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TPS826745SIPR Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS826745SIPR
Description  600-mA, High-Efficiency MicroSiP Step-Down Converter (Profile <1.0mm)
Download  30 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS826745SIPR Datasheet(HTML) 11 Page - Texas Instruments

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Non-modulatedharmonic
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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
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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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