參數(shù)資料
型號: R3111Q241B
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): 15/44頁
文件大?。?/td> 1170K
代理商: R3111Q241B
R3111x
Operation of R3111xxxxB
15
Vref
Ra
Rb
Rc
V
DD
OUT
GND
Tr.1
Nch
Comparator
OUT pin should be pulled-up to
V
DD
or an external voltage level.
Block Diagram (R3111xxxxB)
t
PLH
GND
GND
V
DDL
-
V
DET
+V
DET
Detector Threshold
Supply Voltage
(V
DD
)
Released Voltage
Minimum Operating Voltage
Pull-up Voltage
1
2
3
A
B
Detector Threshold
Hysteresis
Output Voltage
(V
OUT
)
Step
1
2
3
Comparator (
+
)
Pin Input Voltage
I
II
I
Comparator Output
L
H
L
Tr.1
OFF ON
OFF
Output Tr.
Nch
ON OFF
ON
I
×
V
DD
Rb
+
Rc
Ra
+
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 GND level.
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 "L" to "H", therefore the output voltage becomes the pull-up voltage. The voltage level of Point A
means a detector threshold voltage (
V
DET
).
Step 3. At Point “B”, Vref
<
=
V
DD
×
Rb/(Ra
+
Rb) is true, as a result, the output of comparator is reversed from "H" to
"L", then the output voltage is equal to the GND level. 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.
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