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AN2859 数据表(PDF) 14 Page - STMicroelectronics |
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AN2859 数据表(HTML) 14 Page - STMicroelectronics |
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14 / 29 page  Resistance settings AN2859 14/29 DocID15255 Rev 2 3 Resistance settings Equation 13 shows how to select values for R1 and R3 resistances. IAVF_Max is the maximum current sunk by the STCC08 AVF pin and should be lower than 5 mA. Equation 13 Knowing the R1 and R3 resistor standard values, the tolerance of the resistors, the STCC08 AVF output electrical dispersion and the DC power supply characteristic, R2 and R4 resistances value should be chosen by using equations 14 , 15 , and 16 (see also Appendix C). Equation 14 Equation 15 Equation 16 AVF_Max CC_Max 3 1 I V · 2 R R R ≥ = = ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎧ ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ − ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ − ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + > ⇒ > ⇒ 2 R_Min R_Max AVF_L_Max CC_Min AVF_L_Min 2 R_Min R_Max AVF_L_Max 2 4 0_Max 1_Min X X · V V V X X · V · R R R V V ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎧ − ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ − ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ − ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ − < ⇒ > ⇒ AVF_L_Min 2 R_Min R_Max CC_Max AVF_L_Min 2 R_Min R_Max AVF_L_Max 2 R_Min R_Max AVF_L_Max CC_Min 2 4 1_Max 2_Min V X X · V V X X · V · R X X V V · R R V V ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ ⎪⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎧ − − ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ − > ⇒ > ⇒ R V X X · V X X · V V · R R V V AVF_L_Max R_Max R_Min CC_Min R_Max R_Min CC_Min CC_Max 2 4 2_Max 3_Min |
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