CC-PAIH01 51405038-175 | HONEYWELL | Input filtering capacitor

Description

CC-PAIH01 51405038-175 | HONEYWELL | Input filtering capacitor

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From the above three equations, the model of rectifier diode should be selected. CC-PAIH01 51405038-175 Next, we need to calculate the value of the input filter capacitor. To calculate the value of the input filtering capacitor, it is necessary to first determine the ripple voltage borne by the DC input terminal of the power supply. To make the voltage ripple smaller, the capacitor needs to be selected larger, so that the current surge during power on is also greater. There are three main aspects to consider when selecting a filtering capacitor: the capacitance value that can meet the expected voltage ripple, the rated voltage of the capacitor, and the rated ripple current of the capacitor. For DC-DC converters, the peak ripple voltage is designed to be (0.1-0.5) V. The size of the input capacitance can be obtained from the following equation。

The minimum value of inductance is generally determined by the requirement of maintaining the minimum load current. The current in an inductor can be divided into two working conditions: continuous and discontinuous. As long as the input and output voltages remain constant, the slope of the current waveform will not change due to a decrease in load current. If the load current gradually decreases and the minimum fluctuation current in L is exactly 0, the current is defined as the critical current, which is equal to half of the peak to peak current, i.e
At that time, the current will enter a discontinuous state, otherwise CC-PAIH01 51405038-175 will be in a continuous state. Although the BUCK converter can operate in discontinuous mode, it brings certain problems to the multi output converter. Generally, the selection of inductance should ensure that the inductance current is continuous even when the minimum specified current is output (usually 1/10 of the rated current), so it should be greater than the critical value for continuous minimum load current; Inductance is an energy storage component, which can reduce the dynamic performance of the power supply and limit the rate of current change when the load undergoes significant instantaneous changes, slowing down the regulating system. Therefore, it is not advisable to choose a larger one.

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