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參數(shù)資料
| 型號(hào)： | TLE4271 |
| 廠商： | SIEMENS A G |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 5-V Low-Drop Fixed Voltage Regulator |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSFM7 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大?。?/td> | 178K |
| 代理商： | TLE4271 |
TLE 4271-2
Data Sheet Rev. 2.4
3
2001-04-04
Circuit Description
The control amplifier compares a reference voltage, which is kept highly accurate by
resistance adjustment, to a voltage that is proportional to the output voltage and drives
the base of a series transistor via a buffer. Saturation control as a function of the load
current prevents any over-saturation of the power element.
The reset output RO is in high-state if the voltage on the delay capacitor
C
D
is greater or
equal
V
UD
. The delay capacitor
C
D
is charged with the current
I
D
for output voltages
greater than the reset threshold
V
RT
. If the output voltage gets lower than
V
RT
(
’
reset
condition
’
) a fast discharge of the delay capacitor
C
D
sets in and as soon as
V
D
gets lower
than
V
LD
the reset output RO is set to low-level.
The time for the delay capacitor charge from
V
UD
to
V
LD
is the reset delay time
t
D
.
When the voltage on the delay capacitor has reached
V
UD
and reset was set to high, the
watchdog circuit is enabled and discharges
C
D
with the constant current
I
DWD
. If there is
no rising edge observed at the watchdog input,
C
D
will be discharge down to
V
LDW
, then
reset output RO will be set to low and
C
D
will be charged again with the current
I
DWC
until
V
D
reaches
V
UD
and reset will be set high again.
If the watchdog pulse (rising edge at watchdog input WI) occurs during the discharge
period
C
D
is charged again and the reset output stays high. After
V
D
has reached
V
UD
,
the periodical behavior starts again.
Internal protection circuits protect the IC against:
Overload
Overvoltage
Overtemperature
Reverse polarity
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