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TAS5414 Datasheet(PDF) 28 Page - Texas Instruments |
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TAS5414 Datasheet(HTML) 28 Page - Texas Instruments |
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28 / 44 page  www.ti.com EMI Considerations AM Radio EMI Reduction Operating States TAS5414 TAS5424 SLOS514 – FEBRUARY 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 Ω, 1% tolerance Rext resistor. Table 21. Recommended Switching Frequencies for AM Mode Operation US EUROPEAN SWITCHING SWITCHING AM FREQUENCY AM FREQUENCY FREQUENCY FREQUENCY (kHz) (kHz) (kHz) (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 Stopped Stopped OFF Hi-Z Hi-Z, weak pulldown Active Active Active ON Mute Switching at 50% Active Active Active ON Normal operation Switching with audio Active Active Active ON Table 23. Global Faults and Actions LATCHED/ FAULT/ FAULT/EVENT MONITORING REPORTING ACTION 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 None Self-clearing OT Thermal fault Hi-Z, mute, normal I2C + FAULT pin Hard mute Standby Self-clearing 28 Submit Documentation Feedback |
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