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LM2925T Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM2925T Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 8 page Application Hints (Continued) Capacitors must also be rated at all ambient temperatures expected in the system. Many aluminum type electrolytics will freeze at temperatures less than −30˚C, reducing their effective capacitance to zero. To maintain regulator stability down to −40˚C, capacitors rated at that temperature (such as tantalums) must be used. RESET OUTPUT The range of values for the delay capacitor is limited only by stray capacitances on the lower extreme and capacitance leakage on the other. Thus, delay times from microseconds to seconds are possible. The low charging current, typically 2.0 microamps, allows the use of small, inexpensive disc ca- pacitors for the nominal range of 100 to 500 milliseconds. This is the time required in many microprocessor systems for the clock oscillator to stabilize when initially powered up. The RESET output of the regulator will thus prevent erroneous data and/or timing functions to occur during this part of op- eration. The same delay is incorporated after any other fault condition in the regulator output is corrected. www.national.com 6 |
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