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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC21150ACSTRT датащи(PDF) 16 Page - Semtech Corporation |
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SC21150ACSTRT датащи(HTML) 16 Page - Semtech Corporation |
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16 / 20 page  SC21150 6 Over-current Protection The SC250 provides overload protection through pulse by pulse current limiting. During the high-side on-time, the high-side switches off if the inductor current exceeds 2.2A typically. The low-side turns on briefly, followed by the next high-side on-time. Switching continues while the output overload exists. When the overload is removed, the SC250 will resume normal operation. If the over- load causes high junction temperature, the SC250 will go into Over-temperature protection. Over-temperature Protection The SC250 will shut down if the junction temperature exceeds typically 60 °C. The device will automatically restart after the junction temperature has dropped typi- cally 0 °C. Component Selection The SC250 is optimized for use with components as shown in the Detailed Applications Circuit, page . Inductor: the inductor should be 0.47uH and capable of supporting a minimum current of .2A. Input capacitor: ceramic capacitor, minimum 4.7uF, X5R or X7R or better dielectric. Output capacitor: ceramic capacitor, minimum 0uF, X5R or X7R or better dielectric. Note when operating in Min Off mode, higher output capacitance may needed to reduce output ripple when VIN approaches VOUT. The FB components provide output voltage sensing and feedback compensation to regulate the output. The output voltage is programmed using two resistor along with a compensation capacitor. Rtop To FB pin Rbot VOUT Ctop To FB pin Applications Information (continued) The FB regulation setpoint is 800mV. The output voltage can be calculated as shown. The FB resistor values can be calculated as shown. It is recommended to use 00kΩ for Rbot to minimize power loss in the FB network. The optimum value for Ctop is 22pF. |
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