GM1112 데이터 시트보기 (PDF) - Gamma Microelectronics Inc.
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GM1112 Datasheet PDF : 8 Pages
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GM11125
1A LOW DROPOUT
PRECISION VOLTAGE REGULATOR
Application Information
Stability Considerations
A capacitor of 10uF as a minimum is suggested to be connected in the input terminal and to be as
close as to the input source for better stability consideration. See typical application circuit page 1 for
reference.
The output compensation capacitor helps to determine three main characteristics of a linear
regulator's performance: start-up delay, load transient response, and loop stability. The capacitor
value and type is based on cost, availability, size and temperature constraints. A tantalum or aluminum
electrolytic capacitor is preferred, as a film or ceramic capacitor with almost zero ESR can cause
instability. An aluminum electrolytic capacitor is the least expensive type, but when the circuit operates
at low temperatures, both the value and ESR of the capacitor will vary widely. For optimum
performance over the full operating temperature range, a tantalum capacitor is best. A 22µF tantalum
capacitor will work fine in most applications, but with high current regulators such as the GM1112,
higher capacitance values will improve the transient response and stability. Most applications for the
GM1112 involve large changes in load current, so the output capacitor must supply instantaneous load
current. The ESR of the output capacitor causes an immediate drop in output voltage given by:
△V = △I X ESR
In microprocessor applications an output capacitor network of several tantalum and ceramic capacitors
in parallel is commonly used. This reduces overall ESR and minimizes the instantaneous output
voltage drop under transient load conditions. The output capacitor network should be placed as close
to the load as possible for the best results.
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