tda7256, Ham- CB Radio, Karty katalogowe
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TDA7256
30W BRIDGE FULLY PROTECTED
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
MULTIWATT 11
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
April 1995
1/10
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
W
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
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
W
18
22
26
30
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
3/10
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
4/10
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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