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参数资料
| 型号： | R3112Q381A-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | SC-82AB, 4-PIN |
| 文件页数： | 2/21页 |
| 文件大小： | 206K |
| 代理商： | R3112Q381A-TR |
R3112x
10
OPERATION
VDD
Pch
Rc
Tr.1
Tr.2
Rb
Ra
Nch
RD
OUT
CD
GND
+
-
Vref
Schmitt Trigger
Comparator
Current Source
Output Capacitor
Fig. 1 Block Diagram with an external capacitor
HYSTERESIS
RANGE
1
GND
Delay Time
A
B
Output Voltage(OUT)
Supply Voltage(VDD)
VDDL
-VDET
+VDET
Minimum Operating
Voltge
Detector Threshold
Released Voltage
23
4
5
Operation Status
Compartor(-) Pin
Input Voltage
Compartor Output
Tr.1, 2
1
I
VDD
L
OFF
Rb+Rc
Ra+Rb+Rc
OFF
ON
Output Tr.
Nch
Pch
2
II
H
ON
OFF
4
II
H
ON
OFF
5
I
L
OFF
ON
3
II
Indefinite
II
VDD
Rb
Ra+Rb
Fig. 2 Operation Diagram
1. Output voltage is equal to supply voltage. (As for Nch open drain type, equal to pull-up voltage.)
2. When the supply voltage is down to the detector threshold voltage level(Point A),
Vref >
= VDD×(Rb+Rc)/(Ra+Rb+Rc) is true, then output of the comparator is reversed from “L” to “H”, therefore
output voltage becomes GND level.
3. When the supply voltage is lower than minimum operating voltage, the operation of output transistor is
indefinite. In the case of Nch open drain type, output voltage is equal to pull-up voltage.
4. Output Voltage becomes GND level.
5. When the supply voltage is higher than released voltage (Point B), Vref <
= VDD×Rb/(Ra+Rb) is true, then
output of the comparator reaches the threshold level, and Output of Shmitt Trigger is reversed from “H” to
“L”, then output voltage is equal to supply voltage. (As for Nch open drain type, equal to pull-up voltage.)
) The difference between released voltage and detector threshold voltage means hysteresis range voltage.
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