Module spare parts UR6AH

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Typical Applications (continued) The switching losses are very difficult to calculate due to changing parasitics of a given MOSFET in operation. Often, the individual MOSFET datasheet does not give enough information to yield a useful result. Equation 38 and Equation 39 give a rough idea how the switching losses are calculated: (38) (39) 8.2.1.2.7 Input Capacitor Selection Due to the presence of an inductor at the input of a boost converter, the input current waveform is continuous and triangular, as shown in Figure 32. The inductor ensures that the input capacitor sees fairly low ripple currents. However, as the input capacitor gets smaller, the input ripple goes up. The rms current in the input capacitor is given by: (40) The input capacitor should be capable of handling the rms current. Although the input capacitor is not as critical in a boost application, low values can cause impedance interactions. Therefore a good quality capacitor should be chosen in the range of 100 μF to 200 μF. If a value lower than 100 μF is used, then problems with impedance interactions or switching noise can affect the LM3481. To improve performance, especially with VIN below 8 V, it is recommended to use a 20? resistor at the input to provide a RC filter. This resistor is placed in series with the VIN pin with only a bypass capacitor attached to the VIN pin directly (see Figure 34). A 0.1-μF or 1-μF ceramic capacitor is necessary in this configuration. The bulk input capacitor and inductor will connect on the other side of the resistor with the input power supply. Figure 34. Reducing IC Input Noise 8.2.1.2.8 Output Capacitor Selection The output capacitor in a boost converter provides all the output current when the inductor is charging. As a result it sees very large ripple currents. The output capacitor should be capable of handling the maximum rms current. The rms current in the output capacitor is