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参数资料
| 型号： | R3112Q491A-TR-FE |
| 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： | HALOGEN AND LEAD FREE, SC-82AB, 4 PIN |
| 文件页数： | 2/22页 |
| 文件大小： | 345K |
| 代理商： | R3112Q491A-TR-FE |
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
tD
GND
VDDL
-VDET
+VDET
Detector Threshold
Released Voltage
Minimum Operating Voltage
12
3
4
5
A
B
Detector Threshold
Hysteresis
Supply Voltage
(VDD)
Output Voltage
(VOUT)
tPHL
Detect
Delay Time
Step
1
2
3
4
5
Comparator (
)
Pin Input Voltage
I
II
I
Comparator Output
L
H
Indefinite
H
L
Tr.1,2
OFF ON Indefinite ON OFF
Pch
ON OFF Indefinite OFF ON
Output Tr.
Nch
OFF ON Indefinite ON OFF
I
×VDD
Rb
+Rc
Ra
+Rb+Rc
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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