TLD5190QV Datasheet, PDF (47/58 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller for High Power LED Lighting

H-Bridge DC/DC Controller
TLD5190QV
Infineon FLAT SPECTRUM Featureset
11.4
Spread Spectrum
The Spread Spectrum modulation technique significantly improves the lower frequency range of the spectrum
(f<30MHz).
By using the spread spectrum technique, it is possible to optimize the input filter only for the peak limits, and also
pass the average limits (average emission limits are -20dB lower than the peak emission limits). By using spread
spectrum, the need for low ESR input capacitors is relaxed because the input capacitor series resistor is important
for the low frequency filter characteristic. This can be an economic benefit if there is a strong requirement for
average limits.
The TLD5190QV features a built in Spread Spectrum function which can be enabled via an external Pin
(SPREAD_SPECTRUM = HIGH). The modulation frequency f_FM, P_11.6.3 and the deviation frequency f_dev, P_11.6.2
are internally fixed. Refer to Figure 29 for more details.
Note: The Spread Spectrum function can not be used when the synchronization pin is used.
f_SW
f_dev
t
1
f _FM
Figure 29 Spread Spectrum Overview
Data Sheet
47
Rev. 1.0, 2016-05-20