TDA8511JDBS17Pplastic DIL-bent-SIL power package; 17 leads (lead length 12 mm)SOT243-1
2000 Mar 102
Philips SemiconductorsPreliminary specification
4 × 13 W single-ended power amplifiersTDA8511J
BLOCK DIAGRAM
V
V
P1
handbook, full pagewidth
input 1
1
60
kΩ
2
kΩ
mute switch
VA
C
m
5
TDA8511J
P2
13
6
output 1
input 2
supply voltage
ripple rejection
input 3
18 kΩ
mute switch
60
kΩ
3
2
kΩ
x1
4
15
60
kΩ
2
kΩ
18 kΩ
stand-by
switch
VA
15 kΩ
15 kΩ
VA
V
P
mute switch
VA
C
m
PROTECTIONS
thermal
short-circuit
mute
reference
voltage
C
power stage
8
output 2
power stage
mode
14
select
stand-by
reference
voltage
mute
switch
m
switch
16
diagnostic
output
10
output 3
18 kΩ
input 4
mute switch
60
kΩ
17
2
kΩ
input
reference
voltage
2711
ground
(signal)
VA
18 kΩ
9
not connected
C
GND1GND2
Fig.1 Block diagram.
2000 Mar 103
power stage
m
12
output 4
power stage
MGL497
power ground (substrate)
Philips SemiconductorsPreliminary specification
4 × 13 W single-ended power amplifiersTDA8511J
PINNING
SYMBOLPINDESCRIPTION
IN11input 1
SGND2signal ground
IN23input 2
RR4supply voltage ripple rejection
V
P1
5supply voltage
OUT16output 1
GND17power ground 1
OUT28output 2
n.c.9not connected
OUT310output 3
GND211power ground 2
OUT412output 4
V
P2
13supply voltage
MODE14mode select switch input
IN315input 3
V
DIAG
16diagnostic output
IN417input 4
handbook, halfpage
IN1
SGND
IN2
RR
V
OUT1
GND1
OUT2
n.c.
OUT3
GND2
OUT4
V
MODE
IN3
V
DIAG
IN4
P1
P2
1
2
3
4
5
6
7
8
9
TDA8511J
10
11
12
13
14
15
16
17
MGL498
FUNCTIONAL DESCRIPTION
The TDA8511J contains four identical amplifiers and can
be used for single-ended applications. The gain of each
amplifier is fixed at 20 dB. Special features of the device
are:
• Mode select switch (pin 14)
• Diagnostic output (pin 16).
Mode select switch (pin 14)
• Low standby current (<100 µA)
• Low switching current (low cost supply switch)
• Mute facility.
Toavoidswitch-onplops,itisadvisedtokeeptheamplifier
in the mute mode during ≥100 ms (charging of the input
capacitors at pin 1, 3, 15 and pin 17).
2000 Mar 104
Fig.2 Pin configuration.
This can be achieved by:
• Microprocessor control
• External timing circuit (see Fig.7).
Diagnostic output (pin 16)
DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin 16
goes LOW. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and thus limit the distortion. The output level of
pin 16 is independent of the number of channels that are
clipping (see Fig.3).
Philips SemiconductorsPreliminary specification
4 × 13 W single-ended power amplifiersTDA8511J
SHORT-CIRCUIT PROTECTION
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
20 ms, after removal of the short-circuit. During this
short-circuit condition, pin 16 is continuously LOW.
When a short-circuit across the load of one or more
channels occurs the output stages are switched off during
approximately 20 ms. After that time it is checked during
approximately 50 µs to see whether the short-circuit is still
present. Due to this duty cycle of 50 µs/20 ms the average
current consumption during this short-circuit condition is
very low (approximately 40 mA).
During this short-circuit condition, pin 16 is LOW for 20 ms
and HIGH for 50 µs (see Fig.4).
handbook, halfpage
V
O
0
V
16
V
P
0
MGA706
t
The power dissipation in any short-circuit condition is very
low.
TEMPERATURE DETECTION
When the virtual junction temperature Tvjreaches 150 °C,
pin 16 will be active LOW.
handbook, full pagewidth
current
in
output
stage
V
16
short-circuit over the load
V
P
Fig.3 Distortion detector waveform.
OPEN COLLECTOR OUTPUT
Pin 16 is an open collector output, which allows that more
devices can be connected together (pins 16).
MGL508
t
20 ms
50 µs
Fig.4 Short-circuit waveform.
2000 Mar 105
t
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