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R3113D291X Datasheet(PDF) 10 Page - RICOH electronics devices division |
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R3113D291X Datasheet(HTML) 10 Page - RICOH electronics devices division |
10 / 18 page R3113D 10 OPERATION VDD OUT GND Vref Ra Rb Rc Pch Nch Comparator Figure 1. Block Diagram tPLH Supply Voltage (VDD) Output Voltage (VOUT) Released Voltage(+VDET) Detector Threshold(-VDET) Detector Threshold Hysteresis 12 3 4 5 A B Minimum Operating Voltage GND GND Step 1 2 3 4 5 Comparator Pin Input Voltage I II III IV V Comparator Output H L Inde-finite L H Tr.1 OFF ON Inde-finite ON OFF Pch ON OFF Inde-finite OFF ON Output Tr. Nch OFF ON Inde-finite ON OFF Rb + Rc I. Ra + Rb + Rc × VDD Rb II. Ra + Rb × VDD Figure 2. Operation Diagram Step 1. The output voltage is equal to the supply voltage (VDD). Step 2. At Point “A”, Vref > = VDD×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reverse, and output voltage becomes to GND level. The voltage level of Point A means detector threshold voltage, or ( −VDET). Step 3. When the supply voltage is less than minimum operating voltage, the operation of output transistor becomes indefinite, and in the case that output is pulled up to VDD, the output voltage equals to VDD voltage. Step 4. The output voltage equals to GND level. Step 5. At Point “B”, Vref > = VDD×Rb/(Ra+Rb) is true, Output of the comparator is reverse, and output voltage is equal to the supply voltage, or (VDD). The voltage level of Point B means released voltage, or ( +VDET). ∗ The difference between released voltage and detector threshold voltage is the detector threshold hysteresis. |
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