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參數(shù)資料
| 型號(hào)： | LM2991T |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Negative Low Dropout Adjustable Regulator |
| 中文描述： | 3 V-24 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSFM5 |
| 封裝： | STRAIGHT, TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大?。?/td> | 338K |
| 代理商： | LM2991T |
Application Hints
(Continued)
greater range of 2V to 25V. The adjust pin current is about
60 nA, causing a slight error in the output voltage. However,
using resistors lower than 100 k
makes the adjust pin cur-
rent negligible. For example, neglecting the adjust pin cur-
rent, and setting R2 to 100 k
and V
OUT
to 5V, results in an
output voltage error of only 0.16%.
ON/OFF PIN
The LM2991 regulator can be turned off by applying a TTL or
CMOS level high signal to the ON/OFF pin (see Adjustable
Current Sink Application).
Typical Applications
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2991 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 LM2991 could damage
the device. The LM2991 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.
Fully Isolated Post-Switcher Regulator
DS011260-6
Adjustable Current Sink
DS011260-10
www.national.com
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2991S | Negative Low Dropout Adjustable Regulator |
| LM2991 | Negative Low Dropout Adjustable Regulator |
| LM3-EWN1-01-N2 | SMD LED |
| LM3-PBG1-01-N1 | SMD LED |
| LM3-PBL1-01-N1 | SMD LED |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2991T | 制造商:Texas Instruments 功能描述:V REG ADJ -2/25V 2991 TO-220-5 |
| LM2991T/LB01 | 制造商:Texas Instruments 功能描述:LDO Regulator Neg -3V to -24V 1A 5-Pin(5+Tab) TO-220 Rail |
| LM2991T/LB02 | 制造商:Texas Instruments 功能描述:LDO Regulator Neg -3V to -24V 1A 5-Pin(5+Tab) TO-220 Rail |
| LM2991T/LB03 | 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(dòng)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 |
| LM2991T/LF03 | 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(dòng)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 |
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