TDA8591J datasheet(9/36 Pages) PHILIPS

部件名	TDA8591J

功能描述	4 X 44 W into 4 or 4 X 75 W into 2 quad BTL car radio power amplifier

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制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

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9 / 36 page

2002 Jan 14

9

Philips Semiconductors

Preliminary speciﬁcation

4

× 44 W into 4 Ω or 4 × 75 W into 2 Ω

quad BTL car radio power ampliﬁer

TDA8591J

7.2

Diagnostic output (DIAG)

The internal circuit of the diagnostic open-drain output is

shown in Fig.7.

A pull-up resistor is required if the diagnostic output is

connected to a microcontroller. Figure 8 shows four

possible solutions for fault diagnosis.

Figures 8a and 8b show simple configurations. The output

offset diagnostic cannot trigger the microcontroller

because of the 4-diode stack, only the temperature,

short-circuit and dynamic distortion diagnostic will give an

input LOW level for the microcontroller.

In Fig.8c, the diagnostic output is connected to an external

level shifter. Now DIAG pin output can also generate an

input LOW level for the microcontroller.

Assuming that a microcontroller HIGH input level must be

equal to, or greater than 2 V, the following equations are

used to calculate values for resistors R1 and R2:

VIN1 > 2 V and

where:

5 V is the pull-up supply voltage

Vd is the forward voltage of a diode (0.6 V)

R1 and R2 are the resistors in the level shifter.

Using both equations:

thus R1 > 3.3 R2

Therefore, R1 can be 47 k

Ω and R2 can be 10 kΩ.

The level shifter shown in Fig.8d is used as a 2-bit

analog-to-digital converter.

With reference to Figs 7 and 8c, the truth table in Table 1

can be made:

Table 1

Truth table.

V

IN1

5V

4

V

d

R2

5V

4

V

d

×

–

R1

R2

+

-------------------------------





×

–

×

–

=

R1

2R2

×

5V

4

V

d

2

–

×

–

----------------------------------------

>

HIGH TEMPERATURE

OR SHORT-CIRCUIT OR

DDD

OFFSET

IN1

IN2

no

1

no

yes

0

1

yes

don’t care

0

handbook, halfpage

MGT610

≥1

DIAG

PGND

temperature diagnostic

short-circuit diagnostic

dynamic distortion detection

output offset diagnostic

Fig.7 Internal circuit diagnostic output pin DIAG.

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类似说明 - TDA8591J

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