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AN2859 数据表(PDF) 27 Page - STMicroelectronics |
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AN2859 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 29 page ![]() DocID15255 Rev 2 27/29 AN2859 Resistor settings 29 C.3 Third case: V2_Max < V3_Min Equations 32 and 36 define respectively V2_Max and V3_Min (see Appendix A). To take into account R3 resistor’s standardized values, the resistors’ tolerance (XR), the STCC08 AVF output electrical dispersion and the DC power supply characteristic, the condition on R2 and R4 resistors is defined in Equation 49. Equation 47 Equation 48 Equation 49 3_Min 2_Max V V < CC_Min R_Min 4 3 2 R_Max 4 3 AVF_L_Max R_Max 2 CC_Max V X · R R R X · R R · V X · R · V < ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + 3 AVF_L_Max R_Max R_Min CC_Min R_Max R_Min CC_Min CC_Max 2 4 R V X X · V X X · V V · R R − − ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ − > |
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