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参数资料
| 型号： | R3111Q341C-TR-FA |
| 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： | 3/22页 |
| 文件大小： | 195K |
| 代理商： | R3111Q341C-TR-FA |
R3111x
11
tPLH
Supply Voltage
(VDD)
Output Voltage
(VOUT)
Released Voltage(+VDET)
Detector Threshold(-VDET)
Detector Threshold
Hysteresis
12
3
4
5
A
B
Minimum Operating Voltage
GND
Step
1
2
3
4
5
Comparator
Pin Input Voltage
I
II
III
IV
V
Comparator
Output
H
L
Inde-finite
L
H
Tr.1
OFF
ON
Inde-finite
ON
OFF
Pch
ON
OFF Inde-finite OFF
ON
Output
Tr.
Nch
OFF
ON
Inde-finite
ON
OFF
Rb
+ Rc
I.
Ra
+ Rb + Rc
× VDD
Rb
II.
Ra
+ Rb
× VDD
Figure 2. Operation Diagram
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 reverse,
and output voltage becomes to GND level. The voltage level of Point A means detector threshold voltage,
or (
VDET).
Step 3. When the supply voltage is less than minimum operating voltage, the operation of output transistor
becomes indefinite, and in the case that output is pulled up to VDD, the output voltage equals to VDD
voltage.
Step 4. The output voltage equals to GND level.
Step 5. At Point “B”, Vref >
= VDD×Rb/(Ra+Rb) is true, Output of the comparator is reverse, and output voltage is
equal to the supply voltage, or (VDD). The voltage level of Point B means released voltage, or (
+VDET).
The difference between released voltage and detector threshold voltage is the detector threshold hysteresis.
Vref
VDD
GND
OUT
+
-
Ra
Rb
Rc
Comparator
Nch
OUT pin should be pulled up
to VDD or another voltage
source.
Figure 3. Block Diagram (R3111XXXXB)
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