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参数资料
| 型号： | R3131N23EA |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封装： | PLASTIC, SOT-23, 3 PIN |
| 文件页数： | 13/32页 |
| 文件大小： | 273K |
| 代理商： | R3131N23EA |
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R3130N×××A/C, R3131N×××A/C
19
Operation of R3131N Series
VDD
OUT
Pch
Ra
Rb
Nch
GND
Comparator
Vref
-
+
Delay
Circuit
Block Diagram
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.)
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,
!
Output Voltage becomes equal to GND level.
"
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).
#
When Supply Voltage is lower than minimum operating voltage, Output of transistor is indefinite, therefore Out-
put 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.
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相关代理商/技术参数 |
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| R3131N26AA | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Low Voltage Detector with built-in Delay Circuit |
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| R3131N26AA5-TR | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Low Voltage Detector with built-in Delay Circuit |
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