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參數(shù)資料
| 型號(hào)： | L4918 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | VOLTAGE REGULATORS PLUS FILTER |
| 中文描述： | 電壓穩(wěn)壓器和過(guò)濾器 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大小： | 84K |
| 代理商： | L4918 |
teristic. The ripple rejection is externallyadjustable
acting on C
FT
asfollows:
V
I
(jw)
SVR(jw) =
=
V
out
(jw)
10
–6
1 +
gm
jwC
FT
R1
R
2
(1 +
)
Where:
gm = 2 . 10
-5
-1
= OTA’S typicaltransconductance
valueon linear region
R1
= fixed ratio
R2
C
FT
= valueof capacitorin
μ
F
The reaction time of the supervisor loop is given by
thetransconductanceoftheOTAandbyC
FT
. When
thevalueoftheripplevoltageissohighanditsnega-
tive peakis fast/enoughto determine an istantane-
ousdecreaseof thedropouttill 1.2V,theOTAworks
in ahighertransconductancecondition[range(3) of
the characteristic]and discharge the capacitorrapi-
dously.
If theripple frequencyis high enoughthe capacitor
won’t charge itself completely, and the output vol-
tage reaches a smallvalue allowing a betterripple
rejection;the device’s againworking as a filter (fast
transientrange).
WithC
FT
=10
μ
F;f=100HzaSVRof35isobtained.
Figure 2 :
Nonliner Transfer Characteristicof the
DropControl Unit.
Figure 3 :
SupplyVoltageRejection vs. Fre-
1) Normal operating range (high ripple rejection)
2) Drop controlled range (medium ripple rejection)
3) Fast discharge of C
FT
Figure 4
: Supply voltageRejection vs. Input Volt-
age.
Figure 5
: Output Voltagevs. InputVoltage.
L4918
4/6
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