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RLF7030-4R7M Datasheet(PDF) 7 Page - MagnaChip Semiconductor. |
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RLF7030-4R7M Datasheet(HTML) 7 Page - MagnaChip Semiconductor. |
7 / 9 page Confidential Datasheet Version 1.0 July 2015. Revision 1.0 MagnaChip Semiconductor Ltd. 7 Choose an output capacitor to satisfy the output ripple and load transient requirements of the design. A 4.7uF – 22uF ceramic capacitor is suitable for most applications Loop Compensation The output of the transconductance error amplifier(COMP) is used to compensate the regulation control system. The system uses two poles and one zero to stabilize the control loop. The poles are fP1 set by the output capacitor COUT and load resistance and fP2 set by the compensation capacitor C1. The zero fZ1 is set by the compensation capacitor C1 and the compensation resistor R3. For typical application, VIN=12V, VOUT=16.25V, COUT=10uFx3EA, L1=4.7uH, while the recommended value for compensation is as follows : R3 = 100kohm, C1=330pF Selecting the Inductor The inductor is required to force the higher output voltage while being driven by the input voltage. A larger value Inductor results in less ripple current that results in lower peak inductor current, reducing stress on the internal N- channel switch. However, the larger series resistance, and/or lower saturation current. A 4.7uF Inductor is recommended for most 500kHz applications. As a general rule, the peak-to-peak ripple current range is 20% to 40% of the maximum input current. Make sure that the peak inductor current is below 75% of the current limit at The operating duty cycle to prevent loss of regulation due to the current limit. Also make sure that the inductor does not saturate under the worst-case load transient and startup conditions. Calculate the required inductance value by the equation Where ILOAD(MAX) is the maximum load current, ΔI is the peak-to-peak inductor ripple current, and η is efficiency Selecting the Diode The output rectifier diode supplies current to the inductor when the internal MOSFET is off. Schottky diodes are chosen for their low forward voltage drop and fast switching speed. The diode should be rated for a reverse voltage equal to or greater than the output voltage used. The average current rating must exceed the average output current and the peak current rating must be greater than the peak inductor current. |
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