參數(shù)資料
型號(hào): L4937N
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): 6/9頁
文件大小: 66K
代理商: L4937N
Figure1 :
OutputVoltagevs. InputVoltage.
Figure2 :
QuiescentCurrent vs.SupplyVoltage.
RESETCIRCUIT
Theblockcircuitdiagramoftheresetcircuitisshown
infig.3.Theresetcircuitsupervisesthestandbyout-
put voltage. The reset thresholdof 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
Thereactiontimeof theresetcircuitdependsonthe
discharge time limitation of the reset capacitor C
T
and is proportionalto the valueof C
T
.
The reaction time of the reset circuit increases the
noiseimmunity.In fact,ifthestandbyoutputvoltage
drops below the reset threshold for a time shorter
thanthe reactiontimet
RR
, noreset outputvariation
occurs. The nominal reset delay is generated for
standby output voltage drops longer than the time
necessary for the complete discharging of the ca-
pacitorC
T
. This timeis typicallyequalto 50
μ
s if C
T
= 100nF. The typical reset output waveforms are
shownin fig.
400
200
L4937N
6/9
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