R311H151C 데이터 시트보기 (PDF) - RICOH Co.,Ltd.
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R311H151C Datasheet PDF : 20 Pages
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s OPERATION
Ra
Rb
Vref
Rc
Comparator
Figure 1. Block Diagram
VDD
Pch
OUT
Nch
GND
Released Voltage(+VDET)
Supply Voltage Detector Threshold(-VDET)
(VDD)
Minimum Operating Voltage
GND
Output Voltage
(VOUT)
GND
12
3
45
B
Detector Threshold
Hysteresis
A
Step
Comparator
Pin Input Voltage
1
2
3
4
5
I
II
III IV
V
Comparator Output H
L
Inde-
finite
L
H
Tr.1
OFF
ON
Inde-
finite
ON
OFF
Pch
Output Tr.
Nch
ON
OFF
Inde-
finite
OFF
ON
OFF
ON
Inde-
finite
ON
OFF
I.
Rb + Rc
VDD
Ra + Rb + Rc
II.
Rb
VDD
Ra + Rb
tPLH
Figure 2. Operation Diagram
Step 1. Output Voltage is equal to 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 reverse, and
output voltage becomes to GND level. The voltage level of Point A means detector threshold voltage, or
(-VDET).
Step 3. When the supply voltage is less than minimum operating voltage, the operation of output transistor becomes
indefinite, and in the case that output is pulled up to VDD, Output voltage equals to VDD voltage.
Step 4. Output Voltage equals to GND level.
Step 5. At Point “B”, Vref≤VDD×Rb/(Ra+Rb) is true, Output of the comparator is reverse, and output voltage is equal to
the supply voltage, or (VDD). The voltage level of Point B means released voltage, or (+VDET).
* The difference between Released Voltage and Detector Threshold Voltage is Detector Threshold Hysteresis.
Rev.1.10
- 10 -
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