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參數(shù)資料
| 型號： | R3131N38EA-TR |
| 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)： | 9/29頁 |
| 文件大?。?/td> | 335K |
| 代理商： | R3131N38EA-TR |
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R3130N/R3131N
17
Operation of R3131N Series
VDD
OUT
Pch
Ra
Rb
Nch
GND
Comparator
Vref
-
+
Delay
Circuit
CMOS output type
OUT pin is connected to the drain of
Nch Tr. and Pch Tr. in this IC.
Nch open drain output type: I
OUT pin is connected to the drain of
Nch Tr. in this IC. (OUT pin should be
pulled up to VDD or an external voltage
level.)
Block Diagram
Minimum Operating
Voltage(VDDL)
Tdelay
GND
B
A
1
2
3
4
5
Supply
Voltage
(VDD)
Output
Voltage
(OUT)
Detector Threshold(VDET)
=Released Voltage
Operation Diagram
In the above diagram,
1
Output voltage becomes equal to GND level.
2
When supply voltage is down to the detector threshold level (Point A), Vref >
= VDD× Rb/(Ra+Rb) is true. Then,
output of the comparator is reversed, thus output voltage becomes equal to supply voltage (Nch open drain
output type; equal to pull-up Voltage).
3
When supply voltage is lower than minimum operating voltage, Output of transistor is indefinite, therefore
output is also indefinite.(Nch open drain output type; Output voltage level is equal to pull-up voltage.)
4
Output voltage is equal to supply voltage. (Nch open drain output type; equal to pull-up voltage.)
5
When supply voltage is higher than released voltage (Point B), Vref <
= VDD× Rb/(Ra+Rb) is true. Then output
of the comparator is reversed, thus output voltage becomes equal to GND level after the output delay time.
There is no hysteresis range between detector threshold and released voltage.
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