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ILC6370CP-50 датащи(PDF) 6 Page - Impala Linear Corporation |
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ILC6370CP-50 датащи(HTML) 6 Page - Impala Linear Corporation |
6 / 8 page SOT-89 Step up Switching Regulator with Shutdown Impala Linear Corporation 6 (408) 574-3939 www.impalalinear.com July 1999 ILC6370/1 1.3 For load currents higher than 10mA, use an inductor from 47µH to 100µH. [The 100µH inductor shown in the data sheet is the most typical used for this application.] For load currents of around 5mA, such as pagers, use an indcutor in the range of 100µH to 330µH. 220µH is the most typical value used here. For lighter loads, an inductor of up to 1mH can be used. The use of a larger inductor will increase overall conversion efficiency, due to the reduction in switching currents through the device. For the ILC6371, using an external transistor, the use of a 47µH inductor is recommended based on our experience with the part. Note that these values are recommended for both 50kHz and 100kHz operation. If using the ILC6370 or ILC6371 at 180kHz, the inductor size can be reduced to approximately half of these stated values. The capacitor should, in general, always be tantalum type, as tan- talum has much better ESR and temperature stability than other capacitor types. NEVER use electrolytics or chemical caps, as the C-value changes below 0°C so much as to make the overall design unstable. Different C-values will directly impact the ripple seen on the output at a given load current, due to the direct charge-to-voltage rela- tionship of this element. Different C-Values will also indirectly affect system reliability, as the lifetime of the capacitor can be degraded by constant high current influx and outflux. Running a capacitor near its maximum rated voltage can deteriorate lifetime as well; this is especially true for tantalum caps which are particu- larly sensitive to overvoltage conditions. In general, this capacitor should always be 47µF, Tantalum, 16V rating. The diode must be of shottkey type for fast recovery and minimal loss. A diode rated at greater than 200mA and maximum voltage greater than 30V is recommended for the fastest switching time and best reliability over time. Different diodes may introduce dif- ferent level of high frequency switching noise into the output waveform, so trying out several sources may make the most sense for your system. For the ILC6371, much of the component selection is as described above, with the addition of the external NPN transistor and the base drive network. The transistor needs to be of NPN type, and shoud be rated for currents of 2A or more. [This translates to lower effective on resistance and, therefore, higher overall effi- ciencies.] The base components should remain at 1k Ω and 3300k Ω; any changes need to be verified prior to implementation. As for actual physical component layout, in general, the more compact the layout is, the better the overall performance will be. It is important to remember that everything in the circuit depends on a common and solid ground reference. Ground bounce can direct- ly affect the output regulation and presents difficult behavior to predict. Keeping all ground traces wide will elliminate ground bounce problems. It is also critical that the ground pin of CL and VSS pin of the device be the same pin on the board, as this capacitor serves two functions: that of the output load capacitor, and that of the input supply bypass capacitor. Layouts for DC-DC converter designs are critical for overall performance, but following these simple guidlines can simplify the task by avoiding some of the more common mistakes made in these cases. Once actual performance is completed, be sure to double check the design on an actual manufacturing prototype prodcut to verfy that nothing has changed which can affect the performance. |
Аналогичный номер детали - ILC6370CP-50 |
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Аналогичное описание - ILC6370CP-50 |
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