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參數(shù)資料
| 型號： | NCV4949 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 100 mA, 5.0 V, Low Dropout Voltage Regulator with Power-On Reset(100 mA, 5.0 V, 具有上電復位功能的低壓差穩(wěn)壓器) |
| 中文描述： | 一○○毫安，5.0 V固定，低壓差線性穩(wěn)壓器的上電復位（100毫安，5.0五，具有上電復位功能的低壓差穩(wěn)壓器） |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 116K |
| 代理商： | NCV4949 |
L4949, NCV4949
http://onsemi.com
8
Reset Circuit
The block circuit diagram of the reset circuit is shown in
Figure 16.
The reset circuit supervises the output voltage. The reset
threshold of 4.5 V is defined with the internal reference
voltage and standby output divider.
The reset pulse delay time t
RD
, is defined with the charge
time of an external capacitor C
T
:
CTx 2.0 V
tRD
2.0 A
The reaction time of the reset circuit originates from the
discharge time limitation of the reset capacitor C
T
and is
proportional to the value of C
T
. The reaction time of the reset
circuit increases the noise immunity.
1.23 V V
ref
22 k
Out
Reg
2.0 A
C
T
2.0 V
+
Reset
Figure 16. Reset Circuit
Standby output voltage drops below the reset threshold
only a bit longer than the reaction time results in a shorter
reset delay time.
The nominal reset delay time will be generated for
standby output voltage drops longer than approximately
50
s. The typical reset output waveforms are shown in
Figure 17.
VRT + 0.1 V
5.0 V
UKT
V
out
3.0 V
Reset
V
out1
V
in
40 V
t
t
R
t
RD
t
RD
t
RR
Switch On
Input Drop
Dump
Output
Overload
Switch Off
Figure 17. Typical Reset Output Waveforms
Sense Comparator
The sense comparator compares an input signal with an
internal voltage reference of typical 1.23 V. The use of an
external voltage divider makes this comparator very flexible
in the application.
It can be used to supervise the input voltage either before
or after the protection diode and to give additional
information to the microprocessor like low voltage warnings.
ORDERING INFORMATION
Device
Operating Temperature Range
Package
Shipping
L4949N
T
J
= 40
°
C to +125
°
C
PDIP8
50 Units / Rail
L4949NG
PDIP8
(PbFree)
50 Units / Rail
L4949D
SOIC8
98 Units / Rail
L4949DG
SOIC8
(PbFree)
98 Units / Rail
L4949DR2
SOIC8
2500 Units / Tape & Reel
L4949DR2G
SOIC8
(PbFree)
2500 Units / Tape & Reel
NCV4949DG*
SOIC8
(PbFree)
98 Units / Rail
NCV4949DR2*
SOIC8
2500 Units / Tape & Reel
NCV4949DR2G*
SOIC8
(PbFree)
2500 Units / Tape & Reel
NCV4949DWR2*
SOIC20W
1000 Units / Tape & Reel
NCV4949DWR2G*
SOIC20W
(PbFree)
1000 Units / Tape & Reel
For information on tape and reel specifications,including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NCV4949: T
= 40
°
C, T
= +125
°
C. Guaranteed by design.
NCV prefix is for automotive and other applications requiring site and change control.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4949A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:100 mA, 5.0 V, Low Dropout Voltage Regulator with Reset and Sense |
| NCV4949ADR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 100 MA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4949ADWR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 100 MA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4949APDR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 100 MA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4949DG | 功能描述:低壓差穩(wěn)壓器 - LDO ANA OSPI MULTIFNCTN RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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