參數(shù)資料
型號(hào)： R3131N30HC8-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(yè)數(shù)： 11/31頁(yè)
文件大小： 247K
代理商： R3131N30HC8-TR-FB
R3130NxxxA/C, R3131NxxxA/C
19
Operation of R3131N Series
VDD
OUT
Pch
Ra
Rb
Nch
GND
Comparator
Vref
-
+
Delay
Circuit
Block Diagram
Minimum Operating
Voltage(VDDL)
Tdelay
GND
B
A
1
2
3
4
5
Supply
Voltage
(VDD)
Output
Voltage
(VOUT)
Detector Threshold(VDET)
=Released Voltage
Operation Diagram
In the above diagram,
x
Output voltage becomes equal to GND level.
y
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).
z
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.)
{
Output voltage is equal to supply voltage. (Nch open drain output type; equal to pull-up voltage.)
|
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.
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.)
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