R5VL20C View Datasheet(PDF) - RICOH Co.,Ltd.
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R5VL20C Datasheet PDF : 29 Pages
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R ×5VL
OPERATION
Ra
+
–
Rb
Tr.1
Rc
FIG. 1 Block Diagram
VDD
Pch
OUT
Nch
GND
· In R×5VL××A, Nch Tr. drain is con-
nected to OUT pin.
· In R×5VL××C, Nch Tr. drain and
Pch Tr. drain are connected to
OUT pin.
Operation Diagram
12
3
45
Supply Volage
(VDD)
Released Volage +VDET
Detected Volage –VDET
Minimum Operating Volage
GND
B
A Detector Threshold Hysteresis
Output Volage
(OUT)
GND
tPLH
FIG. 2 Operation Diagram
Step
Step 1 Step 2 Step 3 Step 4 Step 5
Comparator(+)Pin
Input Voltage
I II
II
II I
Comparator Output H L Indefinite L H
Tr. 1
OFF ON Indefinite ON OFF
Pch ON OFF Indefinite OFF ON
Output Tr.
Nch OFF ON Indefinite ON OFF
I.
Rb + Rc ·VDD
Ra + Rb + Rc
II.
Rb ·VDD
Ra + Rb
Step 1. Output Voltage is equal to Power Source Voltage (VDD).
Step 2. When Input Voltage to Comparator reaches the state of Vref ≥ VDD·(Rb+Rc)/(Ra+Rb+Rc)at Point A (Detected Voltage –VDET), the output of Com-
parator is reserved, so that Output Voltage becomes GND.
Step 3. In the case of CMOS Output, Output Voltage becomes unstable when Supply Voltage (VDD) is smaller than Minimum Operating Voltage. In the
case of Nch Open Drain Output, a pulled-up voltage is output.
Step 4. Output Voltage becomes equal to GND.
Step 5. When Input Voltage to Comparator reaches the state of Vref≤VDD·(Rb)/(Ra+Rb) at Point B (Released Voltage +VDET), the output of Comparator is reserved,
so that Output Voltage becomes equal to Supply Voltage (VDD)
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