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參數(shù)資料
| 型號(hào)： | TLE4261-2 |
| 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 Voltage Regulator |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.5 V DROPOUT, PSFM7 |
| 文件頁(yè)數(shù)： | 2/18頁(yè) |
| 文件大小： | 122K |
| 代理商： | TLE4261-2 |
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TLE 4261
Semiconductor Group
2
1998-11-01
Application Description
The IC regulates an input voltage
V
I
in the range
V
I
= 6 V to 40 V to
V
Qrated
= 5.0 V. A
reset signal is generated for a maximum output voltage of
V
Q
less than 4.75 V. The reset
delay can be set externally with a capacitor. A connected microprocessor is monitored
by the integrated watchdog circuit. Connecting this input to the input voltage makes the
watchdog function inactive. The presence of a voltage less than 2 V on inhibit input
disables the regulator. The current consumption drops to max. 50
μ
A.
Design Notes for External Components
The input capacitor
C
I
causes a low-resistant powerline and limits the rise times of the
input voltage. The IC is protected against rise times up to 100 V/
μ
s. It is possible to damp
the tuned circuit consisting of supply inductance and input capacitance with a resistor of
approx. 1
in series to
C
I
.
The output capacitor maintains the stability of the regulating loop. Stability is guaranteed
with a rating of 22
μ
F at an ESR of 3
max. in the operating temperature range.
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 controls
the base of the series PNP transistor via a buffer. Saturation control as a function of the
load current prevents any over-saturation of the power element. If the output voltage
drops below 95.5 % of its typical value for more than 2
μ
s, a reset signal is triggered on
pin 3 and an external capacitor is discharged on pin 5. The reset signal is not cancelled
until the voltage on the capacitor has exceeded the upper switching threshold
V
DT
. A
positive-edge-triggered watchdog circuit monitors the connected microprocessor and
will likewise trigger a reset if pulses are missing. The IC can be disabled by a low level
on the inhibit input and the current consumption drops to < 50
μ
A.
The IC also incorporates a number of circuits for protection against:
G
Overload
G
Overvoltage
G
Overtemperature
G
Reverse polarity
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TLE4261-2G | 5-V Low-Drop Voltage Regulator |
| TLE4261-2GL | 5-V Low-Drop Voltage Regulator |
| TLE4261G | 5-V Low-Drop Voltage Regulator |
| TLE4261S | 5-V Low-Drop Voltage Regulator |
| TLE4262 | 5-V Low Drop Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TLE4261-2G | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:5-V Low-Drop Voltage Regulator |
| TLE4261-2GL | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:5-V Low-Drop Voltage Regulator |
| TLE4261G | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:5-V Low-Drop Voltage Regulator |
| TLE4261S | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:5-V Low-Drop Voltage Regulator |
| TLE4262 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:5-V Low Drop Voltage Regulator |
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