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TDA1566_15 데이터시트(Datasheet) 11 Page - NXP Semiconductors

부품명 TDA1566_15
상세내용  I2C-bus controlled dual channel 46 W/2 W, single channel 92 W/1 W amplifier with load diagnostic features
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제조사  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
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TDA1566_2
© NXP B.V. 2007. All rights reserved.
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
0
1
amplifier load
0
1
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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