The inductor and the output capacitor together
provide a low-pass filter. To simplify this process, Table 8-4 outlines possible inductor and capacitor value combinations for most
applications. Checked cells represent combinations that are proven for stability by
simulation and lab test. Check further combinations for each individual
application.
Table 8-4 Matrix of Output Capacitor and Inductor CombinationsNOMINAL L [µH](2) | NOMINAL COUT [µF](3) |
---|
10 | 2 x 10 or 1 x 22 | 47 | 100 |
---|
0.24 | + | +(1) | + | |
0.33 | + | + | + | |
0.47 | | | | |
(1) This LC combination is the standard value and recommended for most
applications. Other '+' marks indicate recommended
filter combinations. Other values can be
acceptable in some applications but must be fully
tested by the user.
(2) Inductor tolerance and current derating is anticipated. The effective inductance can vary by 20% and –30%.
(3) Capacitance tolerance and bias voltage derating is anticipated. The effective capacitance can vary by 20% and –50%.