tda7385, Ham- CB Radio, Karty katalogowe
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TDA7385
4 x 22W FOUR BRIDGE CHANNELS CAR RADIO AMPLIFIER
@ 13.2V, 1KHz, 10%
CLIPPING DETECTOR
LOW DISTORTION
LOW OUTPUT NOISE
ST-BY FUNCTION
MUTE FUNCTION
AUTOMUTE AT MIN. SUPPLY VOLTAGE DE-
TECTION
DIAGNOSTICS FACILITY FOR:
– CLIPPING
– OUT TO GND SHORT
– OUT TO V
S
SHORT
– THERMAL SHUTDOWN
LOW EXTERNAL COMPONENT COUNT:
– INTERNALLY FIXED GAIN (26dB)
– NO EXTERNAL COMPENSATION
– NO BOOTSTRAP CAPACITORS
PROTECTIONS:
OUTPUT SHORT CIRCUIT TO GND, TO V
S
,
ACROSS THE LOAD
W
FLEXIWATT25
ORDERING NUMBER:
TDA7385
VERY INDUCTIVE LOADS
OVERRATING CHIP TEMPERATURE WITH
SOFT THERMAL LIMITER
LOAD DUMP VOLTAGE
FORTUITOUS OPEN GND
REVERSED BATTERY
ESD PROTECTION
DESCRIPTION
The TDA7385 is a new technology class AB
Audio Power Amplifier in Flexiwatt 25 package
designed for high end car radio applications.
BLOCK AND APPLICATION DIAGRAM
Vcc1
Vcc2
2.200
m
F
100nF
ST-BY
MUTE
DIAGN. OUT
IN1
OUT1+
OUT1-
0.1
m
F
PW-GND
IN2
OUT2+
OUT2-
0.1
m
F
PW-GND
IN3
OUT3+
OUT3-
0.1
m
F
PW-GND
IN4
OUT4+
OUT4-
0.1
m
F
PW-GND
AC-GND
0.1
SVR
TAB
S-GND
m
F
47
m
F
D93AU002C
May 1997
1/12
HIGH OUTPUT POWER CAPABILITY:
4 x 30W max./4
W
EIAJ
4 x 22W/4
W
@ 14.4V, 1KHz, 10%
4 x 18.5W/4
TDA7385
DESCRIPTION
(continued)
Thanks to the fully complementary PNP/NPN out-
put configuration the TDA7385 allows a rail to rail
output voltage swing with no need of bootstrap
capacitors. The extremely reduced components
count allows very compact sets.
The on-board clipping detector simplifies gain
compression operations. The fault diagnostics
makes it possible to detect mistakes during Car-
Radio assembly and wiring in the car.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Operating Supply Voltage
18
V
V
CC (DC)
DC Supply Voltage
28
V
V
CC (pk)
Peak Supply Voltage (t = 50ms)
50
V
I
O
Output Peak Current:
Repetitive (Duty Cycle 10% at f = 10Hz)
Non Repetitive (t = 100
4.5
5.5
A
A
m
s)
P
tot
Power dissipation, (T
case
=70
°
C)
80
W
T
j
Junction Temperature
150
°
C
T
stg
Storage Temperature
– 55 to 150
°
C
PIN CONNECTION
(Top view)
1
25
D94AU117B
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-case
Thermal Resistance Junction to Case
Max.
1
°
C/W
2/12
TDA7385
ELECTRICAL CHARACTERISTICS
(V
S
= 14.4V; f = 1KHz; R
g
= 600
W
;R
L
=4
W
;T
amb
=25
°
C;
Refer to the Test and application circuit (fig.1), unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
q1
Quiescent Current
180
mA
V
OS
Output Offset Voltage
150
mV
G
v
Voltage Gain
25
26
27
dB
P
o
Output Power
THD = 10%
THD = 1%
18
22
18
W
W
THD = 10%; V
S
= 14V
THD = 5%; V
S
= 14V
THD = 1%; V
S
= 14V
21
19
17
W
W
W
THD = 10%; V
S
= 13.2V
THD = 1%; V
S
= 13.2V
18.5
15
W
W
P
o max
Max. Output Power
EIAJ RULES
30
W
THD
Distortion
P
o
= 4W
0.3
%
e
No
Output Noise
”A” Weighted
Bw = 20Hz to 20KHz
50
65
m
V
150
m
V
SVR
Supply Voltage Rejection
f = 100Hz
50
65
dB
f
cl
Low Cut-Off Frequency
20
Hz
f
ch
High Cut-Off Frequency
75
KHz
R
i
Input Impedance
70
100
K
W
C
T
Cross Talk
f = 1KHz
50
70
dB
I
SB
St-By Current Consumption
St-By = LOW
100
m
A
V
SB out
St-By OUT Threshold Voltage
(Amp: ON)
3.5
V
V
SB IN
St-By IN Threshold Voltage
(Amp: OFF)
1.5
V
A
M
Mute Attenuation
V
O
= 1Vrms
90
dB
V
M out
Mute OUT Threshold Voltage
(Amp: Play)
3.5
V
V
Min
Mute IN Threshold Voltage
(Amp: Mute)
1.5
V
I
m (L)
Muting Pin Current
V
MUTE
= 1.5V
(Source Current)
10
13
16
m
A
I
m (H)
Muting Pin Current
VMUTE = 3.5V
(Source Current)
6
10
14
m
A
I
CDOFF
Clipping Detector ”OFF” Output
Average Current
THD = 1% (*)
100
m
A
I
CDON
Clipping Detector ”ON” Output
Average Current
THD = 10% (*)
190
m
A
(*) Diagnostics output pulled-up to 5V with 10K
W
series resistor.
3/12
TDA7385
Figure 1:
Standard Test and Application Circuit
C8
0.1
m
F
C7
2200
m
F
Vcc1-2
Vcc3-4
R1
6
20
ST-BY
4
9
8
7
10K
C9
1
OUT1
m
R2
MUTE
22
47K
C10
1
m
5
2
3
C1
OUT2
IN1
11
0.1
m
F
IN2
12
17
18
19
C2 0.1
m
F
OUT3
IN3
15
C3 0.1
m
F
21
24
23
IN4
14
OUT4
C4 0.1
m
F
S-GND
13
16
10
25
1
SVR
TAB
C5
0.1
m
F
C6
47
m
F
D94AU179B
DIAGNOSTICS
4/12
F
F
TDA7385
Figure 2:
P.C.B. and component layout of the figure 1 (1:1 scale)
COMPONENTS &
TOP COPPER LAYER
TDA7385
BOTTOM COPPER LAYER
5/12
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