Andreas (24.12.2010 13:43, просмотров: 146) ответил Dir на Вранье. Никогда LP2950/51 не допускал керамику на выходе. Поэтому он так и подешевел, когда появились большие керамические конденсаторы. Это уж вы поверьте, лично зондировал вопрос.
Да, облажался, недочитал.... Ceramic capacitors whose value is greater than 1000pF
should not be connected directly from the LP2951 output to
ground. Ceramic capacitors typically have ESR values in the
range of 5 to 10m?, a value below the lower limit for stable
operation (see curve Output Capacitor ESR Range).
The reason for the lower ESR limit is that the loop compen-
sation of the part relies on the ESR of the output capacitor to
provide the zero that gives added phase lead. The ESR of
ceramic capacitors is so low that this phase lead does not
occur, significantly reducing phase margin. A ceramic output
capacitor can be used if a series resistance is added (recom-
mended value of resistance about 0.1? to 2?).