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參數(shù)資料
| 型號： | TLE4279 |
| 廠商： | SIEMENS AG |
| 英文描述： | 5-V Low-Drop Fixed Voltage Regulator |
| 中文描述： | 5 - V低拖放固定穩(wěn)壓器 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 242K |
| 代理商： | TLE4279 |
TLE 4279
Semiconductor Group
5
1998-11-01
Circuit Description
The control amplifier compares a reference voltage, made highly accurate by resistance
balancing, with a voltage proportional to the output voltage and drives 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.
In the reset generator block a comparator compares a reference voltage independent of
the input voltage with the scaled-down output voltage. If the output voltage reaches 4.6 V
the reset delay capacitor is discharged and the reset output is set to low. This low is
guaranteed down to an output voltage of 1 V. As the output voltage increases again,
from 4.6 V onward the reset delay capacitor is charged with constant current. When the
capacitor voltage reaches the upper switching threshold
V
dt
, the reset returns to high. By
choosing the value of this capacitor, the reset delay time can be selected over a wide
range. With the reset threshold input RE it is possible to lower the reset threshold
V
rt
. If
pin RE is connected to pin Q via a voltage divider, for example, the reset condition is
reached when this voltage is decreased below the switching threshold
V
re
of 1.35 V.
Another comparator compares the signal of the pin SI, normally fed by a voltage divider
from the input voltage, with the reference and gives an early warning on the pin SO. It is
also possible to superwise an other voltage e.g. of a second regulator, or to build a
watchdog circuit with few external components.
Application Description
The input capacitor
C
I
is necessary for compensating line influences. Using a resistor of
approx. 1
in series with
C
I
, the oscillating circuit consisting of input inductivity and input
capacitance can be damped. The output capacitor
C
Q
is necessary for the stability of the
regulating circuit. Stability is guaranteed at values
≥
10
μ
F and an ESR
≤
10
within the
operating temperature range. Both reset output and sense output are open collector
outputs and have to be connected to 5 V output via external pull-up resistors
≥
10 k
.
For small tolerances of the reset delay the spread of the capacitance of the delay
capacitor and its temperature coefficient should be noted.
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| TLE42794 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Low Dropout Fixed Voltage Regulator |
| TLE42794E | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) LINEAR VLTGE REG RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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| TLE42794G | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) LINEAR VLTGE REG RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| TLE42794GM | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) LINEAR VLTGE REG RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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