Philips TDA7490 Service Manual
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TDA7490 |
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25W + 25W STEREO CLASS-D AMPLIFIER |
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50W MONO IN BTL |
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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
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 |
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R17 52.3K |
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MUTE |
STBY |
R2 |
C26 470pF C25 470pF |
+VCC |
-VCC |
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+VCC |
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30K |
R21 4.7K |
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R3 |
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C27 |
R20 |
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R4 |
C23 |
C22 |
C21 |
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-VCC |
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68K |
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130K |
2200 F |
100nF |
2200 F |
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10K |
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2.2 F |
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6 |
7 |
9 |
14 |
2 |
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4 |
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R15 |
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100 |
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C1 330nF |
10 |
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5 |
C20 |
C19 |
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INPUT1 |
G=2.5 |
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PWM-stage1 |
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33nF |
560pF |
OUT1 |
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C2 |
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INTEGRATOR1 |
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3 |
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L1 30 |
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1nF |
PREAMPLIFIER1 |
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C18 330pF |
C10 |
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12 |
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220nF |
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11 |
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C3 |
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R14 22K |
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100nF |
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13 |
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C4 |
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OSC |
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8 |
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EXT_CK |
100nF |
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16 |
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R1 10K |
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C17 |
R13 |
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24pF |
10K |
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-VCC |
1 |
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C16 330pF |
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C7 100nF |
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15 |
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-VCC |
25 |
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R 6.8 |
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23 |
R12 22K |
L2 30 |
OUT2 |
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C5 330nF |
PREAMPLIFIER2 |
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INTEGRATOR2 |
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INPUT2 |
18 |
G=2.5 |
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PWM-stage2 |
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21 |
C14 |
C15 |
C29 |
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C6 |
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33nF |
560pF |
220nF |
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1nF |
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19 |
17 |
20 |
24 |
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22 |
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R11 |
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100 |
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C8 470pF |
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R5 4.7K |
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-VCC |
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R6 |
C9 470pF |
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C28 |
C11 |
C12 |
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68K |
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2200 F |
100nF |
2200 F |
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-VCC |
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+VCC |
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R9 52.3K |
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D98AU978A |
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March 2001 |
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1/9 |
TDA7490
Figure 2. Test and application circuit. (Bridge Configuration)
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470pF |
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470pF |
R5 52.3K |
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C40 |
R4 |
C41 |
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The LC filter is optimized for 8Ω |
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68K |
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(<->LC filter for 4Ω in single-ended) |
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It hos to be changed for other loads |
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7 |
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9 |
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INPUT |
10 |
- |
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PWM-stage |
L9 30µ |
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Int. |
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PRE |
+ |
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3 |
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C26 |
dumping |
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C23 |
470nF |
(common |
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mode) |
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235nF |
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R27 |
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R63 |
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10 |
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4.7K |
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R25 |
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Rload |
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R28 |
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C24 |
10 |
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235nF |
C29 |
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PRE |
+ |
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470nF |
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18 |
Int. |
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PWM-stage |
L10 30µ |
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- |
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19 |
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17 |
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470pF |
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470pF |
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C60 |
R61 |
C59 |
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68K |
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R62 52.3K |
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D99AU1081 |
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ABSOLUTE MAXIMUM RATINGS
Symbol |
Parameter |
Value |
Unit |
VCC |
DC Supply Voltage (no signal) |
±30 |
V |
Ptot |
Power Dissipation Tcase = 70°C |
35 |
W |
Tstg, Tj |
Storage and Junction Temperature |
–40 to 150 |
°C |
Top |
Operating Temperature Range |
0 to 70 |
°C |
V6,8,10,18 |
Maximum Voltage on pins # 6,8,10,18 referred to GND |
±5 |
V |
THERMAL DATA
Symbol |
Parameter |
Typ. |
Max. |
Unit |
Rth j-case |
Thermal Resistance Junction-case |
1 |
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°C/W |
2/9
TDA7490
PIN CONNECTION (Top view)
1 |
25 |
-V |
-V |
OUT1 |
+V |
BOOT1 |
-STBYMUTE |
FEED1 |
OSC |
FEED2 |
IN1 |
T1 |
+5V |
GND |
CURREF |
T2 |
-5V |
FEED3 |
IN2 |
FEED4 |
N.C. |
D97AU816B |
-V |
Vreg |
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CC |
CC |
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CC |
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BOOT2 |
+V |
OUT2 |
CC |
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CC |
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PIN FUNCTIONS
N. |
Name |
Function |
1 |
-VCC sign/sub |
Negative signal/substrate supply |
2 |
-VCCpow1 |
Negative power supply CH1 |
3 |
out 1 |
PWM output of CH1 |
4 |
+VCCpow1 |
Positive power supply CH1 |
5 |
BOOT1 |
Bootstrap CH1 |
6 |
STBY-MUTE |
Control State Pin |
7 |
FEED1 |
Feedback pin 1 CH1 |
8 |
OSC |
Master Oscillator Setting Freequency Pin (or external sync.) |
9 |
FEED2 |
Feedback pin2 CH1 |
10 |
IN1 |
Input CH1 |
11 |
T1 |
Triangular waveform CH1 |
12 |
+5V |
+5V regulator (only for internal purposes) |
13 |
GND |
Signal ground |
14 |
CURREF |
Setting current resistor |
15 |
T2 |
Triangular waveform CH2 |
16 |
-5V |
-5V regulator (only for internal purposes) |
17 |
FEED3 |
Feedback pin1 CH2 |
18 |
IN2 |
Input CH2 |
19 |
FEED4 |
Feedback pin2 CH2 |
20 |
NC |
Not connected |
21 |
BOOT2 |
Bootstrap CH2 |
22 |
+VCCpow2 |
Positive power supply CH2 |
23 |
OUT2 |
PWM output of CH2 |
24 |
-VCCpow2 |
Negative power supply CH2 |
25 |
Vreg |
10V regulator |
3/9
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