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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4116 датащи(PDF) 25 Page - STMicroelectronics |
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AN4116 датащи(HTML) 25 Page - STMicroelectronics |
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25 / 38 page  AN4116 Feedback loop calculation guidelines Doc ID 023220 Rev 1 25/38 The mathematical expression of the compensator C(f) is: Equation 5 where: Equation 6 Equation 7 Equation 8 are chosen in order to ensure the stability of the overall system. Gm = 2 mA/V (typical) is the VIPER06 transconductance. 7.2 Compensation procedure The first step is to choose the pole and zero of the compensator and the crossing frequency, for instance: – fZc = fp/2 – fPc = fz – fcross = fcross_sel ≤fsw/10 G1(fcross_sel) can be calculated from Equation 2 and, since by definition it is | C(fcross_sel)*G1(fcross_sel)| = 1, C0 can be calculated as follows: Equation 9 () ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛⋅ + ⋅ ⋅ ⋅ ⋅ ⋅ + ⋅ = Δ Δ = fPc j f j f fZc j f H C V I f C COMP OUT 1 2 1 0 pk π RfbH RfbL RfbL Cp Cc Gm Co + ⋅ + − = Cc Rc fZc ⋅ ⋅ ⋅ = π 2 1 Cp Cc Rc Cp Cc fPc ⋅ ⋅ ⋅ ⋅ + = π 2 ) _ ( 1 _ 1 _ 1 _ 2 0 sel fcross G H fZc j sel fcross fPc j sel fcross j sel fcross C COMP ⋅ ⋅ + ⋅ + ⋅ ⋅ ⋅ ⋅ = π |
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