參數(shù)資料
型號： R3111Q201A
廠商： Ricoh Co., Ltd.
英文描述： LOW VOLTAGE DETECTOR
中文描述： 低電壓檢測
文件頁數(shù)： 16/44頁
文件大?。?/td> 1170K
代理商： R3111Q201A
R3111x
Operation of R3111xxxxC
16
Vref
Ra
Rb
Rc
V
DD
OUT
GND
Tr.1
Nch
Pch
Comparator
Block Diagram (R3111xxxxC)
t
PLH
GND
GND
V
DDL
-
V
DET
+V
DET
Detector Threshold
Supply Voltage
(V
DD
)
Released Voltage
Minimum Operating Voltage
1
2
3
4
5
A
B
Detector Threshold
Hysteresis
Output Voltage
(V
OUT
)
Step
1
2
3
4
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
×
V
DD
Ra
+
Rb
+
Rc
I
Rb
+
Rc
II
×
V
DD
Rb
Ra
+
Rb
Operation Diagram
Explanation of operation
Output
Delay Time
Step 1. The output voltage is equal to the supply voltage (V
DD
).
Step 2. At Point “A”, Vref
>
=
V
DD
×
(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 (
V
DET
).
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
<
=
V
DD
×
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 (V
DD
). The voltage level of Point B means a
released voltage (
+
V
DET
).
) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.
相關(guān)PDF資料
PDF描述
R3111Q201B LOW VOLTAGE DETECTOR
R3111Q201C LOW VOLTAGE DETECTOR
R3111Q211A LOW VOLTAGE DETECTOR
R3111Q211B LOW VOLTAGE DETECTOR
R3111Q211C LOW VOLTAGE DETECTOR
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