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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SP6121 датащи(PDF) 29 Page - Sipex Corporation |
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SP6121 датащи(HTML) 29 Page - Sipex Corporation |
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29 / 42 page  Mar29-06 SP6121 Buck/Boost Circuit for LED Driver up to 1.5A Copyright ©2006 Page 1 of 4 Sipex Corporation SP6121 Buck/Boost Circuit for LED Driver up to 1.5A Date: March 29, 2006 Designed by: Brian Kennedy Part Number: SP6121CN Application Description: Provide high output current from 3Vin to 5Vin Electrical Requirements: Input Voltage 3.0V – 5.0V Output Voltage ~3.9V (LED VF + 0.15V Vref) Output Current up to 1.5A Circuit Description: This circuit has been designed to provide 3Vin to 5Vin boost to White LEDs at approximately 4V output at 1.5Amps. High efficiency and 3-5Volt input dictated the choice of the controller and external components. In order to reduce the reference voltage to a low 150mV and improve efficiency, an additional IC op amp (LMV321) was used to amplify the reference to 1.2V feedback voltage. The SP6121 is the synchronous buck controller that is being used as a buck/boost DC/DC controller. A P-channel MOSFET and N-channel MOSFET are used for higher efficiency in this synchronous SEPIC buck-boost configuration. The high switching frequency (500 kHz) allows the use of small, mutually-coupled 4.7uH inductors. This report includes the application schematic complete with component part numbers and figures 1-11 illustrating electrical performance of the design. Design Solution 20 |
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