Hi, All：
As the title, customer want to know that how to calculate the minimum value of input & output capacitance.
We just find a description about input & output capacitance as below, but customer need a formula that can calculate on different condition.
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8.2.1.2.2 Output Capacitor Selection
A ceramic capacitor with a 100-V voltage rating is recommended for the output capacitor. The DC-bias effect can reduce the effective capacitance by up to 80%, a consideration for capacitance value selection. Effectively the capacitance must be 33 μF for 600-mA loads. Another option is to use an aluminum electrolytic capacitor with low ESR and ceramic capacitor in parallel. Typically a 33-μF (ESR < 500 mΩ) with 10-μF (effective) ceramic capacitor in parallel is sufficient. If ESR is lower, capacitance for ceramic capacitor can be decreased.
For higher switching frequency (2.2 MHz) and boost output current below 400 mA, two 10-μF ceramic capacitors in parallel are sufficient.
8.2.1.2.3 Input Capacitor Selection
A ceramic capacitor with 50-V voltage rating is recommended for the input capacitor. The DC-bias effect can reduce the effective capacitance by up to 80%, a consideration for capacitance value selection. Effectively the capacitance must be 33 μF for 600-mA loads. Another option is to use an aluminum electrolytic capacitor with low ESR and ceramic capacitor in parallel. Typically a 33-μF (ESR < 500 mΩ) with 10-μF (effective) ceramic capacitor in parallel is sufficient. If ESR is lower, capacitance for ceramic capacitor can be decreased.
For higher switching frequency (2.2 MHz) and boost output current below 400 mA two 10-μF ceramic capacitors in parallel are sufficient.
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