Page 89 - Сигурност и отбрана - брой 2 - 2024

Security & Defense, Issue 2, 2024 Scientific journal

CONCLUSION
From the analysis of the graphs of the ripple attenuation coefficient at
the output of the LDO-type stabilizer, it can be seen that the ripple coefficient
(dB) indicator for microcircuits of the LT3045 type has its maximum value
when the frequency value is about 100 Hs. Due to subsequent increases in
frequency, this quantity is observed to decrease. This process can occur due
to the inter-cascade capacitances, as well as the mounting capacitance, which
were used during the design of the basic circuit of the microcircuit. The value
of this coefficient is within acceptable limits when the proposed power
source is used for mains frequency devices. During the application of
systems with operating frequency above 10 MHs, the value of knock
coefficient (dB) drops below 50 dB, which can be evaluated as deviations
from the permissible limits (Ugryumov, 2000).
In order to improve the quality indicators required by the series
connection scheme of the proposed pulse and LDO-type voltage stabilizers
in a wide range, it is possible to additionally apply the specified circuit
variants of the circuit of the LDO-type stabilizer with the regulating metal-
oxide-semiconductor transistor and the LDO-type stabilizer with the
regulating bipolar transistor.

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