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AME5143 датащи(PDF) 10 Page - Analog Microelectronics |
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AME5143 датащи(HTML) 10 Page - Analog Microelectronics |
10 / 15 page AME 10 1.4MHz Boost Converter with 30V Internal FET Switch AME5143 Rev.A.01 n Application Hints Feed-Forward Compensation Although internally compensated, the feed-forward ca- pacitor Cf is required for stability. Adding this capacitor puts a zero in the loop response of the Converter. The recommended frequency for the zero fz should be ap- proximately 6kHz. Cf can be calculated using the for- mula: Cf = 1 / (2 x π x R1 x fz) Selecting Diodes The external diode used in the typical application should be a Schottky diode. A 30V diode such as the MBR0530 is recommended. The MBR05XX series of diodes are designed to handle a maximum average current of 0.5A. For applications exceeding 0.5A average but less than 1A, a Microsemi UPS5817 can be used. Thermal Consuderations At higher duty cycles, the increased ON time of the FET means the maximum output current will be deter- mined by power dissipation within the AME5143 FET switch. The switch power dissipation from ON-state con- duction is calculated by: P (SW) = D x I 2 IND(AVE)x RDS(ON) There will be some switching losses as well, so some derating needs to be applied when calculating IC power dissipation. Inductor Suppliers Recommended suppliers of inductors for this product include, but are not limited to Sumida, Coilcraft, Panasonic, TDK and Murata. When selecting an inductor, make cer- tain that the continuous current rating is high enough to avoid saturation at peak currents. A suitable core type must be used to minimize core (switching) losses, and wire power losses must be considered when selecting the current rating. Shutdown Pin Operation The device is turned off by pulling the shutdown pin low. If this function is not going to be used, the pin should be tied directly to V IN. If the SHDN function will be needed, a pull-up resistor must be used to V IN (approximately 50k- 100k recommended). The EN pin must not be left unterminated. |
Аналогичный номер детали - AME5143 |
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Аналогичное описание - AME5143 |
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