參數(shù)資料
型號(hào)： TAS5414TDKDRQ1G4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 116 W, 4 CHANNEL, AUDIO AMPLIFIER, PDSO36
封裝： GREEN, PLASTIC, HSSOP-36
文件頁(yè)數(shù)： 21/43頁(yè)
文件大小： 978K
代理商： TAS5414TDKDRQ1G4
www.ti.com
EMI Considerations
AM Radio EMI Reduction
Operating States
SLOS514A – FEBRUARY 2007 – REVISED JULY 2007
Automotive level EMI performance depends on both careful integrated circuit design and good system level
design. Controlling sources of electromagnetic interference (EMI) was a major consideration in all aspects of the
TAS5414 and TAS5424 design.
The TAS5414 and TAS5424 have minimal parasitic inductances due to the short leads on the PSOP3 package.
This dramatically reduces the EMI that results from current passing from the die to the system PCB. Each
channel of the TAS5414 and TAS5424 also operates at a different phase. The phase between channels is I2C
selectable to either 45
° or 90°, to reduce EMI caused by high-current switching. The TAS5414 and TAS5424
incorporate patent-pending circuitry that optimizes output transitions that cause EMI.
To reduce interference in the AM radio band, the TAS5414 and TAS5424 have the ability to change the
switching frequency via I2C commands. The recommended frequencies are listed in Table 21. The fundamental
frequency and its second harmonic straddle the AM radio band listed. This eliminates the tones that can be
present due to the switching frequency being demodulated by the AM radio. To function properly, AM avoidance
requires the use of a 20-k
, 1% tolerance Rext resistor.
Table 21. Recommended Switching Frequencies for AM Mode Operation
US
EUROPEAN
SWITCHING
AM FREQUENCY
FREQUENCY
(kHz)
522-540
417
540–917
500
540–914
500
917–1125
417
914–1122
417
1125–1375
500
1122–1373
500
1375–1547
417
1373–1548
417
1547–1700
357
1548–1701
357
The operating regions, or states, of the TAS5414 and TAS5424 are depicted in the following tables.
Table 22. Operating States and Supplies
STATE NAME
OUTPUT FETS
CHARGE PUMP
OSCILLATOR
I2C
AVDD and DVDD
STANDBY
Hi-Z, floating
Stopped
OFF
Hi-Z
Hi-Z, weak pulldown
Active
ON
Mute
Switching at 50%
Active
ON
Normal operation
Switching with audio
Active
ON
Table 23. Global Faults and Actions
LATCHED/
FAULT/
FAULT/EVENT
MONITORING
REPORTING
ACTION
SELF-
EVENT
CATEGORY
MODES
METHOD
TYPE
RESULT
CLEARING
POR
Voltage fault
All
FAULT pin
Hard mute (no ramp)
Standby
Self-clearing
UV
Hi-Z, mute, normal
I2C + FAULT pin
Hi-Z
CP UV
Hi-Z
OV
Hi-Z
Load dump
All
FAULT pin
Standby
OTW
Thermal warning
Hi-Z, mute, normal
I2C + CLIP_OTW pin
None
Self-clearing
OT
Thermal fault
Hi-Z, mute, normal
I2C + FAULT pin
Hard mute
Standby
Self-clearing
28
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