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LM2991J Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2991J Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 11 page Typical Performance Characteristics (Continued) Application Hints EXTERNAL CAPACITORS The LM2991 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 Ω, or the zero added to the regu- lator frequency response by the ESR could reduce the phase margin, creating oscillations. The shaded area in the Output Capacitor ESR graph indicates the recommended ESR range. 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 inches from the input power supply filter. MINIMUM LOAD A minimum load current of 500 µA is required for proper op- eration. The external resistor divider can provide the mini- mum load, with the resistor from the adjust pin to ground set to 2.4 k Ω. SETTING THE OUTPUT VOLTAGE The output voltage of the LM2991 is set externally by a resis- tor divider using the following equation: V OUT = VREF x(1+R2/R1)−(IADJ xR2) where V REF = −1.21V. The output voltage can be pro- grammed within the range of −3V to −24V, typically an even Adjust Pin Current DS011260-25 Low Voltage Behavior DS011260-26 Maximum Power Dissipation (TO-220) DS011260-27 Maximum Power Dissipation (TO-263) (See Note 3) DS011260-28 Output Capacitor ESR Range DS011260-5 www.national.com 5 |
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