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PDF TDA7564 Data sheet ( Hoja de datos )
| Número de pieza | TDA7564 | |
| Descripción | MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7564
MULTIFUNCTION QUAD POWER AMPLIFIER
WITH BUILT-IN DIAGNOSTICS FEATURES
s DMOS POWER OUTPUT
s NON-SWITCHING HI-EFFICIENCY
s HIGH OUTPUT POWER CAPABILITY 4x28W/4Ω
@ 14.4V, 1KHZ, 10% THD, 4x40W EIAJ
s MAX. OUTPUT POWER 4x72W/2Ω
s FULL I2C BUS DRIVING:
– ST-BY
– INDEPENDENT FRONT/REAR SOFT PLAY/
MUTE
– SELECTABLE GAIN 26dB - 12dB (FOR
LOW NOISE LINE OUTPUT FUNCTION)
– HIGH EFFICIENCY ENABLE/DISABLE
– I2C BUS DIGITAL DIAGNOSTICS
s FULL FAULT PROTECTION
s DC OFFSET DETECTION
s FOUR INDEPENDENT SHORT CIRCUIT
PROTECTION
s CLIPPING DETECTOR (2% - 10%)
PROTECTION
DESCRIPTION
The TDA7564 is a new BCD technology QUAD
BRIDGE type of car radio amplifier in Flexiwatt25
package specially intended for car radio applica-
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
MOSFET OUTPUT POWER STAGE
FLEXIWATT25
ORDERING NUMBER: TDA7564
tions. Thanks to the DMOS output stage the
TDA7564 has a very low distortion allowing a clear
powerful sound. Among the features, its superior
efficiency performance coming from the internal
exclusive structure, makes it the most suitable de-
vice to simplify the thermal management in high
power sets.The dissipated output power under av-
erage listening condition is in fact reduced up to
50% when compared to the level provided by con-
ventional class AB solutions.This device is
equipped with a full diagnostics array that commu-
nicates the status of each speaker through the I2C
bus.The possibility to control the configuration and
behaviour of the device by means of the I2C bus
makes TDA7564 a very flexible machine.
THERMAL
PROTECTION
& DUMP
CLK DATA
I2CBUS
MUTE1 MUTE2
VCC1 VCC2
REFERENCE
CLIP
DETECTOR
CD_OUT
IN RF
IN RR
IN LF
IN LR
SVR
12/26dB
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
12/26dB
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
12/26dB
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
AC_GND
12/26dB
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
TAB S_GND
RF RR LF LR
PW_GND
OUT RF+
OUT RF-
OUT RR+
OUT RR-
OUT LF+
OUT LF-
OUT LR+
OUT LR-
D00AU1211
September 2003
1/20
1 page  
TDA7564
ELECTRICAL CHARACTERISTICS (continued)
(Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; Tamb = 25°C; unless otherwise specified.)
Symbol
Parameter
Test Condition
Min. Typ. Max.
Pnop
Normal operation thresholds.
Power Amplifier in st-by
(Within these limits, the Output is
considered without faults).
1.8 Vs -1.8
Lsc Shorted Load det.
0.5
Lop Open Load det.
85
Lnop Normal Load det.
1.75 45
TURN ON DIAGNOSTICS 2 (Line Driver Mode)
Pgnd
Short to GND det. (below this
limit, the Output is considered in
Short Circuit to GND)
Power Amplifier in st-by
1.2
Pvs Short to Vs det. (above this limit,
the Output is considered in Short
Circuit to VS)
Vs -1.2
Pnop
Normal operation thresholds.
(Within these limits, the Output is
considered without faults).
1.8 Vs -1.8
Lsc Shorted Load det.
2
Lop Open Load det.
330
Lnop Normal Load det.
7 180
PERMANENT DIAGNOSTICS 2 (Power Amplifier Mode or Line Driver Mode)
Pgnd
Short to GND det. (below this
limit, the Output is considered in
Short Circuit to GND)
Power Amplifier in Mute or Play,
one or more short circuits
protection activated
1.2
Pvs Short to Vs det. (above this limit,
the Output is considered in Short
Circuit to VS)
Vs -1.2
Pnop
Normal operation thresholds.
(Within these limits, the Output is
considered without faults).
1.8 Vs -1.8
LSC Shorted Load Det.
Pow. Amp. mode
0.5
Line Driver mode
2
VO Offset Detection
Power Amplifier in play,
AC Input signals = 0
±1.5 ±2 ±2.5
INL Normal load current detection
VO < (VS - 5)pk
500
IOL Open load current detection
VO < (VS - 5)pk
250
I2C BUS INTERFACE
fSCL Clock Frequency
400
VIL Input Low Voltage
1.5
VIH Input High Voltage
2.3
Unit
V
Ω
Ω
Ω
V
V
V
Ω
Ω
Ω
V
V
V
Ω
Ω
V
mA
mA
KHz
V
V
5/20
5 Page 
TDA7564
– After a diagnostic cycle, the audio channel interested by the fault is switched to RESTART mode. The
relevant data are stored inside the device and can be read by the microprocessor. When one cycle has
terminated, the next one is activated by an I2C reading. This is to ensure continuous diagnostics
throughout the car-radio operating time.
– To check the status of the device a sampling system is needed. The timing is chosen at microprocessor
level (over half a second is recommended).
Figure 19. Restart timing without Diagnostic Enable (Permanent) - Each 1mS time, a sampling of
the fault is done
1-2mS
1mS
1mS 1mS
1mS
Out
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
t
Short circuit removed
Figure 20. Restart timing with Diagnostic Enable (Permanent)
1-2mS
100/200mS
1mS
1mS
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
t
Short circuit removed
OUTPUT DC OFFSET DETECTION
Any DC output offset exceeding ±2V are signalled out. This inconvenient might occur as a consequence of ini-
tially defective or aged and worn-out input capacitors feeding a DC component to the inputs, so putting the
speakers at risk of overheating.
This diagnostic has to be performed with low-level output AC signal (or Vin = 0).
The test is run with selectable time duration by microprocessor (from a "start" to a "stop" command):
– START = Last reading operation or setting IB1 - D5 - (OFFSET enable) to 1
– STOP = Actual reading operation
Excess offset is signalled out if persistent throughout the assigned testing time. This feature is disabled if any
overloads leading to activation of the short-circuit protection occurs in the process.
AC DIAGNOSTIC.
It is targeted at detecting accidental disconnection of tweeters in 2-way speaker and, more in general, presence
of capacitively (AC) coupled loads.
This diagnostic is based on the notion that the overall speaker's impedance (woofer + parallel tweeter) will tend
to increase towards high frequencies if the tweeter gets disconnected, because the remaining speaker (woofer)
would be out of its operating range (high impedance). The diagnostic decision is made according to peak output
11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TDA7564.PDF ] | |
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