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參數(shù)資料
| 型號(hào)： | L4545E |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 92K |
| 代理商： | L4545E |
APPLICATION INFORMATION
Supply Voltage Transient
High supply voltage transients can cause a reset
output signaldisturbation.
For supply voltages greater than 8V the circuit
shows a high immunity of the reset output against
supply transientsof morethan100V/
μ
s.
For supply voltages less than 8V supply tran-
sients of more than 0.4V/
μ
s can cause a reset
signal disturbation.
To improve the transient behaviour for supply
voltages less than 8V a capacitor at pin 3 can be
used.
A capacitor at pin 3 (C3
≤
1
μ
F) reduces also the
output noise.
FUNCTIONAL DESCRIPTION
The L4949E is a monolithic integrated voltage
regulator, based on the STM modular voltage
regulator approch. Several outstanding features
and auxiliary functions are implemented to meet
the requirements of supplying microprocessor
systems in automotiveapplications. Nevertheless,
it is suitable also in other applications where the
present functions are required. The modular ap-
proach of this device allows to get easily also
other featuresand functions when required.
Voltage Regulator
The voltage regulator uses an Isolated Collector
Vertical PNP transistor as a regulating element.
Figure1:
FoldbackCharacteristic of V
O
REG
1.23V
REF
SI
SO
RES
GND
D96AT219
PREREGULATOR 5V
V
S
2
μ
+
RESET
2V
SENSE
V
S
1.23V
V
OUT
V
Z(optional)
V
BAT
CT
V
OUT
APPLICATION CIRCUIT
For stability: C
S
≥
1
μ
F, C
O
≥
4.7
μ
F, ESR < 10
at 10KHz
Recommended for application:C
S
= C
O
= 10
μ
F to 100
μ
F
L4949E
4/10
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| L45-50 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Logic IC |
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| L45-54 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Logic IC |
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