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LM3478MMX データシート(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM3478MMX
部品情報  High Efficiency Low-Side N-Channel Controller for Switching Regulator
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3478MMX データシート(HTML) 11 Page - National Semiconductor (TI)

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Functional Description (Continued)
The compensation ramp has been added internally in
LM3478. The slope of this compensation ramp has been
selected to satisfy most of the applications. The slope of the
internal compensation ramp depends on the frequency. This
slope can be calculated using the formula:
M
C =VSL.FS Volts/second
In the above equation, V
SL is the amplitude of the internal
compensation ramp. Limits for V
SL have been specified in
the electrical characteristics.
In order to provide the user additional flexibility, a patented
scheme has been implemented inside the IC to increase the
slope of the compensation ramp externally, if the need
arises. Adding a single external resistor, R
SL(as shown in
Figure 4) increases the slope of the compensation ramp, M
C
by :
In this equation,
∆V
SL is equal to 40.10
-6R
SL. Hence,
∆V
SL versus RSL has been plotted in Figure 5 for different
frequencies.
10135511
FIGURE 3. Compensation Ramp Avoids Sub-Harmonic Oscillation
www.national.com
11


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同様の説明 - LM3478MMX

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