E-TDA7396 [STMICROELECTRONICS]
45W/2W BRIDGE CAR RADIO AMPLIFIER WITH DIAGNOSTIC FACILITY; 45W / 2W桥汽车收音机与诊断设备放大器
| 型号： | E-TDA7396 |
| 厂家： | 
ST |
| 描述： | 45W/2W BRIDGE CAR RADIO AMPLIFIER WITH DIAGNOSTIC FACILITY |
| 文件： | 总11页 (文件大小：285K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TDA7396
®
45W/2Ω BRIDGE CAR RADIO AMPLIFIER
WITH DIAGNOSTIC FACILITY
HIGH POWER CAPABILITY:
- 65W/2 MAX
Ω
- 60W/2 EIAJ
Ω
- 45W/2 @ VS = 14.4V, f = 1KHz, d = 10%
Ω
DIFFERENTIAL INPUTS (EITHER SINGLE
ENDED OR DIFFERENTIAL INPUT SIGNALS
ARE ACCEPTED)
MINIMUM EXTERNAL COMPONENT COUNT:
- NO BOOTSTRAP CAPACITORS
- NO BOUCHEROT CELLS
Multiwatt11
ORDERING NUMBER: TDA7396
- INTERNALLY FIXED GAIN (26dB)
- NO SVR CAPACITOR
SHORT CIRCUIT
ST.-BY FUNCTION (CMOS COMPATIBLE)
AUTOMATIC MUTE DURING TURN-ON/OFF
AUTOMUTE AT MINIMUM SUPPLY
VOLTAGE DETECTION
OPEN LOAD
THERMAL SHUTDOWN
PROTECTIONS:
SYNCHRONIZING PIN FOR SIMULTANEOUS
TURN-ON IN MULTI-DEVICE APPLICATIONS
NO AUDIBLE POP DURING MUTE AND ST-
BY OPERATIONS
SHORT CIRCUIT (TO GND, TO VS, ACROSS
THE LOAD)
VERY INDUCTIVE LOADS
CHIP OVER-TEMPERATURE
LOAD DUMP
OPEN GND
ESD
Diagnostic Facilities:
CLIPPING DETECTOR
Figure 1: Test And Application Circuit
+V
S
100nF
OUT+
1000µF
0.22µF
3
9
IN+
2
1
8
7
5
0.22µF
IN-
OUT-
TDA7396
Vref
STANDBY
TO µC or V
10KΩ
S
CD-DIA
4
TO µC
11
10
6
GND
RS
CM
10µF
51KΩ
D93AU004
September 2013
1/11
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA7396
DESCRIPTION
plications.
The exclusive fully complementary output stage
and the internally fixed gain configuration drop the
external component count.
The TDA7396 is a BRIDGE class AB audio power
amplifier especially intended for car radio High
Power applications.
The 2Ω 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 ap-
The on board clipping detector allows easy imple-
mentation of gain compression systems.
The diagnostics facility allows to detect any mis-
takes during car radio set assembly and wiring in
the car.
Figure 2: Block Diagram
VCC1 VCC2
3
9
SHORT CIRCUIT
DUMP & THERMAL
PROTECTION
+
-
REFERENCES
10K
STANDBY THRESHOLD
1
IN-
5
OUT-
POWER AMP
COMMON
MODE
500Ω
500Ω
ICM
-
4
7
V=f
(Tj)
LTS
DISABLE
LTS
DIAGN
CD
+
VCC/2
10K
-
POWER AMP
2
gm
+
OUT+
IN+
THD
DETECT
PROGRAMMABLE
CURRENT CIRCUIT
DIAGNOSTIC
CIRCUIT
+
-
MUTE THRESHOLD
11
MUTE
10
6
8
SYNC
GND
STANDBY
D94AU107
PIN CONNECTION (Top view)
11
MUTE
SYNC
+V
10
9
8
7
6
5
4
3
2
1
S
STAND-BY
OUT+
GND
OUT-
CD-DIA (CLIPPING DETECTOR - DIAG.)
+V
S
IN+
IN-
TAB CONNECTED TO PIN 6
D93AU003A
THERMAL DATA
Symbol
Description
Value
Unit
°C/W
Rth j-case
Thermal Resistance Junction-case
Max
1.5
2/11
TDA7396
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
28
Unit
V
VS
VOP
VPEAK
IO
DC Supply Voltage
Operating Supply Voltage
18
V
Peak Supply Voltage (t = 50ms)
50
V
Output Peak Current repetitive (f > 10Hz)
Output Peak Current non repetitive
6
7
A
A
Ptot
Power Dissipation (TCASE = 85°C)
43
W
Tstg, Tj
Storage and Junction-Case
-40 to 150
°C
ELECTRICAL CHARACTERISTICS (VS = 14.4V; RL = 2Ω, f = 1KHz, Tamb = 25°C, unless otherwise
specified)
Symbol
VS
Parameter
Supply Voltage Range
Total Quiescent Current
Output Offset Voltage
ST-BY Current
Test Condition
Min.
Typ.
Max.
Unit
V
8
18
Iq
100
mA
mV
µA
µA
V
VOS
150
100
10
ISB
VST-BY = 1.5V
VST-BY = 5V
ISBin
ST-BY Input Bias Current
ST-BY On Threshold Voltage
ST-BY Off threshold Voltage
ST-BY Attenuation
VSBon
VSBoff
ATTST-BY
1.5
3.5
V
90
90
dB
V
R
EXT/RS
Mute Resistor Ratio for External
Mute Control
(see Application Circuit of fig. 4) 0.63
VMUTE = 5V
0.69
10
IM in
AM
PO
Mute Input Bias Current
Mute Attenuation
µA
dB
RMS Output Power
d = 10%
45
35
27
W
W
W
d = 1%
d = 10%; RL = 4Ω
EIAJ Output Power
Distortion
VS = 13.7V
60
W
d
PO = 0.1 to 20W
PO = 0.1 to 15W; RL = 4Ω
0.06
0.03
%
%
GV
fH
Voltage Gain
25
26
27
dB
KHz
KΩ
KΩ
µV
dB
High Frequency rolloff
Input Impedance
PO = 1W; -3dB
75
RIN
Differential
60
55
4
Single Ended
EIN
Input Noise Voltage
Rg = 0Ω ; f = 22Hz to 22KHz
f = 1KHz; VIN = 1Vrms
Rg = 0Ω; Vr = 1Vrms
CMRR
SVR
CDL
Tsd
Input Common Mode Rejection
Supply Voltage Rejection
Clipping Detection Level
70
60
0.5
160
dB
%
Absolute Thermal Shutdown
Junction Temperature
dB
3/11
TDA7396
FUNCTIONAL DESCRIPTION
Pin
Function
Description
The input stage is a high impedance differential 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.
1, 2
INPUTS
The TDA7396 is equipped with a diagnostics circuitry able to detect the following events:
- Clipping in the Output Signal
- Thermal Shutdown
- Open Load (before turn-on)
4
CD - DIA
- Shorted Output: to GND, to Vs, across the load (after turn-on)
The CD-DIA(open collector) pin gives out the diagnostics signal (low during clipping or
output fault condition).
The device does not work as long as the faulty condition holds; the normal operation is
automatically restored after the fault removal.
The output stage is a bridge type able to drive loads as high as 2Ω.
It consists of two class AB fully complementary PNP/NPN stages fully protected.
A rail to rail output voltage swing is achieved with no need of bootstrap capacitors.
No external compensation is necessary.
5, 7
OUTPUTS
The device features a ST-BY function which shuts down all the internal bias supplies
when the ST-BY input is low.
In ST-BY mode the amplifier sinks a small current (in the range of few µA).
When the ST-BY pin is high the IC becomes fully operational.
8
STAND-BY
SYNC
A resistor (RS) has to be connect between pin 10 and GND in order to program the
current that flows into CM capacitor (pin 11). The values of CM and RS determine the time
required to bias the amplifier.
10
a) The pin will have a capacitor (CM) tied to GND to set the MUTE/STAND-BY time. An
automatic Mute during turn on/off is provided to prevent noisy transients
b) If a independent Mute function is needed, an external transistor circuit (see fig. 4) may
be connected to this pin; 1% precision resistors have to be used for REXT / RS in to order
to reach the fixed limits 0.63 ≤ REXT / RS ≤ 0.69
11
MUTE
Figure 3: Application Circuit with External Mute Control
+V
S
100nF
OUT+
1000µF
0.22µF
3
9
IN+
2
1
8
7
5
0.22µF
IN-
OUT-
TDA7396
Vref
STANDBY
TO µC or V
10KΩ
S
CD-DIA
4
TO µC
11
10
6
REXT
GND
RS
TO µC
CM
D93AU007
4/11
TDA7396
Figure 4: Quiescent Current vs Supply Voltage
Figure 5: EIAJ power vs Supply Voltage
RL = 2Ω
RL = 4Ω
Figure 7: Distortion vs Frequency (RL =2Ω)
Figure 6: Output Power vs Supply Voltage (RL =2Ω)
VS = 14.4V
RL = 2Ω
PO = 18W
RL = 2Ω
f = 1KHz
f (Hz)
Figure 8: Output Power vs Supply Voltage (RL =4Ω)
Figure 9: Distortion vs Frequency (RL =4Ω)
VS = 14.4V
RL = 4Ω
PO = 15W
RL = 4Ω
f = 1KHz
f (Hz)
5/11
TDA7396
Figure 10: Supply Voltage Rejection vs Fre-
Figure 11: Common Mode Rejection vs. Fre-
quency
quency
VS = 14.4V
Vr = 1Vrms
RL = 2Ω
VS = 14.4V
Vcm = 1Vrms
RL = 2Ω
Rg = 0
Rg = 0
f (Hz)
f (Hz)
Figure 13: Total Power Dissipation & Efficiency vs.
Output Power (RL = 4Ω)
Figure 12: Total Power Dissipation & Efficiency vs.
Output Power (RL = 2Ω)
VS = 14.4V
RL = 2Ω
f = 1KHz
VS = 14.4V
RL = 4Ω
f = 1KHz
6/11
TDA7396
Figure 14: Application Circuit
+V
S
C5 100nF
OUT+
C4 1000µF
C2 0.22µF
3
9
IN+
2
1
7
C1 0.22µF
IN-
OUT-
TDA7396
5
5V
J1
R3
100KΩ
VS
8
CD-DIA
SW1
ST-BY
4
TO µC
11
10
6
R1 15KΩ
GND
R2
C3
10µF
C6
100nF
51KΩ
D93AU108
Figure 15: P.C. Board and Component Layout (1:1 scale)
7/11
TDA7396
CLIPPING DETECTION & DIAGNOSTICS
THERMAL WARNING (see fig. 17)
(see fig. 16)
Thermal protection has been implemented in ac-
cordance to a new principle involving different
steps:
An active pull-down circuit is provided to signal
out the occurrence of any of the conditions de-
scribed later. In order to use this function, the CD-
DIA pin (#4) has to be resistively connected to a
positive voltage reference (between 5V and Vs).
1) Thermal foldback (Linear Thermal Shutdown)
2) Shutdown with soft restart (Absolute Thermal
Shutdown)
A) Clipping Detection
As long as the junction temperature remains be-
low the preset threshold (140°C) the IC delivers
the full power. Once the threshold has been
reached, a thermal foldback starts limiting the out-
put signal level; the output power is then reduced,
thus decreasing also the temperature without out-
put signal interruption (LTS). Supposing the ther-
mal foldback does not reduce the junction tem-
perature to a safe level, a complete shutdown will
occur at 160°C (ATS).
Soft restart avoids large voltage disturbance
across the loudspeaker, due to the presence of
high input signals when the IC comes out of ther-
mal shutdown.
Current is sunk from the CD-DIA pin (#4)when the
thermal protection is acting. The voltage at pin #4
bounces back and forth (depending on the ampli-
fier input signal magnitude) during the linear ther-
mal intervention (LTS) and stays low (sinking cur-
rent) after the amplifier has been eventually
shut-down (Absolute Thermal Shutdown)
Current is sunk whenever the output clipping dis-
tortion level reaches a fixed 0.5% threshold; this
function allows gain compression facility when the
amplifier is overdriven.
B) Output Fault Diagnostics
Current is sunk as soon as one of the following
output faults is recognized:
- short-circuit to GND
- short-circuit to Vs
- short-circuit across the load (after turn-on)
- open load (before turn-on)
The diagnostics signal remains steadily on until
the fault is removed.
All the output fault conditions (listed above) can
be distinguished from the clipping detection (A)
because of their different time duration.
Figure 16: Clipping Detection & Diagnostics Waveforms
Vo
CLIPPING
S/C TO GND
CLIPPING
DETECTOR/
DIAGNOSTICS
OUTPUT
(pin 4)
0
D93AU005A
NORMAL OPERATION
FAULT DIAGNOSTICS
NORMAL OPERATION
8/11
TDA7396
Figure 17: Thermal Protection & Diagnostic Waveforms
MAX OUTPUT
VOLTAGE
SWING
LINEAR
THERMAL
SHUT DOWN
ABS THERMAL
SHUTDOWN
0
140˚C
160˚C
DIAGNOSTICS
OUTPUT
(pin 4)
D93AU006A
9/11
TDA7396
mm
inch
DIM.
OUTLINE AND
MIN. TYP. MAX. MIN. TYP. MAX.
MECHANICAL DATA
A
B
5
0.197
0.104
0.063
2.65
1.6
C
D
1
0.039
E
0.49
0.88
1.45
16.75
19.6
0.55 0.019
0.95 0.035
0.022
0.037
F
G
1.7
17
1.95 0.057 0.067 0.077
17.25 0.659 0.669 0.679
0.772
G1
H1
H2
L
20.2
0.795
21.9
21.7
17.4
22.2
22.1
22.5 0.862 0.874 0.886
22.5 0.854 0.87 0.886
L1
L2
L3
L4
L7
M
18.1 0.685
0.713
17.25 17.5 17.75 0.679 0.689 0.699
10.3
2.65
4.25
4.73
1.9
10.7
10.9 0.406 0.421 0.429
2.9 0.104 0.114
4.55
5.08
4.85 0.167 0.179 0.191
5.43 0.186 0.200 0.214
M1
S
2.6
2.6
0.075
0.075
0.102
0.102
0.152
S1
Dia1
1.9
Multiwatt11 V
3.65
3.85 0.144
10/11
TDA7396
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DocID1512 Rev 4
11/11
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