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AN2859 Datasheet(PDF) 26 Page - STMicroelectronics |
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AN2859 Datasheet(HTML) 26 Page - STMicroelectronics |
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26 / 29 page  Resistor settings AN2859 26/29 DocID15255 Rev 2 C.2 Second case: V2_Min > V1_Max Equations 29 and 33 define respectively V1_Max and V2_Min (see Appendix A). To take into account R3 resistor’s standardized values, the resistor’s tolerance (XR), the STCC08 AVF output electrical dispersion and the DC power supply characteristic, the condition on R2 and R4 resistors is defined by Equation 46. Equation 43 Equation 44 Equation 45 Equation 46 1_Max 2_Min V V > R_Max 4 3 2 R_Min 4 AVF_L_Min R_Min 2 CC_Min 2_Min X · R R R ·X R R · V X · R · V V ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + = R_Min 4 2 1 R_Max 2 1 AVF_L_Max R_Max 4 CC_Max 1_Max X · R R R X · R R · V X · R · V V ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + = AVF_L_Min 2 R_Min R_Max CC_Max AVF_L_Min 2 R_Min R_Max AVF_L_Max 3 2 R_Min R_Max AVF_L_Max CC_Min 2 4 V X X · V V X X · V · R X X V V · R R − ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ − ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ − ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ − < |
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