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参数资料
| 型号： | R3111H531BT1 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PSSO3 |
| 封装： | SOT-89, 3 PIN |
| 文件页数： | 4/22页 |
| 文件大小： | 348K |
| 代理商： | R3111H531BT1 |
R3111x
12
Step
1
2
3
4
5
Comparator
Pin Input Voltage
I
II
III
IV
V
Comparator
Output
H
L
Indefinite
L
H
Tr.1
OFF ON
Indefinite
ON OFF
Output
Tr.
Nch
OFF ON
Indefinite
ON OFF
Rb
+ Rc
I.
Ra
+ Rb + Rc
× VDD
Rb
II.
Ra
+ Rb
× VDD
Figure 4. Operation Diagram
Supposed that OUT pin is pulled-up to VDD,
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 Pull-up 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 the
pulled-up VDD voltage.
Step 4. The output voltage equals to pulled-up VDD 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 GND after tpHL. 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.
TEST CIRCUITS
ISS
VDD
OUT
GND
VIN
R3111X
Series
R3111X
Series
VDD
VOUT
5.0V
OUT
GND
VIN
470k
Pull-up circuit is not necessary for
CMOS Output type, or R3111xxxxC.
Supply Current Test Circuit
Detector Threshold Test Circuit
1
2
3
4
5
Release
(+VDET）
Supply
Voltage
Detector
Threshold
(-V DET )
(VDD)
GND
Output Voltage
(VOUT)
GND
Minimum Operating Voltage
tp LH
ｔｔｔｔPH
PH
PHL
L
Detector Threshold
Hysteresis
A
B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R3111H531C | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:POWER MANAGEMENT ICs MARK INFORMATIONS R3111H SERIES MARK SPECIFICATION |
| R3111H541A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:LOW VOLTAGE DETECTOR |
| R3111H541A-T1 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:LOW VOLTAGE DETECTOR |
| R3111H541A-TR | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:LOW VOLTAGE DETECTOR |
| R3111H541A-TZ | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:LOW VOLTAGE DETECTOR |
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