Datasheet
Sensitivity of zero-ripple current condition AN3180
12/39 Doc ID 17273 Rev 1
Figure 7. Ripple-current attenuation as a function of the error sources for various
winding coupling
5. A resonance frequency, close to:
Equation 12
for small zero-ripple condition mismatches, exists where the gain peaks and attenuation
may be lost. However, the parasitic resistances damp this peak so that it is not high, even
though its effect might be visible in the waveforms, should that frequency be stimulated;
anyhow, to get the desired attenuation at the switching frequency and above, the practical
values of C
S
are such that the peak occurs at a much lower frequency, where EMC
regulations do not generally apply.
!-V
N
N
N
N
G
>@
$>G%@
Y
Y
N
N
N
N
G
>
@
$>G%@
Y
Y
N
N
N
N
$
>G%@
Y
Y
G
>@
N
N
N
N
G
>
@
$
>G%@
Y
Y
S1
r
CL2
1
f
π
=