tda7391, Ham- CB Radio, Karty katalogowe
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TDA7391
32W BRIDGE CAR RADIO AMPLIFIER
@V
S
= 14.4V, f = 1KHz, d = 10%
26W/4
W
@V
S
= 14.4V, f = 1KHz, d = 10%
DIFFERENTIAL INPUTS (EITHER SINGLE
ENDED OR DIFFERENTIAL INPUT SIGNAL
ARE ACCEPTED)
MINIMUM EXTERNAL COMPONENT COUNT:
- NO BOOTSTRAP CAPACITORS
- NO BOUCHEROT CELLS
- INTERNALLY FIXED GAIN (30dB)
- NO SVR CAPACITOR
ST.-BY FUNCTION (CMOS COMPATIBLE)
PROGRAMMABLE TURN-ON/OFF DELAY
NO AUDIBLE POP DURING MUTE AND ST-
BY OPERATIONS
W
Multiwatt11
ORDERING NUMBER:
TDA7391
DESCRIPTION
The TDA7391 is a BRIDGE class AB audio power
amplifier specially intended for car radio High
Power applications.
The high power capability together with the possi-
bility to operate either in DIFFERENTIAL INPUT
MODE or SINGLE ENDED INPUT MODE makes
it suitable for boosters and high end car radio
equipments.
The exclusive fully complementary output stage
and the internal fixed gain configuration drop the
external component count.
The on board clipping detector allows easy imple-
mentation of gain compression systems.
PROTECTIONS:
SHORT CIRCUIT (TO GND, TO V
S,
ACROSS
THE LOAD)
VERY INDUCTIVE LOADS
CHIP OVERTEMPERATURE
LOAD DUMP
OPEN GND
ESD
Figure 1:
Test And Application Circuit
+V
S
C2 0.22
F
C5 100nF
C4 1000
m
F
m
IN+
2
3
9
OUT+
7
C1 0.22
m
F
IN-
1
TDA7391
OUT-
5
Vref
V
S
SW1
8
CD
R1
4.7K
W
ST-BY
4
TO
m
C
11
10
6
R2
56K
GND
C3
33
m
F
W
D94AU133
April 1995
1/8
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
HIGH POWER CAPABILITY:
40W/3.2
W
EIAJ
32W/3.2
TDA7391
Figure 2:
Block Diagram
V
CC1
V
CC2
3
9
+
-
REFERENCES
SHORT CIRCUIT
DUMP & THERMAL
PROTECTION
STANDBY THRESHOLD
1
IN-
5
OUT-
POWER AMP
COMMON
MODE
ICM
-
+
LTS
V=f (Tj)
LTS
DISABLE
4
CD
V
CC/2
-
+
gm
POWER AMP
7
2
OUT+
IN+
THD
DETECT
V
S
+
-
PROGRAMMABLE
CURRENT CIRCUIT
MUTE THRESHOLD
11
10
6
8
MUTE
SYNC
GND
STANDBY
D94AU134
PIN CONNECTION
(Top view)
11
MUTE
SYNC
+V
S
STAND-BY
OUT+
GND
OUT-
CD
+V
S
IN+
IN-
10
9
8
7
6
5
4
3
2
1
TAB CONNECTED TO PIN 6
D94AU135
THERMAL DATA
Symbol
Description
Value
Unit
R
th j-case
Thermal Resistance Junction-case
Max
1.8
°
C/W
2/8
TDA7391
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
DC Supply Voltage
28
V
V
OP
Operating Supply Voltage
18
V
V
PEAK
Peak Supply Voltage (t = 50ms)
50
V
I
O
Output Peak Current repetitive (f > 10Hz)
Output Peak Current non repetitive
4.5
6
A
A
P
tot
Power Dissipation (T
CASE
=85
°
C)
43
W
T
stg
,T
j
Storage and Junction-Case Temperature
-40 to 150
°
C
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 Range
8
18
V
I
q
Total Quiescent Current
60
150
mA
V
OS
Output Offset Voltage
120
mV
I
SB
ST-BY Current
V
ST-BY
= 1.5V
100
m
A
I
SBin
ST-BY Input Bias Current
V
ST-BY
=5V
10
m
A
V
SBon
ST-BY On Threshold Voltage
1.5
V
V
SBoff
ST-BY Off threshold Voltage
3.5
V
ATT
ST-BY
ST-BY Attenuation
90
dB
I
Min
Mute Input Bias Current
(V
MUTE
= 5V)
10
m
A
A
M
Mute Attenuation
90
dB
P
O
RMS Output Power
d = 10%
d=1%
d = 10%; R
L
= 3.2
20
26
21
32
W
W
W
W
EIAJ Output Power
V
S
= 13.7V
40
W
d
Distortion
P
O
= 0.1 to 15W
0.06
0.03
%
%
G
V
Voltage Gain
29.5
30
30.5
dB
f
H
High Frequency rolloff
P
O
= 1W; -3dB
75
KHz
R
IN
Input Impedance
Differential
36
60
K
W
Single Ended
30
55
K
W
E
IN
Input Noise Voltage
R
g
=0
W
;f=
22Hz to 22KHz
4
mV
CMRR
Input Common Mode Rejection
f = 1KHz; V
IN
= 1Vrms
65
dB
SVR
Supply Voltage Rejection
R
g
=0
W
;V
r
= 1Vrms
60
dB
CDL
Clipping Detection Level
5
10
15
%
T
sd
Absolute Thermal Shutdown
Junction Temperature
160
°
C
3/8
TDA7391
FUNCTIONAL DESCRIPTION
Pin
Function
Description
1, 2
INPUTS
The input stage is a high impedance type also capable of operation in single ended mode
with one input capacitively coupled to the signal GND. The impedance seen by the
inverting and non inverting input pins must be matched.
3,9
+V
S
Supply Voltage.
4
CD
The TDA7391 is equipped with a diagnostic circuitry able to detect the clipping in the
Output Signal (distortion = 10%).
The CD pin (open collector) gives out low level signal during clipping.
.
It consists of two class AB fully complementary PNP/NPN stages fully protected.
A rail to rail output voltage swing is achieved without need of bootstrap capacitors.
No external compensation is necessary.
W
5, 7
OUTPUTS
6
GND
Ground.
8
STAND-BY
The device features a ST-BY function which shuts down all the internal bias supplies
when the ST-BY pin is low.
In ST-BY mode the amplifier sinks a small current (in the range of few
m
A).
When the ST-BY pin is high the IC becomes fully operational.
10
SYNC
A resistor (R
2
) has to be connect between pin 10 and GND in order to program the current
that flows in the C
3
capacitor (pin 11). The values of C
3
and R
2
determine the time
required to bias the amplifier.
11
MUTE
The pin will have a capacitor (C
3
) tied to GND to set the MUTE/STAND-BY time. An
automatic Mute during turn on/off is provided to prevent noisy transients.
Figure 3:
P.C. Board and Component Layout of the Fig. 1 (1:1 scale).
4/8
The output stage is a bridge type able to drive loads as low as 3.2
TDA7391
Figure 4:
Quiescent Current vs Supply Voltage
Figure 5:
EIAJ power vs Supply Voltage
R
L
= 3.2
W
R
L
=4
W
Figure 6:
Output Power vs Supply Voltage
(@ R
L
=4
Figure 7:
Distortion vs Frequency (@ R
L
=4
W
)
W
W
f = 1KHz
V
S
= 14.4V
R
L
=4
f = (Hz)
Figure 8:
Output Power vs Supply Voltage
(@ R
L
=3.2
W
)
Figure 9:
Distortion vs Frequency (R
L
=4
W
)
W
f = 1KHz
V
S
= 14.4V
R
L
= 3.2
f = (Hz)
5/8
)
R
L
=4
W
P
O
= 12W
R
L
= 3.2
W
P
O
= 15W
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