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參數(shù)資料
| 型號： | SPX2967 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 400mA Low Dropout Voltage Regulator |
| 中文描述： | 400mA的低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 98K |
| 代理商： | SPX2967 |
2
Date: 8/23/04 SPX2967 400mA Low Dropout Voltage Regulator
Copyright 2004 Sipex Corporation
APPLICATIONS INFORMATION
The IC regulates an input voltage V
in the range of 5.5 V < V
<40 V to a nominal output voltage
of V
= 5.0V. A reset signal is generated for an output voltage of V
< V
(typ. 4.5V). The reset
delay can be set with an external capacitor. The device has two logic inputs. A voltage of V
>4.0V
given to the E2-pin (e.g. by ignition) turns the device on. Depending on the voltage on pin E6 the
IC may be hold in active-state even if V
goes down to low level. This makes it simple to
implement a self-holding circuit without external components. When the device is turned off, the
output voltage drops to 0V and current consumption tends towards 0
μ
A.
DESIGN NOTES FOR EXTERNAL COMPONENTS
The input capacitor C
is necessary for compensation of line influences. The resonant circuit
consisting of lead inductance and input capacitance can be damped by a resistor of approxi-
mately 1
in series with C
. The output capacitor is necessary for the stability of the regulating
circuit. Stability is guaranteed at values of
≥
22
μ
F and an ESR of less than 3
within the operating
temperature range.
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 the series
transistor via a buffer. Saturation control as a function of the load current prevents and over-
saturation of the power element.
The reset output RO is in high state if the voltage on the delay capacitor C
greater than or equal
to V
The delay capacitance C
is charged with the current I
for output voltages greater than
the reset threshold V
If the output voltage gets lower than V
a fast discharge of the delay
capacitor C
sets in and as soon as V
gets lower than V
the reset output RO is set to low-level.
The reset delay can be set within wide range by dimensioning the capacitance of the external
capacitor.
CIRCUIT DESCRIPTION
PIN DESCRIPTION
N
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B
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| SPX2967T | 400mA Low Dropout Voltage Regulator |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SPX2967T | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:400mA Low Dropout Voltage Regulator |
| SPX2967U | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:400mA Low Dropout Voltage Regulator |
| SPX2969 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
| SPX2969S | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
| SPX2969S/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
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