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參數(shù)資料
| 型號： | LM2990T-12 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 12 V FIXED NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 421K |
| 代理商： | LM2990T-12 |
Typical Applications
The LM2940 is a positive 1A low dropout regulator; refer to its datasheet for further information.
Application Hints
EXTERNAL CAPACITORS
The LM2990 regulator requires an output capacitor to main-
tain stability. The capacitor must be at least 10 μF aluminum
electrolytic or 1 μF solid tantalum. The output capacitor’s
ESR must be less than 10
, or the zero added to the regu-
lator frequency response by the ESR could reduce the
phase margin, creating oscillations (refer to the graph on the
right).An input capacitor, of at least 1 μF solid tantalum or 10
μF aluminum electrolytic, is also needed if the regulator is
situated more than 6" from the input power supply filter.
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2990 can withstand
positive voltages on its output. If the voltage source pulling
the output positive is DC, the current must be limited to 1.5A.
A current over 1.5A fed back into the LM2990 could damage
the device. The LM2990 output can also withstand fast posi-
tive voltage transients up to 26V, without any current limiting
of the source. However, if the transients have a duration of
over 1 ms, the output should be clamped with a Schottky di-
ode to ground.
Post Regulator for an Isolated Switching Power Supply
DS010801-5
Fixed Current Sink
DS010801-7
Adjustable Current Sink
DS010801-10
Output Capacitor ESR
DS010801-9
www.national.com
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| LM2990T-15 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LM2990T-5.0 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LM2990T-5.2 | 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 |
|---|---|
| LM2990T-12 | 制造商:Texas Instruments 功能描述:IC V REG LDO -12V 2990 TO-220-3 |
| LM2990T-12/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO NEG LDO REG 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2990T15 | 制造商:National Semiconductor 功能描述:LDO Regulator Neg -15V 1.8A 3-Pin(3+Tab) TO-220 Rail |
| LM2990T-15 | 功能描述:低壓差穩(wěn)壓器 - LDO 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2990T-15.0 | 制造商:Texas Instruments 功能描述:IC V REG LDO -15V 2990 TO-220-3 |
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