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R3111H451A-TR Datasheet(PDF) 10 Page - RICOH electronics devices division |
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R3111H451A-TR Datasheet(HTML) 10 Page - RICOH electronics devices division |
10 / 20 page Rev.1.10 - 10 - s 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 1 234 5 Comparator Pin Input Voltage I II III IV V Comparator Output H L Inde- finite LH Tr.1 OFF ON Inde- finite ON OFF Pch ON OFF Inde- finite OFF ON Output Tr. Nch OFF ON Inde- finite ON OFF I. Rc Rb Ra Rc Rb + + + VDD II. Rb Ra Rb + VDD Figure 2. Operation Diagram Step 1. Output Voltage is equal to 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, Output voltage equals to VDD voltage. Step 4. 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 Detector Threshold Hysteresis. |
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