參數(shù)資料
型號(hào)： R3111E591C-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)： 7/44頁
文件大?。?/td> 1504K
代理商： R3111E591C-T1-F
R3111x
15
Operation of R3111xxxxB
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 (R3111xxxxB)
tPLH
GND
VDDL
-VDET
+VDET
Detector Threshold
Released Voltage
Minimum Operating Voltage
Pull-up Voltage
1
2
3
A
B
Detector Threshold
Hysteresis
Supply Voltage
(VDD)
Output Voltage
(VOUT)
Step
1
2
3
Comparator (
+)
Pin Input Voltage
I
II
I
Comparator Output
L
H
L
Tr.1
OFF
ON
OFF
Output Tr.
Nch
ON
OFF
ON
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 GND level.
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 pull-up voltage. The voltage level of Point A
means a detector threshold voltage (
VDET).
Step 3. 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 GND level. 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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