ST TDA2052 User Manual

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60W Hi-Fi AUDIO POWER AMPLIFIER
SUPPLYVOLTAGERANGEUP TO±25V SPLIT SUPPLY OPERATION HIGHOUTPUT POWER
(UP TO 60W MUSICPOWER) LOW DISTORTION MUTE/STAND-BY FUNCTION NO SWITCH ON/OFF NOISE AC SHORT CIRCUIT PROTECTION THERMALSHUTDOWN ESDPROTECTION
TDA2052
WITH MUTE / STAND-BY
Heptawatt
ORDERING NUMBER: TDA2052
DESCRIPTION
The TDA2052 is a monolithic integrated circuit in Heptawatt package, intended for use as audio class AB amplifier in TV or Hi-Fi field application. Thanks to the wide voltage range and to the high out current capability it’s able to supply the high-
TEST ANDAPPLICATION CIRCUIT
est power into both 4Ωand 8Ωloads even in presenceof poorsupply regulation.
The built in Muting/Stand-by function simplifies the remote operations avoiding also switchingon­off noises.
February 1997
This is advanced information on a new product now in developmentor undergoing evaluation. Detailsare subject to changewithoutnotice.
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TDA2052
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
I
O
P
tot
T
op
T
stg,Tj
PIN CONNECTION (Topview)
DC Supply Voltage ±25 V
S
Output PeakCurrent (internally limited) 6 A Power DissipationT
=70°C30W
case
Operating Temperature Range 0 to +70 °C Storage and Junction Temperature -40 to +150
7 NON INVERTING INPUT(PLAY) 6 5 4 3 2 1
INVERTING INPUT NON INVERTING INPUT(MUTE)
-V
S
STAND-BY/MUTE +V
S
OUTPUT
C
°
tab connected to pin 4
BLOCK DIAGRAM
D95AU326
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TDA2052
THERMAL DATA
Symbol Description Value Unit
R
th j-case
Thermal ResistanceJunction-case Max 2.5
C/W
°
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, GV= 32dB; VS+ 18V; f = 1KHz; T 25°C, unlessotherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
q
I
b
V
OS
I
OS
P
O
P
O
Supply Range +6 +25 V Total Quiescent Current VS= +22V 20 40 70 mA Input Bias Current +0.5 µA Input Offset Voltage +15 mV Input Offset Current +200 nA Music Output Power
IEC268-3 Rules (*)
VS= + 22.5, RL=4Ω,
d = 10%, t = 1s 50 60 W
Output Power(continuous RMS) d = 10%
RL = 4 R
=8
L
V
= +22V, RL=8
S
35 30
40 22 33
d=1%
d Total Harmonic Distortion R
R
=4
L
R
=8
L
V
= +22V, RL=8
S
=4
L
P
= 0.1 to 20W;
O
f = 100Hz to 15KHz
+ 22V, RL=8
V
S
P
= 0.1 to 20W;
O
f = 100Hz to 15KHz
32 17 28
0.1
0.1
0.7
0.5 SR Slew Rate 3 5 V/µs G
V
e
N
R
SVR Supply Voltage Rejection f = 100Hz, V
T
S
Open Loop Voltage Gain 80 dB Total Input Noise A Curve
f = 20Hz to 20KHz
Input Resistance 500 K
i
ripple =1VRMS 40 50 dB
2 310
Thermal Shutdown 145 °C
MUTE/STAND-BY FUNCTION (Ref.–VS)
=
amb
W W W
W W W
%
%
V
µ µV
VT
ST-BY
VT
PLAY
I
q ST-BY
ATT
ST-BY
I
pin3
Note (*):
MUSIC POWER CONCEPT MUSIC POWER is ( according tothe IEC clauses n.268-3 of Jan 83) the maximal power which theamplifier iscapable of producing across the rated load resistance (regardlessof nonlinearity) 1 sec after the application of a sinusoidal input signalof frequency 1KHz.
According to this definition our method of measurementcomprises the followingsteps:
1) Set the voltage supply at the maximumoperating value -10%
2) Apply a input signalin the form of a 1KHztone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec
3) The output voltage is measured 1 sec from thestart of the pulse
4) Increase the input voltage until the outputsignal show a THD = 10%
5) The music power is thenV The target of this method isto avoid excessive dissipationin theamplifier.
Stand-by - Threshold 1 1.8 V Play Threshold 2.7 4 V Quiescent Current @ Stand-by V
= 0.5V 1 3 mA
pin 3
Stand-by Attenuation 70 90 dB Pin 3 Current @ Stand-by –1 +10 µA
2
/R1,where V
out
isthe output voltage measured in thecondition of point 4) and R1 is the rated load impedance
out
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TDA2052
APPLICATIONS SUGGESTIONS (See Test and ApplicationCircuit)
The recommendedvalues of the external components are those shown on the application circuit. Differ­ent valuescan be used;the followingtable can help the designer.
Comp. Value Purpose Larger Than Smaller Than
R1 22K
R2 560 Closed LoopGain set to R3 22K R4 22K R5 22K R6 4.7 C1 1µF Input DC Decoupling Higher Low-frequency
C2 10µF Feedback DC Decoupling Higher Low-frequency
C3 10µF Stand-by TimeConstant C4 0.100µF Frequency Stability Danger of Oscillations
C5, C6 1000µF Supply Voltage Bypass
(*) R1 =R3 = R4for POP optimization (**) Closed Loop Gain hasto be 30dB
(*) Input Impedance Increase ofInput
(*) Increase ofGain Decrease of Gain
(*) Input Impedance @ Mute
32dB (**)
Stand-by TimeConstant Frequency Stability Danger of oscillations Danger of oscillations
Impedance Decrease of Gain Increase ofGain
Decrease of Input Impedance
cut-off
cut-off
TYPICALCHARACTERISTICS
Figure 1: OutputPower vs. Supply Voltage
4/13
Figure2: Distortionvs. OutputPower
Figure 3: OutputPower vs. Supply Voltage. Figure4: Distortionvs. OutputPower.
TDA2052
Figure 5: Distortionvs. Frequency.
Figure 7: QuiescentCurrent vs. Supply Voltage
Figure6: Distortionvs. Frequency.
Figure8: SupplyVoltageRejectionvs.Frequency.
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TDA2052
Figure 9: Bandwidth.
Figure 11: TotalPower Dissipation & Efficiency
vs. OutputPower.
Figure10: OutputAttenuation& QuiescentCur-
rent vs. V
pin3
.
Figure12: TotalPowerDissipation& Efficiency
vs. Output Power.
6/13
Figure 13: P.C.Board andComponents Layoutof the Circuit of Fig. 14(1:1 scale)
TDA2052
Figure 14: Demo Board Schematic.
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TDA2052
MUTE/STAND-BY FUNCTION
The pin 3 (MUTE/STAND-BY) controls the ampli­fier status by three different thresholds, referred to-V
S.
When its voltage is lower than the first threshold (1V, with a +70mV hysteresis), the amplifier is in STAND-BY and all the final stage current gener-
Figure 15.
ators are off. Only the input MUTE stage is on in orderto preventpop-on problems.
At V
=1.8V the final stage current generators
pin3
are switched on and the amplifier operates in MUTE.
For V
=2.7V the amplifier is definitely on
pin3
(PLAYcondition)
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TDA2052
SHORT-CIRCUIT PROTECTION
The TDA 2052 has an original circuit which pro­tects the deviceduring accidental short-circuitbe­tween output and GND / -Vs / +Vs, taking it in STAND-BY mode, so limiting also dangerousDC current flowing throught the loudspeaker.
If a short-circuitor an overload dangerousfor the final transistors are detected,the concernedSOA circuit sends out a signal to the latching circuit (with a 10µs delay time that prevents fast random spikes from inadvertently shutting the amplifier off) which makes Q Diagram). Q
immediatelyshort-circuits to ground
1
and Q2saturate (see Block
1
the A point turning the final stage off while Q short-circuits to ground the external capacitor driving the pin 3 (Mute/Stand-by) towards zero potential.
Only when the pin 3 voltage becomes lower than 1V, the latching circuit is allowed to reset itself and restart the amplifier, provided that the short­circuit condition has been removed. In fact, a win­dow comparator is present at the output and it is aimed at preventingthe amplifierfrom restartingif the output voltageis lower than0.35 Total Supply Voltage or higher than 0.65 Total Supply Voltage. If the output voltage lies between these two thresholds, one may reasonably suppose the short-circuit has been removed and the amplifier may start operatingagain.
The PLAY/MUTE/STAND-BY function pin (pin 3) is both ground- and positive supply-compatible and can be interfacedby means of the R
5,C3
net either to a TTL or CMOS output (µ-Processor) or to a specificapplication circuit.
The R
net is fundamental,because connect-
5,C3
ing this pin directly to a low output impedance driver such as TTL gate would preventthe correct operation during a short-circuit. Actually a final stage overload turns on the protection latching circuit that makesQ
try to drive the pin 3 voltage
2
under 0.8 V. Since the maximum current this pin can stand is 3 mA, one must make sure the fol­lowing condition is met:
THERMAL PROTECTION
The thermal protection operates on the 125µA current generator, linearly decreasing its value from 90°C on. By doing this, the A voltage slowly decreases thus switching the amplifier first to MUTE (at 145°C) and then to STAND-BY (155°C).
Figure16: ThermalProtectionBlock Diagram
2
The maximum allowable power dissipation de­pends on the size of the external heatsink (ther­mal resistance case-ambient); figure 17 shows the dissipable power as a function of ambient temperaturefor different thermal resistance.
Figure17: MaximumAllowable PowerDissipa-
tion vs. AmbientTemperature.
(VA− 0.7V)
R
that yields: R
5
5, min
3mA
= 1.5KΩwithVA=5V.
In order to prevent pop-on and -off transients,it is advisable to calculate the C
,R5net in such a
3
way that the STAND-BY/MUTEand MUTE/PLAY threshold crossing slope (positive at the turn-on and vice-versa)is less than 100 V/sec.
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TDA2052
APPLICATION NOTES 90W MULTIWAY SPEAKER SYSTEM
The schematic diagram of figure 18, shows the solution that we have closen as a suggestion for Hi-Fiand especiallyTV applications.
The multiway system provides the separation of the musical signal not only for the loudspeakers, but also for the power amplifierswith the following advantages:
Figure 18: MultiwayApplicationCircuit
- reduced power level required of each individ­ual amplifier
- complete separation of the ways (if an ampli­fier is affected by clipping distortion, the oth­ers are not)
- protection of tweeters (the high power har­monics generated by low frequency clipping can not damagethe delicate tweeters that are drivenby independentpower amplifier)
- highpower dedicatedto low frequencies
10/13
TDA2052
As shown in Figure 19, the R-C passive network for low-pass and High-pass give a cut with a slope of 12dB/octave A further advantage of thisapplication is that con­necting each speaker direcly to its amplifier, the musical signal is not modified by the variations of the impedance of thecrossover over frequency.
The subwoofer is designed for obtaining high sound pressure level with low distortion without stereo effect.
In the application of figure 18, the subwoofer plays the 20 to 300 Hzfrequency range,while the remaining 300 Hz to 20KHz are sentto two sepa­rate channels withstereo effect.
The multiway system makes use of three TDA2052, one for driving the subwoofer with
OUT higherthan 40W (THD = 10%), 28W undis-
P torted (THD = 0.01%), while the others two TDA2052 are used for driving the mid/high fre­quency speakers of L/R channels, delivering
OUT = 25W (THD = 10%) and 20W @ THD =
P
0.01%
Figure 20: Distortionvs OutputPower
(Subwoofer)
Figure19: FrequencyResponse
Figure21:Distortionvs Output Power
(Midrange/Tweeter)
11/13
TDA2052
HEPTAWATT PACKAGEMECHANICAL DATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189 C 1.37 0.054 D 2.4 2.8 0.094 0.110
D1 1.2 1.35 0.047 0.053
E 0.35 0.55 0.014 0.022 F 0.6 0.8 0.024 0.031
F1 0.9 0.035
G 2.41 2.54 2.67 0.095 0.100 0.105 G1 4.91 5.08 5.21 0.193 0.200 0.205 G2 7.49 7.62 7.8 0.295 0.300 0.307 H2 10.4 0.409 H3 10.05 10.4 0.396 0.409
L 16.97 0.668 L1 14.92 0.587 L2 21.54 0.848 L3 22.62 0.891 L5 2.6 3 0.102 0.118 L6 15.1 15.8 0.594 0.622 L7 6 6.6 0.236 0.260
M 2.8 0.110
M1 5.08 0.200
Dia 3.65 3.85 0.144 0.152
mm inch
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TDA2052
Information furnished is believed to be accurate and reliable.However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third partieswhich may result from its use. No license is granted by implicationor otherwise under any patentor patentrights of SGS-THOMSON Microelectronics. Specificationmentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS­THOMSON Microelectronics products are not authorizedfor use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics – Printedin Italy – All Rights Reserved
HEPTAWATTis a Trademark of the SGS-THOMSON Microelectronics
SGS-THOMSON Microelectronics GROUPOF COMPANIES
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