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參數(shù)資料
| 型號： | R3111E451C-TZ |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | LOW VOLTAGE DETECTOR |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBCY3 |
| 封裝： | TO-92, 3 PIN |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 205K |
| 代理商： | R3111E451C-TZ |
Rev.1.10
- 10 -
I
OPERATION
V
DD
OUT
GND
Vref
Ra
Rb
Rc
Pch
Nch
Comparator
Figure 1. Block Diagram
t
PLH
Supply Voltage
(V
DD
)
Output Voltage
(V
OUT
)
Released Voltage(+V
DET
)
Detector Threshold(-V
DET
)
Detector Threshold
Hysteresis
1
2
3
4
5
A
B
Minimum Operating Voltage
GND
GND
Step
1
2
3
4
5
Comparator
Pin Input Voltage
I
II
III
IV
V
Comparator Output
H
L
Inde-
finite
Inde-
finite
Inde-
finite
Inde-
finite
L
H
Tr.1
OFF
ON
ON
OFF
Pch
ON
OFF
OFF
ON
Output Tr.
Nch
OFF
ON
ON
OFF
I.
Rc
Rb
Ra
Rc
+
Rb
+
Rb
+
+
V
DD
II.
Rb
Ra
V
DD
Figure 2. Operation Diagram
Step 1.
Step 2.
Output Voltage is equal to Supply Voltage (V
DD
).
At Point “A”, Vref
≥
V
DD
×
(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
(-V
DET
).
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 V
DD
, Output voltage equals to V
DD
voltage.
Output Voltage equals to GND level.
At Point “B”, Vref
≤
V
DD
×
Rb/(Ra+Rb) is true, Output of the comparator is reverse, and output voltage is equal to
the supply voltage, or (V
DD
). The voltage level of Point B means released voltage, or (+V
DET
).
* The difference between Released Voltage and Detector Threshold Voltage is Detector Threshold Hysteresis.
Step 3.
Step 4.
Step 5.
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