Transcription of How to Specify the Current Sense Resistor in a Converter ...
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How to Specify the Current Sense Resistor in a Converter ...
Application Report SLUA584A December 2011 1 How to Specify the Current Sense Resistor in a Converter using the ucc28083 John Bottrill We will start this discussion using the schematic of the power circuit in Figure 1 as a reference. Figure 1. Block Diagram of UCC3808x Push-Pull Converter Rs is the sensor of the Current through the output transformer. This Current is made up of several components on the secondary side and primary side that have to be considered. The first two and the most significant of these are the maximum DC output Current (Imax) and the maximum peak-to-peak Current through the output inductor ILout (this occurs at the maximum input voltage (Vinx)). Typical voltage waveforms and Current waveforms through the output inductor at maximum Current are shown in Figure 2. Usually the output inductor is designed to provide a maximum peak to peak ripple Current through the output inductor equal to approximately 20% of the maximum DC Current , though peak to peak ripple currents of 10% are common.
SLUA584A – December 2011 2 How to Specify the Current Sense Resistor in a Converter Using the UCC28083 One can observe that at maximum input voltage, V inmax, the ripple current peak is much higher than at minimum input voltage, V inmin.Also observe that for both maximum and minimum input
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