TDA8564Q Datasheet, PDF (3/15 Pages) NXP Semiconductors – 2 x 24 W BTL or 4 x 12 W single-ended car radio power amplifier

Philips Semiconductors
2 × 24 W BTL or 4 × 12 W single-ended car
radio power amplifier
Preliminary specification
TDA8564Q
PINNING
SYMBOL
−INV1
SGND
INV2
SVRR
V_P1
OUT1
GND1
OUT2
n.c.
OUT3
GND2
OUT4
V_P2
MODE
INV3
V_DIAG
−INV4
PIN
DESCRIPTION
1 non-inverting input 1
2 signal ground
3 inverting input 2
4 supply voltage ripple rejection
5 supply voltage 1
6 output 1
7 power ground 1
8 output 2
9 not connected
10 output 3
11 power ground 2
12 output 4
13 supply voltage 2
14 mode select switch input
15 inverting input 3
16 diagnostic output
17 non-inverting input 4
FUNCTIONAL DESCRIPTION
The TDA8564Q contains four identical amplifiers which
can be used for single-ended or bridge applications. The
gain of each amplifier is fixed at 40 dB (46 dB in BTL).
Special features of the device are as follows.
handbook, halfpage
INV1 1
SGND 2
INV2 3
SVRR 4
V _P1 5
OUT1 6
GND1 ₇
OUT2 8
n.c. 9 TDA8564Q
OUT3 10
GND2 11
OUT4 12
V _{P2 13}
MODE 14
INV3 15
V _{DIAG 16}
INV4 ₁₇
MLC810
Fig.2 Pin configuration.
Mode select switch (pin 14)
• Low standby current (<100 µA)
• Low switching current (low cost supply switch)
• Mute facility.
To avoid switch-on plops, it is advised to keep the amplifier
in the mute mode during ≥100 ms (charging of the input
capacitors at pins 1, 3, 15 and 17).
This can be achieved by:
• Microcontroller control
• External timing circuit (see Fig.3).
The circuit in Fig.3 slowly ramps up the voltage at the
mode select switch pin when switching on and results in
fast muting when switching off.
In the event of fast switching at mode select pin it is
advised to increase the ¹â„₂V_P decoupling capacitor (pin 4)
to 150 µF to avoid switch plops.
handbook, halfpage ^VP
10 kΩ
47 µF
10 kΩ
mode
select
switch
100 kΩ
MGA708
Fig.3 Mode select switch circuitry.
February 1995
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