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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6566B датащи(PDF) 38 Page - STMicroelectronics |
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L6566B датащи(HTML) 38 Page - STMicroelectronics |
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38 / 51 page  Application information L6566B 38/51 Figure 25. Brownout protection: internal block diagram and timing diagram The brownout comparator is provided with current hysteresis in addition to voltage hysteresis: an internal 15 µA current sink is ON as long as the voltage applied on the AC_OK pin is such that the AC_FAIL signal is high. This approach provides an additional degree of freedom: it is possible to set the ON threshold and the OFF threshold separately by properly choosing the resistors of the external divider (see below). With just voltage hysteresis, instead, fixing one threshold automatically fixes the other one depending on the built-in hysteresis of the comparator. With reference to Figure 25, the following relationships can be established for the ON (VsenON) and OFF (VsenOFF) thresholds of the sensed voltage: Equation 16 which, solved for RH and RL, yield: Equation 17 Sensed voltage Vcc (pin 5) VsenON VsenOFF GD (pin 4) Vout VAC_OK (pin 16) IHYS 15 µA t t t t t t t AC_FAIL 0.45V 0.485V - + L6566B AC_FAIL AC_OK Vcc 16 5 0.485V 0.45V 15 µA RH RL Sensed voltage L H OFF L 6 H ON R 45 . 0 R 45 . 0 Vsen R 485 . 0 10 15 R 485 . 0 Vsen = − + ⋅ = − − 45 . 0 Vsen 45 . 0 R R ; 10 15 Vsen 078 . 1 Vsen R OFF H L 6 OFF ON H − = ⋅ ⋅ − = − |
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