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TDA8595 データシート(PDF) 7 Page - NXP Semiconductors

部品番号 TDA8595
部品情報  I2C-bus controlled 4 ??45 W power amplifier
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8595 データシート(HTML) 7 Page - NXP Semiconductors

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TDA8595
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 11 June 2013
7 of 51
NXP Semiconductors
TDA8595
I2C-bus controlled 4
 45 W power amplifier
7.1 Input stage
The input stage is a high-impedance pseudo-differential input stage. The negative inputs
of the four channels are combined on the ACGND pin. For the best performance on
supply voltage ripple rejection and pop noise, the capacitor connected to the ACGND pin
must be four times the value of the input capacitor (or as close to the value as possible).
7.2 Output stage
The output stage of each amplifier channel consists of two PMOS power transistors and
two NMOS transistors in BTL configuration. The process used is the BCDMOS process
with an isolated substrate, SOI process, which has almost no parasitic components and
therefore prevents latch-up.
7.3 Distortion (clip-) detection
If the output of the amplifier starts clipping to the supply voltage or to ground, the output
will become distorted. If the distortion per channel exceeds a selectable threshold (2 %,
5 % or 10 %), one of the two diagnostic pins (DIAG pin or STB pin) will be activated. To be
able to detect if, for instance, the front channels (channel 1 and channel 3) or rear
channels (channel 2 and channel 4) are clipping, the clip information can be directed per
channel to the DIAG pin or the STB pin. It is possible to have only the clip information on
the diagnostic pins by disabling the temperature and load information on the diagnostic
pin. In this mode the temperature and load protection are still functional but can only be
read via the I2C-bus.
7.4 Output protection and short-circuit operation
When a short-circuit to ground, VP or across the load occurs on one or more outputs of an
amplifier, only the amplifier with the short-circuit is switched off. The channel that has a
short-circuit and the type of short-circuit can be read-back via the I2C-bus. If the
diagnostic pin is enabled for load fault information (IB2[D4] = 0) the DIAG pin will be
pulled LOW. After 16 ms the amplifier will be switched on again and, if the short-circuit
conditions still occur, the amplifier will be switched off.
The 16 ms cycle will reduce the dissipation. To prevent audible distortion, the amplifier
channel with the short-circuit can be disabled via the I2C-bus.
7.5 SOAR protection
The output transistors are protected by Safe Operating ARea (SOAR) protection. The
TDA8595 has a two-stage SOAR protection:
If the differential output voltage across the load is less than 1 V, and the current
through the load is more than 4 A, the amplifier channel will be switched off during
16 ms. To prevent incorrect switch-off with an inductive load or very high input signals,
the condition (Vo < 1 V and IL > 4 A) must exist for more than 300 s.
If the differential output voltage across the load is more than 1 V, and the current
through the load is more than 8 A, the amplifier channel will be switched off during
16 ms.


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