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Question

What must be taken into account to construct a phase compensation circuit?

Answer

LDO Linear RegulatorsHow to use

In LDO regulators, phase compensation is provided to secure stable operation even when the load current is varied.
For this purpose, use a capacitor COUT with good frequency characteristics and proper ESR (Equivalent Series Resistance), value in the hatched area.

If a capacitor with large ESR value, especially a tantalum type capacitor, is used, the output might be unstable. Evaluate a circuit including consideration of frequency characteristics.
Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature characteristics are different. Evaluate the circuit taking actual characteristics into account.

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