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LM2991J-QML 数据表(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM2991J-QML
功能描述  Negative Low Dropout Adjustable Regulator
Download  13 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM2991J-QML 数据表(HTML) 9 Page - National Semiconductor (TI)

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Application Hints (Continued)
using resistors lower than 100 k
Ω makes the adjust pin
current negligible. For example, neglecting the adjust pin
current, and setting R2 to 100 k
Ω 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).
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
positive 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 diode to ground.
Typical Applications
20158701
VO =VRef (1 + R2/R1)
*Required if the regulator is located further than 6 inches from the power supply filter capacitors.A1µF solid tantalum or a 10 µF aluminum electrolytic
capacitor is recommended.
**Required for stability. Must be at least a 10 µF aluminum electrolytic or a 1 µF solid tantalum to maintain stability. May be increased without bound to maintain
regulation during transients. Locate the capacitor as close as possible to the regulator. The equivalent series resistance (ESR) is critical, and should be less
than 10
Ω over the same operating temperature range as the regulator.
Fully Isolated Post-Switcher Regulator
20158706
www.national.com
9


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