform CH1
+5V regulator (only for internal purposes)
Signal ground
Setting current resistor
Triangular waveform CH2
-5V regulator (only for internal purposes)
Feedback pin1 CH2
Input CH2
Feedback pin2 CH2
Not connected
Bootstrap CH2
Positive power supply CH2
PWM output of CH2
Negative power supply CH2
10V regulator
3/9
11040357.132.png 11040357.134.png
TDA7490
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V CC = ± 21V; RL = 8 W ; Demod. filter L =
30mH, C = 220nF; f = 1KHz; fsw = 200kHz; Tamb = 25°‘C unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V S
Supply Range
±
10
±
25
V
I q
Total Quiescent Current
R L =
¥
no LC filter
70
120
mA
V OS
Output Offset Voltage
–150
+150
mV
P O
Output Power
THD = 10%
THD = 1%
25
18
W
W
P O(BTL)
Output Power in Bridge
Configuration
Vs =
±
22V; R L = 16
W
THD = 10%
THD = 1%
50
40
W
W
Vs =
±
17V; R L = 8
W
THD = 10%
THD = 1%
50
40
W
W
P O (1)
Output Power
R L = 4
W
V CC =
±
16V
THD = 10%
THD = 1%
25
18
W
W
P D
Maximum Dissipated Power
W
P O = 25W + 25W; THD = 10%
±
21V; R L = 8
6
W
h
(2)
Efficiency (*)
P O = 25W + 25W
89
%
THD
Total Harmonic Distortion
R L = 8
W
; P O = 1W
0.1
%
I max
Overcurrent Protection
Threshold
R L = 0
3.5
5
A
T j
Thermal Shut-down Junction
Temperature
150
°C
G V
Closed Loop Gain
30
dB
D
G V (3)
Gain Matching
-1
+1
dB
e N
Total Input Noise
R G = 50
A Curve
f = 20Hz to 22KHz
7
12
m
V
W
m
V
C T
Cross talk
f = 1KHz, P O = 1W
55
dB
R i
Input Resistance
30
k
W
SVR
Supply Voltage Rejection
f = 100Hz; V r = 0.5
60
dB
V rmax
Overvoltage Threshold (5)
55
60
V
T r , T f
Rising and Falling Time
50
ns
R DSON
Power Transistor on Resistance
0.4
W
F SW (4)
Switching Frequency Range
100
200
230
KHz
MUTE & STAND-BY FUNCTIONS
V ST-BY
Stand-by range
0
0.7
V
V MUTE
Mute Range
1.7
2.5
V
V PLAY
Play Range
4
5
V
A MUTE
Mute Attenuation
60
dB
I qST-BY
Quiescent Current @ Stand-by
3
mA
*: P O = measured across the load using the following inductor:
COIL58120 MPPA 2 (magnectics) TURNS = 20 ø 1mm
(1) L = 15
m
H, C = 470nF
(2) h
Top = 90% where V CC = ± 25V; R L = 8 W ; P O = 43W + 43W; THD = 20%
Gv is intended with R2, R17, R5, R9 1% precision
(4) F SW = 0.25
D
(1/(300ns + R13
( C17 + 76pF)
0.85)
(5) V RMAX = (+V CC ) - (-V CC ) when V R
³
V RMAX the device goes in Stand-By mode
4/9
V CC =
(3)
×
×
×
11040357.135.png 11040357.136.png
TDA7490
Figure 3. P.C. Board and component layout of the Figs. 1, 2.
(for Stereo and Bridge compatible configuration)
C
O
M
P
O
N
E
N
T
S
I
D
E
S
O
L
D
E
R
S
I
D
E
5/9
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