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參數(shù)資料
| 型號： | R3111N512C-TR-FB |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | SOT-23, 3 PIN |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 195K |
| 代理商： | R3111N512C-TR-FB |
R3111x
12
Minimum Operating
Voltage (VDDL)
GND
Output Voltage
(VOUT)
Supply
Voltage
(VDD)
Hysteresis Range (VHYS)
Released Voltage (+VDET)
Detector Threshold (-VDET)
A
B
t PLH
GND
?
@
A
Pull-up Voltage
Step
1
2
3
Comparator
Pin Input Voltage
I
II
III
Comparator
Output
H
L
H
Tr.1
OFF
ON
OFF
Output
Tr.
Nch
ON
OFF
ON
Rb
+ Rc
I.
Ra
+ Rb + Rc
× VDD
Rb
II.
Ra
+ Rb
× VDD
Figure 4. 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 Pull-up level. The voltage level of Point A means detector threshold
voltage, or (
VDET).
Step 3. 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
VDD
VDS
OUT
IOUT
GND
IN
R3111X
Series
R3111X
Series
VDD
VDD- VDS
VDS
OUT
IOUT
GND
VIN
Apply to CMOS Output type only
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