ST TDA7350A User Manual
TDA7350A
Fi
22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO
1 General Features
■ VERY FEW EXTERNAL COMPONENTS
■ NO BOUCHEROT CELLS
■ NO BOOSTRAP CAPACITORS
■ HIGH OUTPUT POWER
■ NO SWITCH ON/OFF NOISE
■ VERY LOW STAND-BY CURRENT
■ FIXED GAIN (30dB STEREO)
■ PROGRAMMABLE TURN-ON DELAY
1.1 PROTECTIONS
■ OUTPUT AC-DC SHORT CIRCUIT TO
GROUND AND TO SUPPLY VOLTAGE
■ VERY INDUCTIVE LOADS
■ LOUDSPEAKER PROTECTION
■ OVERRATING CHIP TEMPERATURE
■ LOAD DUMP VOLTAGE
■ FORTUITOUS OPEN GROUND
■ ESD
2 Description
The TDA7350A is a new technology class AB Au-
gure 1. Package
Multiwatt11
Table 1. Order Codes
Part Number Package
TDA7350A Multiwatt11
dio Power Amplifier in the Multiwatt® package designed for car radio applications.
Thanks to the fully complementary PNP/NPN output configuration the high power performance of
the TDA7350A is obtained without bootstrap capacitors.
A delayed turn-on mute circuit eliminates audible
on/off noise, and a novel short circuit protection
system prevents spurious intervention with highly
inductive loads.
Figure 2. Application Circuit (Bridge)
February 2005
Rev. 1
1/23
TDA7350A
Figure 3. Pin connection (Top view)
Table 2. Absolute Maximum Ratings
Symbol Parameter Value Unit
V
V
V
I
O
I
O
P
tot
T
stg
Operating Supply Voltage 18 V
S
DC Supply Voltage 28 V
S
Peak Supply Voltage (t = 50ms) 40 V
S
Output Peak Current (non rep. t = 100µs) 5 A
Output Peak Current (rep. freq. > 10Hz) 4 A
Power Dissipation at T
= 85°C 36 W
case
, TjStorage and Junction Temperature -40 to 150 °C
Table 3. Thermal Data
Symbol Parameter Value Unit
R
thj-case
Thermal Resistance Junction-case Max. 1.8 °C/W
Table 4. Electrical Characteristcs
(Refer to the test circuits, T
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
Supply Voltage Range 8 18 V
S
Total Quiescent Drain Current stereo configuration 120 mA
I
d
A
I
T
Stand-by attenuation 60 80 dB
SB
Stand-by Current 100 µA
SB
Thermal Shut-down Junction
sd
Temperature
= 25°C, VS = 14.4V, f = 1KHz unless otherwise specified)
amb
150 °C
2/23
TDA7350A
Table 4. Electrical Characteristcs (continued)
(Refer to the test circuits, T
Symbol Parameter Test Condition Min. Typ. Max. Unit
STEREO
P
Output Power (each channel) d = 10%
o
d Distortion Po = 0.1 to 4W; R
SVR Supply Voltage Rejection R
Crosstalk f = 1KHz
C
T
RI Input Resistance 30 50 KΩ
Voltage Gain 27 29 31 dB
G
V
Voltage Gain Match 1 dB
G
V
Input Noise Voltage Rg= 50Ω(*)
E
IN
BRIDGE
Output Power d = 10%; RL= 4Ω
P
o
d Distortion P
Output Offset Voltage 250 mV
V
OS
SVR Supply Voltage Rejection R
Input Resistance 50 KΩ
R
I
Voltage Gain 33 35 37 dB
G
V
Input Noise Voltage Rg= 50Ω(*)
E
IN
(*) Curve A
(**) 22Hz to 22KHz
= 25°C, VS = 14.4V, f = 1KHz unless otherwise specified)
amb
= 2Ω
R
L
RL= 3.2Ω
R
= 4Ω
L
d = 10%; V
R
= 2Ω
L
= 13.2V
S
7
RL= 3.2Ω
R
= 4Ω
L
= 3.2Ω 0.5 %
L
= 10kΩ f = 100Hz
g
C3 = 22µF
45 50
C3 = 100µF
45 55
f = 10KHz
R
= 10KΩ(*)
g
R
= 50Ω(**)
g
Rg= 10KΩ(**)
16 20
d = 10%; R
d = 10%; V
= 3.2Ω
L
= 13.2V
S
RL= 4Ω
R
= 3.2Ω
L
= 0.1 to 10W; RL = 4W 1 %
o
= 10kΩ f = 100Hz
g
C3 = 22µF
45 50
C3 = 100µF
R
= 10KΩ(*)
g
R
= 50Ω(**)
g
Rg= 10KΩ(**)
11
8
6.5
9
6.5
5.5
57
50
1.5
2
2
2.7
22
17.5
19
57
2
2.5
2.7
3.2
7 µV
W
W
W
W
W
W
dB
dB
dB
dB
µV
µV
µV
W
W
W
W
dB
dB
µV
µV
µV
µV
3/23
TDA7350A
Figure 4. STEREO Test and Appication Circuit
Figure 5. P.C. Board and Layout (STEREO) of the circuit of fig. 4
4/23
Figure 6. BRIDGE Test and Appication Circuit
Figure 7. P.C. Board and Layout (BRIDGE) of the circuit of fig. 6
TDA7350A
5/23
TDA7350A
Table 5. Recommended Values of the External Components
(ref. to the Stereo Test and Application Circuit)
Component
C1 0.22µF Input
C2 0.22µF Input Decoupling
C3 100µF Supply Voltage
C4 22µF Stand-By
C5 220µF (min) Supply By-Pass Danger of Oscillations
C6 100nF (min) Supply By-Pass Danger of Oscillations
C7 2200µF Output
Recommended
Val ue
Purpose
Decoupling (CH1)
(CH2)
Rejection
Filtering
Capacitor
ON/OFF Delay
Decoupling
CH2
Figure 8. Output Power vs. Supply Voltage (Stereo)
Larger than the Recomm.
Value
——
——
Longer Turn-On Delay
Time
Delayed Turn-Off by StandBy Switch
- Decrease of Low Frequency
Cut Off
- Longer Turn On Delay
Smaller than the Recomm.
Worse Supply Voltage
Rejection.
Shorter Turn-On Delay Time
Danger of Noise (POP)
Danger of Noise (POP)
- Increase of Low Frequency
Cut Off
- Shorter Turn On Delay
Figure 10. Output Power vs. Supply Voltage (Stereo)
Val ue
Figure 9. Output Power vs. Supply Voltage (Stereo)
6/23
Figure 11. Output Power vs. Supply Voltage (Bridge)
TDA7350A
Figure 12. Output Power vs. Supply Voltage (Bridge)
Figure 13. Drain Current vs Supply Voltage (Stereo)
Figure 15. Distortion vs Output Power (Stereo)
Figure 16. Distortion vs Output Power (Stereo)
Figure 14. Distortion vs Output Power (Stereo)
Figure 17. Distortion vs Output Power (Bridge)
7/23
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