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LM3481QMMX Datasheet(PDF) 10 Page - Texas Instruments

Part # LM3481QMMX
Description  LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM3481QMMX Datasheet(HTML) 10 Page - Texas Instruments

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<1
M2 - MC
M1 + MC
-
M2 - MC
'Vsamp1 = -
M1 + MC
'Vsamp0
+
_
PWM
Comparator
Control Signal
Compensation Ramp
-M2
-MC
DTS
(1-D)TS
M1
'Vsamp1
'Vsamp0
Steady State
Signal Vsamp
Perturbed Signal
VSL
Control
Signal
Vsamp
+
_
PWM
Comparator
Control Signal
-M2
DTS
(1-D)TS
M1
MC = 0
Steady State
Signal Vsamp
Perturbed Signal
'Vsamp1
'Vsamp0
<
1
M2
M1
-
LM3481
SNVS346E – NOVEMBER 2007 – REVISED APRIL 2012
www.ti.com
From the above equation, when D > 0.5,
ΔVsamp1 will be greater than ΔVsamp0. In other words, the disturbance is
divergent. So a very small perturbation in the load will cause the disturbance to increase. To ensure that the
perturbed signal converges we must maintain:
Figure 19. Sub-Harmonic Oscillation for D>0.5
Figure 20. Compensation Ramp Avoids Sub-Harmonic Oscillation
To prevent the sub-harmonic oscillations, a compensation ramp is added to the control signal, as shown in
Figure 20.
With the compensation ramp,
ΔVsamp1 and the convergence criteria are expressed by,
The compensation ramp has been added internally in the LM3481. The slope of this compensation ramp has
been selected to satisfy most applications, and it's value depends on the switching frequency. This slope can be
calculated using the formula:
MC = VSL x fS
In the above equation, VSL is the amplitude of the internal compensation ramp and fS is the controller's switching
frequency. Limits for VSL have been specified in the electrical characteristics section.
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 22) increases the amplitude of the compensation ramp as shown in Figure 21.
10
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Copyright © 2007–2012, Texas Instruments Incorporated
Product Folder Links: LM3481


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