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TDA8566TH Datasheet(Fiches technique) 5 Page - NXP Semiconductors

Numéro de pièce TDA8566TH
Description  2 x 40 W/2 ohm stereo BTL car radio power amplifier with differential inputs and diagnostic outputs
Télécharger  16 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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 5 page
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2001 Apr 24
5
Philips Semiconductors
Objective specification
2
× 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs
TDA8566TH
FUNCTIONAL DESCRIPTION
The TDA8566TH contains 2 identical amplifiers and can
be used for BTL applications. The gain of each amplifier is
fixed at 26 dB. Special features of this device are:
1. Mode select switch
2. Clip detection
3. Short-circuit diagnostic
4. Temperature pre-warning
5. Open-collector diagnostic outputs
6. Differential inputs.
Mode select switch (pin MODE)
• Standby: low supply current
• Mute: input signal suppressed
• Operating: normal on condition.
Since this pin has a very low input current (<40
µA), a low
cost supply switch can be applied. To avoid switch-on
plops, it is advisable to keep the amplifier in the mute mode
for a period of
≥150 ms (charging the input capacitors at
pins IN1+, IN1
−, IN2+ and IN2−). This can be realized by
using a microcontroller or by using an external timing
circuit as illustrated in Fig.7.
Clip detection (pin CLIP)
When clipping occurs at one or more output stages, the
dynamic distortion detector becomes active and pin CLIP
goes LOW. This information can be used to drive a sound
processor or a DC volume control to attenuate the input
signal and so limit the level of distortion. The output level
of pin CLIP is independent of the number of channels that
are being clipped. The clip detection circuit is disabled in a
short-circuit condition, so if a fault condition occurs at the
outputs, pin CLIP will remain at a HIGH level. The clip
detection waveforms are illustrated in Fig.3.
Short-circuit diagnostic (pin DIAG)
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 the removal of the short-circuit). During this
short-circuit condition, pin DIAG is continuously LOW.
When a short-circuit occurs across the load of one or both
channels, the output stages are switched off for
approximately 20 ms. After that time the load condition 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 the
short-circuit condition is very low (approximately 40 mA).
During this condition, pin DIAG is LOW for 20 ms and
HIGH for 50
µs; see Fig.4. The power dissipation in any
short-circuit condition is very low.
Temperature pre-warning (pin DIAG)
When the junction temperature (Tvj) reaches 145 °C,
pin DIAG will become continuously LOW.
Open-collector diagnostic outputs
Pins DIAG and CLIP are open-collector outputs, therefore
more devices can be tied together. Pins DIAG and CLIP
can also be tied together. An external pull-up resistor is
required.
Differential inputs
The input stage is a high-impedance fully differential
balanced input stage that is also capable of operating in
a single-ended mode with one of the inputs capacitively
coupled to an audio ground. It should be noted that if a
source resistance is added (input voltage dividers) the
CMRR degrades to lower values.
handbook, halfpage
0
VO
(V)
VCLIP
(V)
0
t (s)
MGU357
Fig.3 Clip detection waveforms.




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Numéro de composants électroniques

Numéro de pièceDescription des composantsHtml ViewFabricant
TDA8566Q2 x 25 W BTL stereo car radio power amplifier with differential inputs and diagnostic outputs 1 2 3 4 5 MoreNXP Semiconductors
TDA8560Q2 x 40 W/2 ohm stereo BTL car radio power amplifier with diagnostic facility 1 2 3 4 5 MoreNXP Semiconductors
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TDA8562Q4 x 12 W single-ended car radio power amplifier with dynamic distortion detector and diagnostic interface 1 2 3 4 5 MoreNXP Semiconductors
TDA1553Q2 x 22 W BTL stereo car radio power amplifier with loudspeaker protection 1 2 3 4 5 MoreNXP Semiconductors

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