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參數(shù)資料
| 型號(hào)： | NCV4949PDG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器 |
| 英文描述： | 100 mA, 5.0V, LDO w/ Reset, Delay, and Early Warning |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.5 V DROPOUT, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, SOIC-8 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大小： | 182K |
| 代理商： | NCV4949PDG |
L4949, NCV4949
http://onsemi.com
8
Reset Circuit
The block circuit diagram of the reset circuit is shown in
Figure 18.
The reset circuit supervises the output voltage. The reset
threshold of 4.5 V is defined by the internal reference
voltage and standby output divider.
The reset pulse delay time tRD, is defined by the charge
time of an external capacitor CT:
tRD +
CT x2.0 V
2.0 mA
The reaction time of the reset circuit originates from the
discharge time limitation of the reset capacitor CT and is
proportional to the value of CT. The reaction time of the reset
circuit increases the noise immunity.
1.23 V Vref
22 k
Out
Reg
2.0
mA
CT
2.0 V
+
-
Reset
Figure 18. Reset Circuit
Output voltage drops below the reset threshold only
marginally longer than the reaction time results in a shorter
reset delay time.
The nominal reset delay time will be generated for output
voltage drops longer than approximately 50
ms. The typical
reset output waveforms are shown in Figure 19.
VRT + 0.1 V
5.0 V
UKT
Vout
3.0 V
Reset
Vout1
Vin
40 V
t
tR
tRD
tRR
Switch On
Input Drop
Dump
Output
Overload
Switch Off
Figure 19. 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 a protection diode and to provide additional
information to the microprocessor such as low voltage
warnings.
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| NCV4949PDR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 100mA 5V LDO VO 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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| NCV494BDR2G | 功能描述:電壓模式 PWM 控制器 Switchmode PWM RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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