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INTEGRATED CIRCUITS
DATA SHEET
TDA8571J
4 x 40 W BTL quad car radio power amplifier
Preliminary specification |
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1998 Mar 13 |
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File under Integrated Circuits, IC01 |
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Philips Semiconductors |
Preliminary specification |
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4 x 40 W BTL quad car radio power
TDA8571J
amplifier
FEATURES
·Requires very few external components
·High output power
·Low output offset voltage
·Fixed gain
·Diagnostic facility (distortion, short-circuit and temperature pre-warning)
·Good ripple rejection
·Mode select switch (operating, mute and standby)
·Load dump protection
·Short-circuit safe to ground and to VP and across the load
·Low power dissipation in any short-circuit condition
·Thermally protected
·Reverse polarity safe
·Electrostatic discharge protection
·No switch-on/switch-off plop
·Flexible leads
·Low thermal resistance
·Pin compatible with the TDA8568Q, except for the gain.
QUICK REFERENCE DATA
GENERAL DESCRIPTION
The TDA8571J is a integrated class-B output amplifier contained in a 23-lead Single-In-Line (SIL) plastic power package. It contains four amplifiers in a BTL configuration, each with a gain of 34 dB. The output power is 4 ´ 40 W (EIAJ) into a 4 W load.
APPLICATIONS
·The device is primarily developed for car radio applications.
SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
TYP. |
MAX. |
UNIT |
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VP |
operating supply voltage |
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6 |
14.4 |
18 |
V |
IORM |
repetitive peak output current |
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- |
- |
7.5 |
A |
Iq(tot) |
total quiescent current |
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- |
200 |
- |
mA |
Istb |
standby current |
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- |
0.2 |
100 |
mA |
Isw |
switch-on current |
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- |
- |
80 |
mA |
ïZiï |
input impedance |
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25 |
30 |
- |
kW |
Po(max) |
maximum output power |
THD = maximum |
- |
40 |
- |
W |
SVRR |
supply voltage ripple rejection |
Rs = 0 W |
- |
50 |
- |
dB |
acs |
channel separation |
Rs = 10 kW |
- |
50 |
- |
dB |
Gv(cl) |
closed-loop voltage gain |
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33 |
34 |
35 |
dB |
Vn(o) |
noise output voltage |
Rs = 0 W |
- |
- |
170 |
mV |
ïVOSï |
DC output offset voltage |
MUTE |
- |
- |
80 |
mV |
ïDVOSï |
delta DC output offset voltage |
ON « MUTE |
- |
- |
80 |
mV |
ORDERING INFORMATION
TYPE |
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PACKAGE |
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NUMBER |
NAME |
DESCRIPTION |
VERSION |
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TDA8571J |
DBS23P |
plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm) |
SOT411-1 |
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1998 Mar 13 |
2 |
Philips Semiconductors |
Preliminary specification |
|
|
4 x 40 W BTL quad car radio power
TDA8571J
amplifier
BLOCK DIAGRAM
MODE |
VP1 |
VP2 |
VP3 |
VP4 |
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15 |
1 |
8 |
16 |
23 |
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10 |
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+ |
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IN1 |
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2 |
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− |
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OUT1+ |
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30 kΩ |
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+ |
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4 |
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− |
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OUT1− |
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11 |
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Vref |
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+ |
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IN2 |
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7 |
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− |
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OUT2+ |
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30 kΩ |
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+ |
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5 |
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− |
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OUT2− |
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12 |
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SGND |
TDA8571J |
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9 |
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DIAGNOSTIC |
VDIAG |
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13 |
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+ |
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IN3 |
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17 |
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− |
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OUT3+ |
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30 kΩ |
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+ |
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19 |
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− |
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OUT3− |
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14 |
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Vref |
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+ |
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IN4 |
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22 |
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− |
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OUT4+ |
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30 kΩ |
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+ |
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20 |
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− |
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OUT4− |
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3 |
6 |
18 |
21 |
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PGND1 |
PGND2 |
PGND3 |
PGND4 |
MGM562 |
Fig.1 Block diagram.
1998 Mar 13 |
3 |
Philips Semiconductors |
Preliminary specification |
|
|
4 x 40 W BTL quad car radio power
TDA8571J
amplifier
PINNING
SYMBOL |
PIN |
DESCRIPTION |
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VP1 |
1 |
supply voltage 1 |
OUT1+ |
2 |
output 1+ |
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PGND1 |
3 |
power ground 1 |
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OUT1− |
4 |
output 1− |
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OUT2− |
5 |
output 2− |
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PGND2 |
6 |
power ground 2 |
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OUT2+ |
7 |
output 2+ |
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VP2 |
8 |
supply voltage 2 |
VDIAG |
9 |
diagnostic output |
IN1 |
10 |
input 1 |
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IN2 |
11 |
input 2 |
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SGND |
12 |
signal ground |
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IN3 |
13 |
input 3 |
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IN4 |
14 |
input 4 |
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MODE |
15 |
mode select switch input |
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VP3 |
16 |
supply voltage 3 |
OUT3+ |
17 |
output 3+ |
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PGND3 |
18 |
power ground 3 |
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OUT3− |
19 |
output 3− |
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OUT4− |
20 |
output 4− |
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PGND4 |
21 |
power ground 4 |
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OUT4+ |
22 |
output 4+ |
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VP4 |
23 |
supply voltage 4 |
handbook, halfpage
VP1 1 OUT1+ 2 PGND1 3
OUT1− 4
OUT2− 5
PGND2 6
OUT2+ 7
VP2 8
VDIAG 9
IN1 10
IN2 11
SGND 12 TDA8571J
IN3 13
IN4 14
MODE 15
VP3 16
OUT3+ 17
PGND3 18
OUT3− 19
OUT4− 20
PGND4 21
OUT4+ 22
VP4 23
MGM563
Fig.2 Pin configuration.
1998 Mar 13 |
4 |
Philips Semiconductors |
Preliminary specification |
|
|
4 x 40 W BTL quad car radio power
TDA8571J
amplifier
FUNCTIONAL DESCRIPTION
The TDA8571J contains four identical amplifiers which can be used for bridge applications. The gain of each amplifier is fixed at 34 dB.
Mode select switch (pin 15)
·Standby: low supply current (<100 mA)
·Mute: input signal suppressed
·Operating: normal on condition.
Since this pin has a low input current (<80 mA), a low cost supply switch can be applied.
To avoid switch-on plops, it is advised to keep the amplifier in the mute mode during ³150 ms (charging of the input capacitors at pins 10, 11, 13 and 14). When switching from standby to mute, the slope should be at least 18 V/s.
This can be realized by:
·Microprocessor control
·External timing circuit (see Fig.3).
Diagnostic output (pin 9)
DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the dynamic distortion detector becomes active and pin 9 goes LOW. This information can be used to drive a sound processor or DC volume control to attenuate the input signal and so limit the distortion. The output level of pin 9 is independent of the number of channels that are clipping (see Fig.4).
SHORT-CIRCUIT DIAGNOSTIC
When a short-circuit occurs at one or more outputs to ground or to the supply voltage, the output stages are switched off until the short-circuit is removed and the device is switched on again, with a delay of approximately 10 ms after removal of the short-circuit. During this short-circuit condition, pin 9 is continuously LOW.
When a short-circuit occurs across the load of one or more channels, the output stages are switched off during approximately 10 ms. After that time it is checked during approximately 50 ms to determine whether the short-circuit is still present.
Due to this duty cycle of 50 ms/10 ms the average current consumption during this short-circuit condition is very low.
During this short-circuit condition, pin 9 is LOW for 10 ms and HIGH for 50 ms (see Fig.5). The protection circuits of all channels are coupled. This means that if a short-circuit condition occurs in one of the channels, all channels are switched off. Consequently, the power dissipation in any short-circuit condition is very low.
TEMPERATURE PRE-WARNING
When the virtual junction temperature Tvj reaches 145 °C, pin 9 goes LOW.
OPEN COLLECTOR OUTPUTS
The diagnostic pin has an open collector output, so more devices can be tied together. An external pull-up resistor is needed.
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handbook, halfpageV |
MGG155 |
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+VP |
0 |
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10 kΩ |
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MODE |
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47 μF |
V9 |
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BZX79C/3.9V |
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MGD959 |
VP |
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Fig.3 Mode select switch circuitry. |
Fig.4 Distortion detector waveform. |
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1998 Mar 13 |
5 |
Philips Semiconductors |
Preliminary specification |
|
|
4 x 40 W BTL quad car radio power
TDA8571J
amplifier
short
MGG156
circuit current
t short-circuit over the load
V9 |
10 ms |
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VP
t 50 μs
Fig.5 Short-circuit waveform.
1998 Mar 13 |
6 |
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