TDA8594SD 데이터 시트보기 (PDF) - NXP Semiconductors.

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TDA8594SD

I2C-bus controlled 4×50 W power amplifier

NXP Semiconductors. 

NXP Semiconductors

TDA8594

I2C-bus controlled 4 × 50 W power amplifier

VO

I2C-bus mode only

(V)

VP

14.4

8.8

8.6

7.2

5.0

3.5

0

POR

IB1 bit D0

DIAG

output voltage

(1)

(2)

VSVR

(1) Low VP mute activated.

(2) VPOR: VP level at which Power-On Reset (POR) is activated.

Fig 9. Low VP behavior; I2C-bus mode only

t (s)

001aad185

7.11 Overvoltage and load dump protection

When the battery voltage VP is higher than 22 V, the amplifier stage will be switched to

high-impedance. The TDA8594 is protected against load dump voltage with supply

voltage up to 50 V.

7.12 Thermal pre-warning and thermal protection

If the average junction temperature reaches a level that is adjustable via the I2C-bus,

selected with IB3[D4], the pre-warning will be activated resulting in a LOW level on

pin DIAG (if selected) and can be read out via the I2C-bus. The default setting for the

thermal pre-warning is IB3[D4] = 0 setting the warning level at 145 °C. In legacy mode the

thermal pre-warning is set at 145 °C.

If the temperature increases further, the temperature controlled gain reduction will be

activated for all four channels to reduce the output power (see Figure 10). If this does not

reduce the average junction temperature, all four channels will be switched off at the

absolute maximum temperature Toff, typical 175 °C.

TDA8594_2

Product data sheet

Rev. 02 — 11 December 2007

© NXP B.V. 2007. All rights reserved.

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