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LM3488-Q1 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce LM3488-Q1
Description  High Efficiency Low-Side N-Channel Controller for Switching Regulators
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Site Internet  http://www.ti.com
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LM3488-Q1 Fiches technique(HTML) 11 Page - Texas Instruments

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'MC =
40x10
-6 . R
SL
.
FS
RSEN
Amps
second
LM3488
LM3488-Q1
www.ti.com
SNVS089M – JULY 2000 – REVISED MARCH 2013
Figure 24. Compensation Ramp Avoids Sub-Harmonic Oscillation
The compensation ramp has been added internally in LM3488. 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:
MC = VSL.FS Volts/second
(3)
In the above equation, VSL is the amplitude of the internal compensation ramp. Limits for VSL 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,
RSL(as shown in Figure 25) increases the slope of the compensation ramp, MC by :
(4)
In this equation,
ΔVSL is equal to 40.10
-6R
SL. Hence,
(5)
ΔVSL versus RSL has been plotted in Figure 26 for different frequencies.
Copyright © 2000–2013, Texas Instruments Incorporated
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