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参数资料
| 型号： | R3111Q251A |
| 厂商： | Ricoh Co., Ltd. |
| 英文描述： | LOW VOLTAGE DETECTOR |
| 中文描述： | 低电压检测 |
| 文件页数： | 2/20页 |
| 文件大小： | 218K |
| 代理商： | R3111Q251A |
Rev.1.10
- 10 -
s OPERATION
VDD
OUT
GND
Vref
Ra
Rb
Rc
Pch
Nch
Comparator
Figure 1. Block Diagram
tPLH
Supply Voltage
(VDD)
Output Voltage
(VOUT)
Released Voltage(+VDET)
Detector Threshold(-VDET)
Detector Threshold
Hysteresis
12
3
4
5
A
B
Minimum Operating Voltage
GND
Step
1
234
5
Comparator
Pin Input Voltage
I
II
III
IV
V
Comparator Output
H
L
Inde-
finite
LH
Tr.1
OFF
ON
Inde-
finite
ON
OFF
Pch
ON
OFF
Inde-
finite
OFF
ON
Output Tr.
Nch
OFF
ON
Inde-
finite
ON
OFF
I.
Rc
Rb
Ra
Rc
Rb
+
VDD
II.
Rb
Ra
Rb
+
VDD
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.
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