R3111Q601B-TR-F Ver la hoja de datos (PDF) - RICOH Co.,Ltd.
Número de pieza
componentes Descripción
Lista de partido
R3111Q601B-TR-F Datasheet PDF : 44 Pages
| |||
R3111x
• Operation of R3111xxxxC
Ra
Rb
Vref
Rc
Comparator
Tr.1
Block Diagram (R3111xxxxC)
VDD
Pch
OUT
Nch
GND
12 3
45
Released Voltage +VDET
A
Detector Threshold -VDET
Detector Threshold
Hysteresis
B
Supply Voltage
(VDD)
Minimum Operating Voltage VDDL
GND
Step
12
3
45
Comparator (−)
I II
II
II I
Pin Input Voltage
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
Output Voltage
(VOUT)
GND
Output
Delay Time
tPLH
Operation Diagram
I
Rb+Rc
Ra+Rb+Rc
×VDD
II
Rb
Ra+Rb
×VDD
• Explanation of operation
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 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.
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 supply voltage (VDD). 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.
16
Share Link: 