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参数资料
| 型号： | R3116Q121A-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： | 3/25页 |
| 文件大小： | 441K |
| 代理商： | R3116Q121A-TR-FE |
R3116x
11
Operation of R3116xxx1C
Vref
Ra
Rb
Rc
VDD
OUT
GND
Tr.1
Nch
Comparator
Pch
Delay
Circuit
CD
Block Diagram (R3116xxx1C)
tD
GND
VDDL
-VDET
+VDET
Detector Threshold
Released Voltage
Minimum Operating Voltage
1
2
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
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
Operation Diagram
Explanation of operation
Step 1. The output voltage is equal to the 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 reversed
from "L" to "H", 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.
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 "H" to
"L", then the output voltage is equal to the supply voltage (VDD). 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.
Output
Delay Time
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