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參數(shù)資料
| 型號： | LM2925T |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 223K |
| 代理商： | LM2925T |
Typical Performance Characteristics
(Continued)
Definition of Terms
Dropout Voltage:
The input-output voltage differential at
which the circuit ceases to regulate against further reduction
in input voltage. Measured when the output voltage has
dropped 100 mV from the nominal value obtained at 14V in-
put, dropout voltage is dependent upon load current and
junction temperature.
Input Voltage:
The DC voltage applied to the input terminals
with respect to ground.
Input-Output Differential:
The voltage difference between
the unregulated input voltage and the regulated output volt-
age for which the regulator will operate.
Line Regulation:
The change in output voltage for a change
in the input voltage. The measurement is made under condi-
tions of low dissipation or by using pulse techniques such
that the average chip temperature is not significantly af-
fected.
Load Regulation:
The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability:
Output voltage stability under acceler-
ated life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.
Output Noise Voltage:
The rms AC voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.
Quiescent Current:
The part of the positive input current
that does not contribute to the positive load current. The
regulator ground lead current.
Ripple Rejection:
The ratio of the peak-to-peak input ripple
voltage to the peak-to-peak output ripple voltage.
Temperature Stability of V
:
The percentage change in ou-
put voltage for a thermal variation from room temperature to
either temperature extreme.
Application Hints
EXTERNAL CAPACITORS
The LM2925 output capacitor is required for stability. Without
it, the regulator output will oscillate, sometimes by many
volts. Though the 10 μF shown is the minimum recom-
mended value, actual size and type may vary depending
upon the application load and temperature range. Capacitor
effective series resistance (ESR) also effects the IC stability.
Since ESR varies from one brand to the next, some bench
work may be required to determine the minimum capacitor
value to use in production. Worst-case is usually determined
at the minimum junction and ambient temperature and maxi-
mum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief condi-
tions of negative input transients that might be characteristic
of a particular system.
Quiescent Current
DS005268-19
Quiescent Current
DS005268-17
Load Transient Response
DS005268-18
Peak Output Current
DS005268-20
Maximum Power
Dissipation (TO-220)
DS005268-21
Output Capacitor ESR
DS005268-22
5
www.national.com
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PDF描述 |
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| LM2926T | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2927T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel 制造商:Texas Instruments 功能描述: |
| LM2930-5KC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM2930A | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 0.4A Positive RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2930S-5.0 | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:V REG LDO +5.0V SMD 2930 TO2633 |
| LM2930S-5.0 WAF | 制造商:Texas Instruments 功能描述: |
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