TDA8595 데이터 시트보기 (PDF) - NXP Semiconductors.

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TDA8595

I2C-bus controlled 4×45 W power amplifier

NXP Semiconductors. 

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 µs.

• 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.

TDA8595_2

Product data sheet

Rev. 02 — 21 November 2007

© NXP B.V. 2007. All rights reserved.

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