Sp6691 Remote Control 100khz Infrared Led Driver


Posted on Feb 6, 2014

Loop stability analysis usually starts from an open-loop Bode plot of the plant under study, e. g. the power stage of a buck or a flyback converter. From this diagram, the designer CAN extract phase and gain data within the frequency range of interest. His job then consists in identifying a compensator structure which will lead to the selected cros


Sp6691 Remote Control 100khz Infrared Led Driver
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sover frequency affected by the right phase margin. The final step requires the study of the total loop gain, the power plant followed by the compensator, showing that the poles/zeros placed on the compensator ensure stability once the loop is closed. If this operation is rather straightforward with single loops, the operation becomes more complicated with converters implementing weighted feedback. This paper capitalizes on the Ref. [1] work and explores different ways to apply the technique to power converters featuring multiple feedback paths. The TL431 a Multiple Loop System The TL431 alone, CAN be modeled as a multiple loop feedback system. Figure 1 shows a TL431 classically wired in a type-2 configuration, as described in Ref. [2]. From this schematic, one CAN identify so-called slow and fast lanes. Figure 20. Schematic of the Two-switch Forward Power Supply featuring a Weighted Feedback with TL431




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