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UC1842A-SP Arkusz danych(PDF) 10 Page - Texas Instruments

Numer części UC1842A-SP
Szczegółowy opis  QML Class V, Current-Mode PWM Controller
Download  30 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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UC1842A-SP Arkusz danych(HTML) 10 Page - Texas Instruments

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UC1842A-SP, UC1843A-SP, UC1844A-SP
SLUS872D – JANUARY 2009 – REVISED MAY 2015
www.ti.com
Feature Description (continued)
Figure 2. Two-Loop Current-Mode Control System
For converters in which inductor current is continuous, controlling peak current is nearly equivalent to controlling
average current. Therefore, when such converters employ current-mode control, the inductor can be treated as
an error-voltage-controlled-current-source for the purposes of small-signal analysis (see Figure 3). The two-pole
control-to-output frequency response of these converters is reduced to a single-pole (filter capacitor in parallel
with load) response. One result is that the error amplifier compensation can be designed to yield a stable closed-
loop converter response with greater gain bandwidth than would be possible with pulse-width control, giving the
supply improved small-signal dynamic response to changing loads. A second result is that the error amplifier
compensation circuit becomes simpler, as shown in Figure 4. Capacitor Ci and resistor Ri, in Figure 4(A), add a
low-frequency zero, which cancels one of the two control-to-output poles of non-current-mode converters. For
large signal load changes, in which converter response is limited by inductor slew rate, the error amplifier
saturates while the inductor is catching up with the load. During this time, Ci charges to an abnormal level. When
the inductor current reaches its required level, the voltage on Ci causes a corresponding error in supply output
voltage. The recovery time is RizCi, which may be long. However, the compensation network of Figure 4(B) can
be used where current-mode control has eliminated the inductor pole. Large-signal dynamic response is then
greatly improved due to the absence of Ci.
Current limiting is greatly simplified with current-mode control. Pulse-by-pulse limiting is, of course, inherent in
the control scheme. Furthermore, an upper limit on the peak current can be established by simply clamping the
error voltage. Accurate current limiting allows optimization of magnetic and power semiconductor elements while
ensuring reliable supply operation.
Finally, current-mode controlled power stages can be operated in parallel with equal current sharing. This opens
the possibility of a modular approach to power supply design.
10
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