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參數(shù)資料
| 型號： | R3111E391C-T1-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBCY3 |
| 封裝： | LEAD FREE, TO-92, 3 PIN |
| 文件頁數(shù)： | 6/44頁 |
| 文件大?。?/td> | 1504K |
| 代理商： | R3111E391C-T1-F |
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R3111x
14
OPERATION
Operation of R3111xxxxA
Vref
Ra
Rb
Rc
VDD
OUT
GND
Tr.1
Nch
Comparator
OUT pin should be pulled-up to
VDD or an external voltage level.
Block Diagram (R3111xxxxA)
13
5
A
B
tPLH
2
4
GND
VDDL
-VDET
+VDET
Detector Threshold
Released Voltage
Minimum Operating Voltage
Pull-up Voltage
Detector Threshold
Hysteresis
Supply Voltage
(VDD)
Output Voltage
(VOUT)
Step
1
2
3
4
5
Comparator (
+)
Pin Input Voltage
I
II
I
Comparator Output
H
L
Indefinite
L
H
Tr.1
OFF ON Indefinite ON OFF
Output Tr.
Nch
OFF ON Indefinite ON OFF
I
×VDD
Rb
+Rc
Ra
+Rb+Rc
II
×VDD
Rb
Ra
+Rb
Operation Diagram
Output
Delay Time
Explanation of operation
Step 1. The output voltage is equal to the pull-up voltage.
Step 2. At Point “A”, Vref >
= VDD×(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 (
VDET).
Step 3. When the supply voltage is lower than the minimum operating voltage, the operation of the output
transistor becomes indefinite. The output voltage is equal to the pull-up voltage.
Step 4. The output Voltage is equal to the GND level.
Step 5. At Point “B”, Vref <
= VDD×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 pull-up voltage. The voltage level of Point B means a released
voltage (
+VDET).
) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.
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