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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP651-E/MF датащи(PDF) 27 Page - Microchip Technology |
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MCP651-E/MF датащи(HTML) 27 Page - Microchip Technology |
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27 / 44 page  © 2009 Microchip Technology Inc. DS22146A-page 27 MCP651/2/5 4.7.3 H-BRIDGE DRIVER Figure 4-15 shows the MCP652 dual op amp used as a H-bridge driver. The load could be a speaker or a DC motor. FIGURE 4-15: H-Bridge Driver. This circuit automatically makes the noise gains (GN) equal, when the gains are set properly, so that the fre- quency responses match well (in magnitude and in phase). Equation 4-11 shows how to calculate RGT and RGB so that both op amps have the same DC gains; GDM needs to be selected first. EQUATION 4-11: Equation 4-12 gives the resulting common mode and differential mode output voltages. EQUATION 4-12: RF ½ MCP652 RF VIN VOT RF ½ MCP652 RGB VOB VDD/2 RGT RL GDM VOT VOB – VIN VDD 2 ⁄ – -------------------------------- 2 V/V ≥ ≡ RGT RF GDM 2 ⁄ () 1 – --------------------------------- = RGB RF GDM 2 ⁄ ------------------- = VOT V + OB 2 --------------------------- VDD 2 ----------- = VOT V – OB GDM VIN VDD 2 ----------- – ⎝⎠ ⎛⎞ = |
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