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MC270A330M024FP bảng dữ liệu(PDF) 11 Page - Vicor Corporation |
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MC270A330M024FP bảng dữ liệu(HTML) 11 Page - Vicor Corporation |
11 / 17 page PRELIMINARY DATASHEET Bus Converter Module MC270A330M024FP vicorpower.com Rev. 1.0 Page 11 of 17 Power, Voltage, Efficiency Relationships Because of the high frequency, fully resonant SAC topology, power dissipation and overall conversion efficiency of BCM converters can be estimated as shown below. Key relationships to be considered are the following: 1. Transfer Function a. No load condition VOUT = VIN • K Eq. 1 Where K (transformer turns ratio) is constant for each part number b. Loaded condition VOUT = Vin • K – IOUT • ROUT Eq. 2 2. Dissipated Power The two main terms of power losses in the BCM module are: - No load power dissipation (PNL) defined as the power used to power up the module with an enabled power train at no load. - Resistive loss (ROUT) refers to the power loss across the BCM modeled as pure resistive impedance. PDISSIPATED ~ PNL + PR OUT Eq. 3 ~ Therefore, with reference to the diagram shown in Figure 16 POUT = PIN –PDISSIPATED = PIN –PNL –PR OUT Eq. 4 Notice that ROUT is temperature and input voltage dependent and PNL is temperature dependent (See Figure 16). INPUT POWER OUTPUT POWER PNL PR OUT Figure 19 — Power transfer diagram The above relations can be combined to calculate the overall module efficiency: η = POUT = PIN –PNL –PR OUT = PIN PIN VIN • IIN –PNL –(IOUT) 2 • ROUT =1 – (PNL+ (IOUT)2•ROUT) VIN • IIN VIN • IIN Eq. 5 EFFICIENCY / DISSIPATION |
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