TDA1566TH datasheet(11/46 Pages) NXP

No de pièce	TDA1566TH

Description	I2C-bus controlled dual channel 46 W/2 OHM, single channel 92 W/1 OHM amplifier

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TDA1566_2

Product data sheet

Rev. 02 — 20 August 2007

11 of 46

NXP Semiconductors

TDA1566

I2C-bus controlled dual channel/single channel ampliﬁer

Rtrip1 = 0.1 × (RPROG − 720) Ω

Rtrip2 = 1.05 × (RPROG − 450) Ω

Rtrip1 and Rtrip2 levels presented refer to the advised value of 1500 Ω. Note that a shorted

load will be interpreted as an ampliﬁer load.

The result of the DC load detection is stored in DB1[D4] and DB1[D5] for channel 1 and in

DB2[D4] and DB2[D5] for channel 2, see Table 12.

Note that the DC load bits are only valid if DB3[D3] = 1. The DC load detection valid bit is

reset, DB3[D3] = 0, when the DC load detection is started with a not completely

discharged SVR capacitor (VSVR > 0.3 V) or when the DC load detection is interrupted by

an engine start (VP < 7.5 V typical, see Section 9).

6.2.2 AC load detection

The AC load detection is used to detect if AC coupled speakers like tweeters are

connected correctly during assembly. The detection starts when IB1[D2] changes from

LOW to HIGH. A sine wave of a certain frequency (e.g. 19 kHz) needs to be applied to the

inputs of the ampliﬁer. The output voltage over the load impedance will cause an output

current in the ampliﬁer. Output currents larger than 1.15

× I

ref will set the AC load

detection bit and no AC load is detected when the output current is less than 0.85

× I

ref,

see Figure 8. The reference current Iref is set with an external resistor RPROG (1 %)

connected between the PROG pin and GND. The relation between RPROG and Iref is given

by:

Iref = 390 / RPROG [A] (valid for RPROG between 1.2 kΩ and 4 kΩ).

To set the AC load detection bit the peak output current must pass the 1.15

× I

ref threshold

three times. The three ‘threshold cross’ counter is used to prevent false AC load detection

caused by switching the input signal on or off. To reset the slope counter, IB1[D2] needs to

be reset. With RPROG = 1500 Ω the current thresholds are set to 200 mA and 320 mA.

The levels presented refer to the advised value of 1500

Ω.

Table 12.

Interpretation of DC load detection bits

Open load bits

DB1[D4] and DB2[D4]

Ampliﬁer load bits

DB1[D5] and DB2[D5]

DC load valid bit

DB3[D3]

Description

0

1

ampliﬁer load

0

1

line driver load

1

don’t care

1

open load

Don’t care

don’t care

0

invalid DC load

detection result

Fig 8.

AC load detection limits

001aad011

200 mA

(peak)

0.78

× Iref

1.22

× Iref

320 mA

(peak)

no AC load detected

AC load detected

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Fabricant	No de pièce	Fiches technique	Description
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