ST TDA7383 User Manual

查询TDA7383供应商
4 x 30W QUAD BRIDGE CAR RADIO AMPLIFIER
HIGHOUTPUTPOWERCAPABILITY: 4 x35W/4MAX. 4 x30W/4ΩEIAJ 4 x22W/4Ω@ 14.4V, 1KHz, 10% 4 x18.5W/4@ 13.2V,1KHz,10%
CLIPPINGDETECTOR LOW DISTORTION LOW OUTPUTNOISE ST-BYFUNCTION MUTEFUNCTION AUTOMUTEAT MIN. SUPPLY VOLTAGE DE-
TECTION DIAGNOSTICSFACILITYFOR:
– CLIPPING – OUTTOGND SHORT – OUTTOV – THERMALSHUTDOWN
LOW EXTERNALCOMPONENTCOUNT: – INTERNALLYFIXED GAIN (32dB) – NOEXTERNALCOMPENSATION – NOBOOTSTRAPCAPACITORS
PROTECTIONS:
OUTPUT SHORT CIRCUIT TO GND, TO V ACROSS THE LOAD
SHORT
S
TDA7383
FLEXIWATT25
ORDERING NUMBER: TDA7383
VERYINDUCTIVE LOADS OVERRATING CHIP TEMPERATURE WITH
SOFTTHERMAL LIMITER LOADDUMP VOLTAGE FORTUITOUSOPEN GND REVERSEDBATTERY ESD PROTECTION
DESCRIPTION
The TDA7383 is a new technology class AB Audio Power Amplifier in Flexiwatt 25 package designed for high end car radioapplications.
,
S
BLOCK AND APPLICATION DIAGRAM
Vcc1 Vcc2
ST-BY
MUTE
IN1
0.1µF
IN2
0.1µF
IN3
0.1µF
IN4
0.1µF
AC-GND
0.1µF47µF
October 1999
100nF2.200µF
DIAGN. OUT
OUT1+ OUT1­PW-GND
OUT2+ OUT2­PW-GND
OUT3+ OUT3­PW-GND
OUT4+ OUT4­PW-GND
SVR TAB S-GND
D93AU002C
1/12
TDA7383
DESCRIPTION(continued)
Thanks to the fully complementaryPNP/NPN out­put configurationthe TDA7383 allows a rail to rail output voltage swing with no need of bootstrap capacitors. The extremely reduced components count allows very compact sets.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
CC (DC)
V
CC (pk)
CC
I
O
Operating Supply Voltage 18 V DC Supply Voltage 28 V Peak Supply Voltage (t = 50ms) 50 V Output Peak Current:
Repetitive (Duty Cycle 10% at f = 10Hz) Non Repetitive(t = 100µs)
P
tot
T
j
T
stg
Power dissipation, (T
=70°C) 80 W
case
Junction Temperature 150 Storage Temperature – 55 to150
PIN CONNECTION (Topview)
The on-board clipping detector simplifies gain compression operations. The fault diagnostics makes it possible to detect mistakes during Car­Radioassembly and wiring in the car.
4.5
5.5
A A
C
°
C
°
1 25
TAB
OUT2-
P-GND
ST-BY
CC
V
OUT2+
OUT1-
OUT1+
P-GND1
SVR
IN1
IN2
IN4
S-GND
IN3
OUT3+
AC-GND
OUT3-
P-GND3
CC
V
MUTE
OUT4+
D94AU117B
OUT4-
P-GND4
DIAGNOSTICS
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction to Case Max. 1
2/12
R
th j-case
C/W
°
TDA7383
ELECTRICALCHARACTERISTICS(VS= 14.4V; f = 1KHz; RL=4;T
amb
=25°C;
Refer to the Testand application circuit (fig.1),unless otherwisespecified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
I
q1
V
OS
G
v
P
o
P
o EIAJ
P
o max.
THD Distortion P
e
No
SVR Supply Voltage Rejection f = 100Hz 50 65 dB
f
cl
f
ch
R
C
T
I
SB
V
SB out
V
SB IN
A
M
V
M out
V
Min
I
m (L)
I
CDOFF
I
CDON
(*) Saturated square wave output. (**) Diagnostics output pulled-up to 5V with 10Kseries resistor.
Quiescent Current 180 300 mA Output Offset Voltage 200 mV Voltage Gain 31 32 33 dB Output Power THD = 10%
THD = 1% THD = 10%; V
THD = 5%; V THD = 1%; V
THD = 10%; V THD = 1%; V
= 14V
S
= 14V
S
= 14V
S
= 13.2V
S
= 13.2V
S
20
16.5 19
17 16
17 14
22 18
21 19 17
18.5 15
EIAJ Ouput Power (*) VS = 13.7V 27.5 30 W Max. Output Power (*) VS= 14.4V 33 35 W
= 4W 0.05 0.3 %
o
Output Noise ”A” Weighted
Bw = 20Hz to 20KHz
75
100 150
Low Cut-Off Frequency 20 Hz High Cut-Off Frequency 75 KHz Input Impedance 70 100 K
i
Cross Talk f= 1KHz 50 70 dB St-By Current Consumption St-By = LOW 100 St-By OUT ThresholdVoltage (Amp: ON) 3.5 V St-By IN Threshold Voltage (Amp: OFF) 1.5 V Mute Attenuation VO= 1Vrms 80 90 dB Mute OUT Threshold Voltage (Amp: Play) 3.5 V Mute IN Threshold Voltage (Amp: Mute) 1.5 V Muting Pin Current V
MUTE
= 1.5V
51016µA
(Source Current)
Clipping Detector ”OFF” Output
THD = 1% (**) 100
Average Current Clipping Detector ”ON” Output
THD = 10% (**) 100 240 350 µA
Average Current
W W
W W W
W W
µ µV
µ
µ
V
A
A
3/12
TDA7383
Figure 1: StandardTest and Application Circuit
ST-BY
MUTE
IN1
IN2
IN3
IN4
R1
10K
R2
47K
C1
0.1µF
C2 0.1µF
C3 0.1µF
C4 0.1µF
C9
1µF
C10 1µF
S-GND
C8
0.1µF
4
22
11
12
15
14
13
16 10 25 1
C5
0.1µF
C7
2200µF
Vcc1-2 Vcc3-4
SVR TAB
C6
47µF
620
9 8 7
5 2 3
17 18 19
21 24 23
OUT1
OUT2
OUT3
OUT4
D94AU179B
4/12
DIAGNOSTICS
Figure 2: P.C.B. and componentlayout of the figure 1 (1:1scale)
TDA7383
COMPONENTS & TOP COPPER LAYER
TDA7383
BOTTOM COPPER LAYER
5/12
TDA7383
Figure 3: QuiescentCurrent vs. Supply Voltage
Figure 5: Output Power vs. SupplyVoltage
Figure4: Quiescent Output Voltage vs. Supply
Voltage
Figure6: Distortionvs. Output Power
THD(%)
10
Vs= 14.4V RL = 4 Ohm
Figure 7: Distortion vs. Frequency.
THD (%)
10
Vs= 14.4 V
RL = 4 Ohm
Po= 1 W
1
0.1
1
f= 10 KHz
0.1
0
0.1 1 10
f= 1 KHz
Po(W)
Figure 8: Supply Voltage Rejection vs.
Frequency
SVR (dB)
100
Rg= 600 Ohm
90
Vripple= 1 Vrms
80 70 60 50 40
0
10 100 1000 10000
f (Hz)
6/12
30
10 100 1000 10000
f (Hz)
TDA7383
Figure 9: Output Noise vs. Source Resistance
En (µV)
200 180
Vs= 14.4 V RL= 4 Ohm
160 140 120
22 - 22K Hz lin.
100
80
”A” wgtd
60 40
1 10 100 1k 10k 100k
Rg (Ohm)
APPLICATIONHINTS (ref.to the circuit of fig. 1) BIASING AND SVR As shown by fig. 11, all the TDA7383’s main sec-
tions, such as INPUTS, OUTPUTS AND AC-GND (pin 16) are internally biased at half Supply Volt­age level (Vs/2), whichis derived from the Supply VoltageRejection (SVR) block. In this way no cur­rent flows throughthe internalfeedbacknetwork.
The AC-GND is common to all the 4 amplifiers and represents the connection point of all the in­verting inputs.
Both individual inputs and AC-GND are con­nected to Vs/2 (SVR) by means of 100KΩresis­tors.
Figure10: Power Dissipation & Efficiency vs.
OutputPower
Ptot (W)
To ensure proper operation and high supply volt­age rejection, it is of fundamental importance to provide a good impedance matching between IN­PUTS and AC-GROUND terminations. This im­pliesthat C
1,C2,C3,C4,C5
CAPACITORSHAVE TO CARRY THE SAME NOMINAL VALUE AND THEIR TOLERANCE SHOULDNEVER EXCEED ±10 %.
Besides its contributionto the ripple rejection, the SVR capacitor governs the turn ON/OFFtime se­quence and, consequently,plays an essential role in the pop optimizationduring ON/OFF transients. To conveniently serve both needs, ITS MINIMUM
RECOMMENDEDVALUE IS 10µF.
Figure 11: Input/OutputBiasing.
V
S
10K
SVR AC_GND
10K
100K
F
0.1µ
C1 ÷ C4
100K70K
47µ
F
C6
IN
0.1µ C5
F
+
-
8K
400
400
8K
-
+
TOWARDS
OTHER CHANNELS
D95AU302
7/12
TDA7383
INPUT STAGE The TDA7383’s inputs are ground-compatibleand
can stand very high inputsignals (± 8Vpk)without any performancesdegradation.
If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off will amount to 16 Hz.
STAND-BYAND MUTING STAND-BY and MUTING facilities are both
CMOS-COMPATIBLE. If unused, a straight con­nection to Vs of theirrespective pins wouldbe ad­missible. Conventional low-power transistorscan be employed to drive muting and stand-by pins in absence of true CMOSports or microprocessors.
R-C cells have always to be used in order to smooth down the transitions for preventing any audible transientnoises.
Since a DC current of about 10 uA normallyflows out of pin 22, the maximum allowable muting-se­ries resistance (R
) is 70KΩ, which is sufficiently
2
high to permit a muting capacitor reasonably small (about 1µF).
If R
is higher than recommended, the involved
2
risk will be that the voltage at pin 22 may rise to above the 1.5 V threshold voltage and the device will consequently fail to turn OFF when the mute line is brought down.
About the stand-by, the time constant to be as­signed in order to obtain a virtually pop-free tran­sition has to be slowerthan 2.5V/ms.
tion with microprocessor-drivenaudioprocessors. The maximum load that pin 25 can sustain is
1K. Due to its operating principles, the clipping detec-
tor has to be viewed mainly as a power-depend­Figure12: Diagnosticscircuit.
25
Vpin 25
R
VREF
D95AU303A
Figure13: Clipping Detection Waveforms.
DIAGNOSTICSFACILITY The TDA7383 is equipped with a diagnostics cir-
cuitry able to detectthe following events:
CLIPPINGin the output stage OVERHEATING (THERMAL SHUT-DOWN
proximity) OUTPUT MISCONNECTIONS (OUT-GND &
OUT-Vsshorts)
Diagnostics information is available across an open collector output located at pin 25 (fig. 12) through a current sinking whenever at least one of the above events is recognized.
Among them, the CLIPPING DETECTOR acts in a way to output a signal as soon as one or more power transistorsstart being saturated.
As a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly syn­cronized with each single clipping event in the music program and reflect the same duration time (fig. 13). Applications making use of this facility usually operatea filtering/integrationof the pulses train through passive R-C networks and realize a volume (or tone bass) stepping down in associa-
8/12
ent feature rather than frequency-dependent.This means that clipping state will be immediately sig­naled out whenever a fixed power level is reached,regardlessof the audiofrequency.
In other words, this feature offers the means to counteract the extremely sound-damaging effects of clipping, caused by a sudden increase of odd order harmonics and appearance of serious inter­modulationphenomena.
Another possible kind of distortion control could be the setting of a maximum allowable THD limit (e.g. 0.5 %) over the entire audio frequency range. Besides offering no practical advantages, this procedure cannot be much accurate, as the non-clipping distortion is likely to vary over fre­quency.
In case of OVERHEATING, pin 25 will signal out the junction temperature proximity to the thermal shut-down threshold. This will typically start about
o
C beforethe thermal shut-downthreshold is
2
Figure 14: DiagnosticsWaveforms.
ST-BY PIN VOLTAGE
MUTE PIN VOLTAGE
Vs
OUTPUT
WAVEFORM
Vpin 25
WAVEFORM
TDA7383
t
t
t
D95AU304
reached. As variouskind of diagnostics informationis avail-
able at pin 25 (CLIPPING, SHORTS AND OVER­HEATING), it may be necessary to operate some distinctions on order to treat each event sepa­rately. This could be achieved by taking into ac­count the intrinsically different timing of the diag­nostics outputunder each circumstance.
Figure 15.
VREF
25
T1 <<
T2
VREF VREF1 >> VREF2
T1
T2
VREF1
VREF2
CLIPPING
SHORT TO GND
OR TO Vs
THERMAL
PROXIMITY
t
In fact, clipping will produce pulses normally much shorter than thosepresent under faultycon­ditions. An example of circuit able to distinguish between the two occurrences is shown by fig. 15.
STABILITYAND LAYOUT CONSIDERATIONS If properly layouted and hooked to standard car-
radio speakers, the TDA7383 will be intrinsically stable with no need of external compensations
-
+
-
+
CLIP DET. (TO
COMPRESSOR/
TONE CONTROL)
FAULT, THERMAL
(TO POWER SUPPLY
SECTION, µP
REGULATOR, FLASHING SYSTEM)
D95AU305A
GAIN
SHUTDOWN
VOLTAGE
9/12
TDA7383
such as output R-C cells. Dueto the high number of channels involved, this translates into a very remarkable components saving if compared to similar devices on the market.
To simplify pc-board layout designs, each ampli­fier stage has its own power ground externallyac­cessible (pins 2,8,18,24) and one supply voltage pin foreach couple of them.
Even more important, this makes it possible to achieve the highest possible degreeof separation among the channels,with remarkable benefits in termsof cross-talkand distortionfeatures.
About the layout grounding, it is particularly im-
portant to connect the AC-GND capacitor (C
)to
5
the signal GND, as close as possible to the audio inputs ground: this will guarantee high rejection of any common mode spurious signals.
The SVR capacitor (C
) has also to be connected
6
to the signalGND. Supply filtering elements (C
) have naturally
7,C8
to be connected to the power-groundand located as close as possibleto theVs pins.
Pin 1, which is mechanically attached to the de­vice’s tab, needs to be tied to the cleanest power ground point in the pc-board, which is generally near the supplyfilteringcapacitors.
10/12
TDA7383
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
mm inch
A 4.45 4.50 4.65 0.175 0.177 0.183 B 1.80 1.90 2.00 0.070 0.074 0.079 C 1.40 0.055 D 0.75 0.90 1.05 0.029 0.035 0.041 E 0.37 0.39 0.42 0.014 0.015 0.016
F (1) 0.57 0.022
G 0.80 1.00 1.20 0.031 0.040 0.047
G1 23.75 24.00 24.25 0.935 0.945 0.955
H (2) 28.90 29.23 29.30 1.138 1.150 1.153
H1 17.00 0.669 H2 12.80 0.503 H3 0.80 0.031
L (2) 22.07 22.47 22.87 0.869 0.884 0.904
L1 18.57 18.97 19.37 0.731 0.747 0.762
L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626
L3 7.70 7.85 7.95 0.303 0.309 0.313 L4 5 0.197 L5 3.5 0.138
M 3.70 4.00 4.30 0.145 0.157 0.169
M1 3.60 4.00 4.40 0.142 0.157 0.173
N 2.20 0.086 O 2 0.079
R 1.70 0.067 R1 0.5 0.02 R2 0.3 0.12 R3 1.25 0.049 R4 0.50 0.019
V5°(Typ.)
V1 3°(Typ.) V2 20°(Typ.) V3 45°(Typ.)
(1): dam-bar protusion not included (2): molding protusionincluded
OUTLINE AND
MECHANICALDATA
Flexiwatt25
L2
H
V3
OL3 L4
V
C
H3
G
H1
G1
R3
H2
F
A
R4
N
V2
R2
R
L
L1
V1
R2
B
V
FLEX25ME
R1
L5
V1
R1 R1
E
M1
M
D
11/12
TDA7383
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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