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SS6639-30CZBG Folha de dados(PDF) 9 Page - Silicon Standard Corp. |
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SS6639-30CZBG Folha de dados(HTML) 9 Page - Silicon Standard Corp. |
9 / 12 page www.SiliconStandard.com 9 of 12 SS6639 I PK I IN V EXT ISW I OUT T DIS Charge Co. VSW Discharge Co. ID t Discontinuous Conduction Mode I PK I IN V EXT ISW I OUT VSW ID t Continuous Conduction Mode At the boundary between continuous and discontinuous modes, the output current (IOB) is determined by ( )x 1 * T * L V * 2 1 * V V V I ON IN D OUT IN OB − + = where VD is the diode drop, L T ) R (R X ON S ON ∗ + = RON= Switch turn on resistance, RS= Inductor DC resistance TON = Switch ON time In the discontinuous mode, the switching frequency (Fsw) is ) x (1 * T * V ) (I * ) V V (V * 2(L) F 2 ON 2 IN OUT IN D OUT SW + − + = In the continuous mode, the switching frequency is ( ) − + − + ≅ − + − + − + − + = SW D OUT IN D OUT ON SW D OUT SW IN SW D OUT IN D OUT ON V V V V V V * T 1 )] V V V V V ( 2 x [1 * ) V V (V V V V * T 1 fsw where Vsw = switch drop and is proportional to output current. INDUCTOR SELECTION To operate as an efficient energy transfer element, the inductor must fulfill three requirements. First, the inductance must be low enough for the inductor to store adequate energy under the worst case condition of minimum input voltage and switch ON time. Second, the inductance must also be high enough so the maximum current rating of the SS6639 and the inductor are not exceeded at the other worst case condition of maximum input voltage and ON time. Lastly, the inductor must have sufficiently low DC resistance so excessive power is not lost as heat in the windings. Unfortunately this is inversely related to physical size. Rev.2.01 6/26/2003 |
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Descrição semelhante - SS6639-30CZBG |
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