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LED6000 数据表(PDF) 45 Page - STMicroelectronics |
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LED6000 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 49 page  DocID027777 Rev 2 45/49 LED6000 Application notes - alternative topologies 49 In case Z and LC are lower than the target bandwidth, a type II compensation network is necessary for loop stabilization, following the compensation strategy described in Section 5.3 on page 27. Otherwise, in case a very low bandwidth design is suitable, a simple type I compensation network is required. This approach is feasible if the target bandwidth is ¼ of fLC or lower. Figure 34. Type I compensation network This kind of compensation network just provides one single low frequency pole, given by: Equation 41 Starting from Equation 18 on page 28, the control loop gain module at s = 2 * FBW allows to set fPLF necessary value: Equation 42 A typical choice for RU usually falls in the range from 1 k to 50 k, in order to provide for CF a reasonable value (in the range from 1 nF to 100 nF) and to proper bias the overvoltage protection Zener diode. U F PLF R C f 2 1 1 ) 2 ( 0 , BW PLF IN FF BW I LOOP f f V k G f s G |
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