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參數(shù)資料
| 型號(hào)： | L4938NPD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
| 中文描述： | 多功能雙電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 93K |
| 代理商： | L4938NPD |
RESETCIRCUIT
Theblockcircuitdiagramoftheresetcircuitisshown
infig.4.Theresetcircuitsupervisesthestandbyout-
put voltage. The reset threshold of 4.7V is defined
by the internal reference voltage and the standby
outputdivider.
The reset pulse delay time t
RD
, is defined by the
chargetime of an externalcapacitorC
T
:
C
T
x 2V
t
RD
=
2
μ
A
Thereactiontimeoftheresetcircuitdependsonthe
discharge time limitation of the reset capacitor C
T
andis proportionalto thevalue of C
T
.
The reaction time of the reset circuit increasesthe
noiseimmunity.In fact,if thestandbyoutputvoltage
drops below the reset threshold for a time shorter
thanthe reactiontime t
RR
, no resetoutputvariation
occurs. The nominal reset delay is generated for
standbyoutput voltage drops longer than the time
necessary for the complete discharging of the ca-
pacitorC
T
. This time is typically equal to 50
μ
s if
C
T
= 100nF.Thetypicalresetoutputwaveformsare
shownin fig.5.
SENSECOMPARATOR
Thiscircuitcomparesaninputsignalwithan internal
voltagereference of typically 1.23V.The use of an
externalvoltagedividermakesthecomparatorvery
flexibleintheapplication.Thisfunctioncanbe used
to supervisetheinputvoltage- eitherbeforeorafter
theprotectiondiode- andtogiveadditionalinforma-
tiontothemicroprocessorsuchaslowvoltagewarn-
ings.
If this feature is not used SI and SO have to con-
nectedtoGND.In thiscasetheSt-byquiescentcur-
rent(14V) increases from290
μ
A to 300
μ
A.
Figure 4:
Block Diagram of the Reset Circuit.
L4938N - L4938ND - L4938NPD
7/12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L4938N | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
| L4938ND | DUAL MULTIFUNCTION VOLTAGE REGULATOR |
| L4940V10 | VERY LOW DROP 1.5 A REGULATORS |
| L4940V12 | VERY LOW DROP 1.5 A REGULATORS |
| L4940 | VERY LOW DROP 1.5 A REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4938NPD013TR | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 5V Very 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(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 |
| L493EC | 功能描述:標(biāo)準(zhǔn)LED-通孔 RED WATER CLEAR RoHS:否 制造商:Vishay Semiconductors 照明顏色:Red 光強(qiáng)度:0.7 mcd 波長(zhǎng)/色溫:615 nm 顯示角:45 deg 透鏡顏色/類型:Clear, Non-Diffused 正向電流:70 mA 正向電壓:1.83 V to 3.03 V LED 大小:2 mm 系列: 封裝:Tube |
| L-493EC | 制造商:KINGBRIGHT 制造商全稱:Kingbright Corporation 功能描述:T-1 3/4 (5MM) CYLINDRICAL LED LAMPS |
| L-493ED | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.0x5.0x10.0mm RECTANGULAR LED LAMP |
| L493GC | 制造商:Kingbright Corporation 功能描述:LED Uni-Color Green 565nm 2-Pin T-1 3/4 |
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