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TDF8599 数据表(PDF) 21 Page - NXP Semiconductors

部件名 TDF8599
功能描述  I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier with load diagnostics
PDF  52 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

TDF8599 数据表(HTML) 21 Page - NXP Semiconductors

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TDF8599_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 13 November 2008
21 of 52
NXP Semiconductors
TDF8599
Class-D power amplifier with load diagnostics
8.6.2.3
AC load detection
AC load detection is only available in I2C-bus mode and is controlled using bit IB3[D4].
The default setting for bit IB3[D4] = 0 which disables AC load detection. When AC load
detection is enabled (bit IB3[D4] = 1), the amplifier load current is measured and
compared with a reference level. Pin CLIP is activated when this threshold is reached.
Using this information, AC load detection can be performed using a predetermined input
signal frequency and level. The frequency and signal level should be chosen so that the
load current exceeds the programmed current threshold when the AC coupled load
(tweeter) is present.
8.6.2.4
CLIP detection
CLIP detection gives instantaneous information for clip levels
≥ 1 %. Pin CLIP is used as
the output for the clip detection circuitry on both channel 1 and channel 2. Setting either
bit IB1[D5] or bit IB2[D5] defines which channel reports clip information on the CLIP pin.
Fig 20. Recommended start-up sequence with DC load detection enabled
001aaj061
NO
NO
YES
YES
restart
DC load
start amplifier
anyway
I2C-bus TX
IB1[D0] = 1
startup
IB2[D2] = 1
enable DC load
IB1[D1] = 1
disable channel 1
IB2[D1] = 1
disable channel 2
I2C-bus RX
DB1[D4] = 1
ch1 openload
DB2[D4] = 1
ch2 openload
DB1[D6] = 1
DC load valid
I2C-bus TX
IB1[D0] = 1
startup
IB2[D2] = 0
disable DC load
IB1[D1] = 0
enable channel 1
IB2[D1] = 0
enable channel 2
I2C-bus TX
IB1[D0] = 1
startup
IB2[D2] = 0
disable DC load
IB1[D1] = 1
disable channel 1
IB2[D1] = 1
disable channel 2
I2C-bus TX
IB1[D0] = 1
startup
IB2[D2] = 1
enable DC load
IB1[D1] = 1
disable channel 1
IB2[D1] = 1
disable channel 2
ERROR HANDLING
COUNT = 0
WAIT DC load
COUNT = COUNT + 1
DB1[D6] = 1
DC load valid
COUNT
≤ COUNTMAX



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