The inductor and output capacitor together provide a low-pass filter. To simplify this process, Table 8-3 outlines possible inductor and capacitor value combinations. Checked cells represent combinations that are proven for stability by simulation and lab test. Check further combinations for each individual application.
Table 8-3 Matrix of Output Capacitor and Inductor Combinations for TPS62A03VOUT [V] | L [µH](1) | COUT [µF](2) |
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22 | 2 × 22 |
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0.6 ≤ VOUT < 1.2 | 1 | + | ++(3) |
1.2 ≤ VOUT < 1.8 | 1 | ++(3) | + |
1.8 ≤ VOUT | 1 | ++(3) | + |
(1) Inductor tolerance and current derating is anticipated. The effective inductance can vary by +20% and –30%. A 0.47uH inductor can also be used with the same recommended output capacitors for the TPS62A03.
(2) Capacitance tolerance and bias voltage derating is anticipated. The effective capacitance can vary by +20% and –50%. In case a lower output ripple is desired, higher output capacitance can help reduce the ripple.
(3) This LC combination is the standard value and recommended for most applications.