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A6986F データシート(PDF) 39 Page - STMicroelectronics |
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A6986F データシート(HTML) 39 Page - STMicroelectronics |
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39 / 72 page ![]() DocID027739 Rev 1 39/72 A6986F Closing the loop 72 6.2 Error amplifier compensation network The typical compensation network required to stabilize the system is shown in Figure 30. Figure 30. Transconductance embedded error amplifier RC and CC introduce a pole and a zero in the open loop gain. CP does not significantly affect system stability but it is useful to reduce the noise at the output of the error amplifier. The transfer function of the error amplifier and its compensation network is: Equation 24 Where Avo = Gm · Ro The poles of this transfer function are (if Cc >> C0 + CP): Equation 25 A0 s AV0 1s Rc Cc + s 2 R0 C0 Cp + Rc Cc sR0 Cc R0 C0 Cp + + Rc Cc + 1 + + --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- = fPLF 1 2 R 0 Cc ------------------------------------- = |
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