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SS6639-30CXBG Datasheet(PDF) 11 Page - Silicon Standard Corp. |
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SS6639-30CXBG Datasheet(HTML) 11 Page - Silicon Standard Corp. |
11 / 12 page www.SiliconStandard.com 11 of 12 SS6639 diode such as the 1N5819. Motorola makes the MBR0530 for surface mount. For lower output power a 1N4148 can be used although efficiency and start-up voltage will suffer substantially. COMPONENT POWER DISSIPATION Operating in discontinuous mode, the power loss in the winding resistance of the inductor is approximately equal to ( ) ( ) OUT OUT D OUT S ON L P V V V R L T PD * * * * 3 2 + = where POUT=VOUT * IOUT ; RS=Inductor DC R; VD = Diode drop. The power dissipated in switching losses is ( ) ( ) ) ( * * * * 3 2 OUT OUT ON ON P I R L T PDsw = The power dissipated in the rectifier diode is ( ) OUT OUT D D P V V PD * = Rev.2.01 6/26/2003 |
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