R3111Q601B-TR-F Ver la hoja de datos (PDF) - RICOH Co.,Ltd.
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R3111Q601B-TR-F Datasheet PDF : 44 Pages
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R3111x
OPERATION
• Operation of R3111xxxxA
Ra
Rb
Vref
Rc
Comparator
VDD
OUT pin should be pulled-up to
OUT VDD or an external voltage level.
Nch
Tr.1
GND
Block Diagram (R3111xxxxA)
1
23
4
5
Released Voltage +VDET
A
Detector Threshold -VDET
Supply Voltage
(VDD)
Minimum Operating Voltage VDDL
GND
Detector Threshold B
Hysteresis
Step
12
3
45
Comparator (+)
Pin Input Voltage
I II
II
II I
Comparator Output H L Indefinite L H
Tr.1
OFF ON Indefinite ON OFF
Output Tr. Nch OFF ON Indefinite ON OFF
Pull-up Voltage
Output Voltage
(VOUT)
GND
Output
Delay Time
tPLH
I
Rb+Rc
Ra+Rb+Rc
×VDD
II
Rb
Ra+Rb
×VDD
Operation Diagram
• Explanation of operation
Step 1. The output voltage is equal to the pull-up voltage.
Step 2. At Point “A”, Vref >= VDD×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reversed
from "H" to "L", therefore the output voltage becomes the GND level. The voltage level of Point A means
a detector threshold voltage (−VDET).
Step 3. When the supply voltage is lower than the minimum operating voltage, the operation of the output
transistor becomes indefinite. The output voltage is equal to the pull-up voltage.
Step 4. The output Voltage is equal to the GND level.
Step 5. At Point “B”, Vref <= VDD×Rb/(Ra+Rb) is true, as a result, the output of comparator is reversed from "L" to
"H", then the output voltage is equal to the pull-up voltage. The voltage level of Point B means a released
voltage (+VDET).
∗) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.
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