TDA7256.pdf

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TDA7256
30W BRIDGE CAR RADIO AMPLIFIER
NO AUDIBLE POP DURING MUTE AND
STANDBY OPERATIONS
MUTING TTL COMPATIBLE
VERY LOW STANDBY CONSUMPTION
PROGRAMMABLE TURN ON DELAY
DIFFERENTIAL INPUT
SHORT CIRCUIT PROTECTIONS:
RL SHORT - OUT TO GROUND - OUT TO V S
OTHER PROTECTIONS:
- Load dump voltage surge
- Loudspeaker DC current
- Very inductive load
- Overrating temperature
- Open ground
MULTIWATT11
ORDERING NUMBER: TDA7256
tions. The high current capability allows to drive
low impedance loads (up to 2
DESCRIPTION
The TDA7256 is a class AB fully protected bridge
power amplifier, designed for car radio applica-
). The differential
inputs availability makes it particularly suitable for
boosters and active loudspeakers applications.
BLOCK DIAGRAM
October 1998
1/10
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
W
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TDA7256
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Test Conditions
Unit
V S
Operating Supply Voltage
18
V
V S
DC Supply Voltage
28
V
V S
Peak Supply Voltage (for 50ms)
40
V
I o
Output Peak Current (non repetiitive t = 0.1ms)
internally limited
I o
Output Peak Current Repetitive f > 10Hz
5.5
A
P tot
Power Dissipation (Tcase = 85
°
C)
36
W
T stg, T J
Storage and Junction Temperature Range
-40 to +150
°
C
THERMAL DATA
Symbol
Description
Value
Unit
R th j-case
Thermal Resistance Junction-case
Max
1.8
°
C/W
2/10
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TDA7256
ELECTRICAL CHARACTERISTICS (V S = 14.4V, R L =4 W , f = 1KHz; T amb =25
°
C, unless otherwise
specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V S
Supply Voltage
8
18
V
I q
Quiescent Drain Current
80
150
mA
R i
Input Resistance
50
K
W
CMR
Common Mode Rejection
f = 1KHz, V in = 100mV
60
dB
V OS
Output Offset Voltage
150
mV
P o
Output Power
d = 10%
R L =4
W
R L = 3.2
18
22
26
30
W
W
W
W
R L =2
W
d
Distortion
P o = 0.1W to 13W
0.05
0.5
%
G V
Voltage Gain (CL)
36
dB
e N
Total Input Noise Voltage
R g = 10K
W
, B = 22Hz to 22KHz
3
10
m
V
SVR
Supply Voltage Rejection
R g = 10K
W
,V r = 1Vrms,
45
60
dB
f = 300Hz
Muting Attenuation
V ref = 1Vrms,
f = 100Hz to 10KHz
60
dB
Muting-in Threshold Voltage
Pin 1
2.4
V
Muting-out Threshold Voltage
Pin 1
0.8
V
Stand-by Attenuation
Vref = 1Vrms
60
dB
Stand-by Current Consumption
100
m
A
T SD
Thermal Shut-down Junction
Temperature
145
° C
Figure 1: Test and Application Circuit
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TDA7256
Figure 2: P.C. and Layout of the fig.1 (1:1 scale)
Figure 3: Drain Current vs. Supply Voltage
Figure 4: Output Power vs. Supply Voltage
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TDA7256
Figure 5: Output Power vs. Supply Voltage
Figure 6: Output Power vs. Supply Voltage
Figure 7: Distortion vs. Output Power
Figure 8: Distortion vs. Output Power
Figure 9: Distortion vs. Output Power
Figure 10: Distortion vs. Frequency
5/10
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