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TDA8569Q 데이터시트(PDF) 5 Page - NXP Semiconductors

부품명 TDA8569Q
상세설명  4X40 W BTL quad car radio power amplifier
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8569Q 데이터시트(HTML) 5 Page - NXP Semiconductors

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2003 Aug 08
5
Philips Semiconductors
Product specification
4
× 40 W BTL quad car radio
power amplifier
TDA8569Q
FUNCTIONAL DESCRIPTION
The TDA8569Q contains four identical amplifiers which
can be used for bridge applications. The gain of each
amplifier is fixed at 26 dB.
Mode select switch (pin MODE)
• Standby: low supply current (<100 µA)
• Mute: input signal suppressed
• Operating: normal on condition.
Since this pin has a low input current (<80
µA), 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
≥150 ms (charging of the input
capacitors at pins IN1, IN2, IN3 and IN4).
This can be realized by:
• Microprocessor control
• External timing circuit (see Fig.3).
Diagnostic output (pin VDIAG)
DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin VDIAG
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 VDIAG 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 VDIAG is continuously LOW.
When a short-circuit occurs across the load of one or more
channels, the output stages are switched off for
approximately 10 ms. After that time it is checked during
approximately 50
µs to determine whether the short-circuit
is still present. Due to this duty cycle of 50
µs/10 ms the
average current consumption during this short-circuit
condition is very low.
During this short-circuit condition, pin VDIAG is LOW for
10 ms and HIGH for 50
µs (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 VDIAG 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.
Fig.3 Mode select switch circuitry.
handbook, halfpage
100 k
MGA708
47
µF
10 k
100
mode
select
switch
VP
handbook, halfpage
VDIAG
0
VP
Vo
0
t
MCE461
Fig.4 Distortion detector waveform.


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