參數(shù)資料
型號(hào)： R3111E391C-T1-F
廠商： RICOH COMPANY LTD
元件分類(lèi)： 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(yè)數(shù)： 8/44頁(yè)
文件大?。?/td> 1504K
代理商： R3111E391C-T1-F
R3111x
16
Operation of R3111xxxxC
Vref
Ra
Rb
Rc
VDD
OUT
GND
Tr.1
Nch
Pch
Comparator
Block Diagram (R3111xxxxC)
tPLH
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)
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
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
Output
Delay Time
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 "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.
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 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.
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