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AP1695 Datasheet(PDF) 9 Page - Diodes Incorporated |
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AP1695 Datasheet(HTML) 9 Page - Diodes Incorporated |
9 / 15 page AP1695 Document number: DS37312 Rev. 1 - 2 9 of 15 www.diodes.com June 2014 © Diodes Incorporated AP1695 A Product Line of Diodes Incorporated Application Information Based on Buck Structure (Cont.) Design Parameters Setting the Current Sense Resistor R8 According to the equation of the output current, the current sense resistor R8 is determined: _ _ 8 cs ref o mean V Rk I Transformer Selection The typical non-isolated buck circuit in Figure 1 is usually selected, and the system is operating at boundary conduction mode. The switching frequency at the crest is set as fmin, the inductance can be calculated as below: _ _ _ min ( 2 ) 8 2 in rms o o cs ref in rms V V R V L V V f Where, o V is the output voltage. _ in rms V is the RMS value of the input voltage. According to Ferrari's law of electromagnetic induction, the winding turns number of the buck inductance NL is: _ 8 pk cs ref L e m e m L i L V N A B A B R Where, e A is the core effective area. m B is the maximum magnetic flux density. The auxiliary winding is power supply for VCC, the winding turns number Naux is: cc aux L od V NN VV Where, VCC is the power supply voltage for IC from auxiliary winding. Vd is the voltage drop of the freewheel diode. Setting the Initial On Time As the AP1695 adopts constant on time control method, the AP1695 will generate an initial on time to start a working cycle. If the initial on time is longer than the rated on time, overshoot will happen. The initial on time is determined by resister R1 shown in Figure 1. According to initial on time generation mechanism, the ton_initial is: s R t initial on 12 _ 10 1 80 To guarantee the system with no overshoot phenomenon, the resistor R1 is selected: |
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