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TPS82672SIPT Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS82672SIPT Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 30 page ( ) ( ) m c m B = 2 1 + m = 2 + ¦ ´ ¦ ´ ´ D ¦ ¦ c c ƒ = ƒ D d c ƒ m δ ƒ m = ƒ ´ ( ) ( ) h m f B f f m f B f m h m c f m × + × × = + D × = + × × = 1 2 ) ( 2 1 2 ( ) ) ( 2 1 2 m c f m f f m f B + D × = + × × = 0dBV 0dBVref F1 FENV,PEAK Dfc Dfc Non-modulatedharmonic Side-bandharmonics windowaftermodulation 11 TPS82670, TPS82671, TPS82672, TPS82673, TPS82674, TPS82675, TPS82676 TPS82677, TPS826711, TPS826716, TPS826721, TPS826745, TPS826765, TPS8267195 www.ti.com SLVSAI0J – OCTOBER 2010 – REVISED MAY 2016 Product Folder Links: TPS82670 TPS82671 TPS82672 TPS82673 TPS82674 TPS82675 TPS82676 TPS82677 TPS826711 TPS826716 TPS826721 TPS826745 TPS826765 TPS8267195 Submit Documentation Feedback Copyright © 2010–2016, Texas Instruments Incorporated Feature Description (continued) (1) Spectrum illustrations and formulae (Figure 8 and Figure 9) copyright IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, VOL. 47, NO.3, AUGUST 2005. See References Section for full citation. The spread spectrum architecture varies the switching frequency by approximately ±10% of the nominal switching frequency, thereby significantly reduces the peak radiated and conducting noise on both the input and output supplies. The frequency dithering scheme is modulated with a triangle profile and a modulation frequency fm. Figure 8. Spectrum Of A Frequency Modulated Sin. Wave With Sinusoidal Variation In Time Figure 9. Spread Bands Of Harmonics In Modulated Square Signals (1) Figure 8 and Figure 9 show that after modulation the sideband harmonic is attenuated when compared to the non-modulated harmonic, and when the harmonic energy is spread into a certain frequency band. The higher the modulation index (mf) the larger the attenuation. (1) With: fc is the carrier frequency (i.e. nominal switching frequency) fm is the modulating frequency (approx. 0.016*fc) δ is the modulation ratio (approx 0.1) (2) The maximum switching frequency is limited by the process and by the parameter modulation ratio ( δ), together with fm, which is the bandwidth of the side-band harmonics around the carrier frequency fc. The bandwidth of a frequency modulated waveform is approximately given by the Carson’s rule and can be summarized as: (3) fm < RBW: The receiver is not able to distinguish individual side-band harmonics; so, several harmonics are added in the input filter and the measured value is higher than expected in theoretical calculations. fm > RBW: The receiver is able to properly measure each individual side-band harmonic separately, so that the measurements match the theoretical calculations. |
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