TDF8599A NXP Semiconductors, TDF8599A Datasheet - Page 21

• Manufacturer Part Number: TDF8599A
• Description: The TDF8599A is a dual Bridge-Tied Load (BTL) car audio amplifier comprising anNDMOST-NDMOST output stage based on SOI BCDMOS technology
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDF8599A_2
Product data sheet
8.6.2.3 AC load detection
8.6.2.4 CLIP detection
AC load detection is only available in I
The default setting for bit IB3[D4] = 0 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.
CLIP detection gives information for clip levels
the clip detection circuitry on both channel 1 and channel 2. Setting either bit IB1[D5] or bit
IB2[D5] to logic 0 defines which channel reports clip information on the CLIP pin.
Fig 19. Recommended start-up sequence with DC load detection enabled
DB1[D4] = 1
DB2[D4] = 1
DB1[D6] = 1
IB1[D0] = 1
IB2[D2] = 1
IB1[D1] = 1
IB2[D1] = 1
IB1[D0] = 1
IB2[D2] = 0
IB1[D1] = 0
IB2[D1] = 0
COUNT = COUNT + 1
WAIT DC load
DC load valid
DB1[D6] = 1
COUNT = 0
I
I
I
2
2
2
C-bus RX
C-bus TX
C-bus TX
channel 1 open load
channel 2 open load
DC load valid
startup
enable DC load
disable channel 1
disable channel 2
startup
disable DC load
enable channel 1
enable channel 2
YES
Rev. 02 — 30 June 2009
I
NO
2
C-bus controlled dual channel class-D power amplifier
IB1[D0] = 1
IB2[D2] = 1
IB1[D1] = 1
IB2[D1] = 1
IB1[D0] = 1
IB2[D2] = 0
IB1[D1] = 1
IB2[D1] = 1
2
C-bus mode and is controlled using bit IB3[D4].
COUNT
I
I
2
2
C-bus TX
C-bus TX
COUNTMAX
0.2 %. Pin CLIP is used as the output for
startup
enable DC load
disable channel 1
disable channel 2
startup
disable DC load
disable channel 1
disable channel 2
NO
YES
TDF8599A
ERROR HANDLING
© NXP B.V. 2009. All rights reserved.
restart
DC load
start amplifier
anyway
001aaj061
21 of 54