BASIC VARIANTS
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5
Figure 28. Inductance as function of current (relative values).
The typical tolerance for inductance is ±10%. Also smaller tolerance can be achieved, if needed. In
the DC/DC converter, inductance tolerance does not affect the current balance between legs like in
standard AC applications. Because of tolerance, switching frequency is not totally eliminated from
the output current. This will increase the ripple and can cause some resonance issues with optional
filtering capacitors. Tolerances also increase/decrease individual peak-to-peak ripple currents of
chokes (Figure 29 and Figure 30). Temperature tolerances are not typically a concern with the above
mentioned choke types if all chokes are of the same temperature.
L [H]
I [A]
Powder 1
Powder 2
Laminated iron
L
NOM
L
SAT
I
NOM, RMS
I
NOM, PEAK
L
MAX, PEAK
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