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7447462022 데이터시트(PDF) 6 Page - Infineon Technologies AG |
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7447462022 데이터시트(HTML) 6 Page - Infineon Technologies AG |
6 / 25 page 12W 5V SMPS evaluation board with ICE3AR4780VJZ Circuit description Application Note 6 Revision 1.2, 2015-05-12 5.8 Peak current control of primary current The CoolMOS™ drain source current is sensed via external shunt resistors R14 and R14A which determine the tolerance of the current limit control. Since ICE3AR4780VJZ is a current mode controller, it would have a cycle-by-cycle primary current and feedback voltage control which can make sure the maximum power of the converter is controlled in every switching cycle. Besides, the patented propagation delay compensation is implemented to ensure the maximum input power can be controlled in an even tighter manner. The evaluation board shows approximately ±2.2% of average maximum input power (refer to Figure 11). 5.9 Output stage On the secondary side the power is coupled out by a schottky diode D21. The capacitor C22 & C23 provides energy buffering following with the LC filter L21 and C24 to reduce the output voltage ripple considerably. Storage capacitors C22 & C23 are selected to have a very small internal resistance (ESR) to minimize the output voltage ripple. |
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