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LM3478 Scheda tecnica(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM3478
Spiegazioni elettronici  High Efficiency Low-Side N-Channel Controller for Switching Regulator
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3478 Scheda tecnica(HTML) 10 Page - National Semiconductor (TI)

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Functional Description (Continued)
SLOPE COMPENSATION RAMP
The LM3478 uses a current mode control scheme. The main
advantages of current mode control are inherent cycle-by-
cycle current limit for the switch, and simpler control loop
characteristics. It is also easy to parallel power stages using
current mode control since current sharing is automatic.
Current mode control has an inherent instability for duty
cycles greater than 50%, as shown in Figure 2.In Figure 2,
a small increase in the load current causes the switch cur-
rent to increase by
∆I
O. The effect of this load change,
∆I
1,is
:
From the above equation, when D > 0.5,
∆I
1 will be greater
than
∆I
O. In other words, the disturbance is divergent. So a
very small perturbation in the load will cause the disturbance
to increase.
To prevent the sub-harmonic oscillations, a compensation
ramp is added to the control signal, as shown in Figure 3.
With the compensation ramp,
10135507
FIGURE 1. Basic Operation of the PWM comparator
10135509
FIGURE 2. Sub-Harmonic Oscillation for D>0.5
www.national.com
10


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