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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3011 датащи(PDF) 32 Page - STMicroelectronics |
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AN3011 датащи(HTML) 32 Page - STMicroelectronics |
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32 / 37 page  Efficiency AN3011 32/37 Doc ID 16043 Rev 1 Figure 36. Brown-out protection, internal block diagram The current hysteresis provides an additional degree of freedom. It is possible to set the ON threshold and the OFF threshold for the flyback input voltage separately by properly choosing the external divider resistors. The following relationships can be established for the ON (VIN_ON) and OFF (VIN_OFF) thresholds of the input voltage: Equation 2 Equation 3 Where IBRhyst=10 µA (typ.) is the current hysteresis, VBRhyst=50 mV (typ.) is the voltage hysteresis and VBRth=450 mV (typ.) is the brown-out comparator internal reference. One purpose of this protection is to stop operation of the converter when the line voltage is too low, avoiding too high root mean square current value flowing inside the main switch an then its overheating. Another purpose is to avoid a false restart of the converter and then Figure 34. J7 jumper setting. Brown-out disabled Figure 35. J7 jumper setting. Brown-out enabled ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ⋅ = L L H BRth OFF _ IN R R R V V () BRhyst H L L H BRhyst BRth ON _ IN I R R R R V V V ⋅ + ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ⋅ + = |
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