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TDA1566J

I²C-bus controlled dual channel 46 W/2Ω, single channel 92 W/1Ωamplifier with load diagnostic features

NXP Semiconductors. 

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.

Table 12. Interpretation of DC load detection bits

Open load bits

Amplifier load bits DC load valid bit

DB1[D4] and DB2[D4] DB1[D5] and DB2[D5] DB3[D3]

0

0

1

0

1

1

1

don’t care

1

Don’t care

don’t care

0

Description

amplifier load

line driver load

open load

invalid DC load

detection result

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 × Iref will set the AC load

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

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 × Iref 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.

0.78 × Iref

no AC load detected

200 mA

(peak)

1.22 × Iref

AC load detected

320 mA

(peak)

001aad 011

Fig 8. AC load detection limits

The levels presented refer to the advised value of 1500 Ω.

TDA1566_2

Product data sheet

Rev. 02 — 20 August 2007

© NXP B.V. 2007. All rights reserved.

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