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LM2991J-QML 数据表(PDF) 9 Page - National Semiconductor (TI) |
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LM2991J-QML 数据表(HTML) 9 Page - National Semiconductor (TI) |
9 / 13 page 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 |
类似零件编号 - LM2991J-QML |
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类似说明 - LM2991J-QML |
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