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ACE7215C Datasheet(PDF) 5 Page - ACE Technology Co., LTD. |
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ACE7215C Datasheet(HTML) 5 Page - ACE Technology Co., LTD. |
5 / 10 page ACE7215C 1.5A 1.5MHz Synchronous Buck Converter VER 1.1 5 Detailed Description The ACE7215C uses a constant frequency, current mode step-down architecture. Both the main (P-channel MOSFET) and synchronous (N-channel MOSFET) switches are internal. During normal operation, the internal top power MOSFET is turned on each cycle when the oscillator sets the RS latch, and turned off when the current comparator, ICOMP, resets the RS latch. The peak inductor current at which ICOMP resets the RS latch, is controlled by the output of error amplifier EA. When the load current increases, it causes a slight decrease in the feedback voltage, FB, relative to the 0.6V reference, which in turn, causes the EA amplifier’s output voltage to increase until the average inductor current matches the new load current. While the top MOSFET is off, the bottom MOSFET is turned on until either the inductor current starts to reverse, as indicated by the current reversal comparator IRCMP, or the beginning of the next clock cycle. Applications Information Setting the Output Voltage In the adjustable version, the output voltage is set by a resistive divider according to the following formula: The external resistive divider is connected to the output, allowing remote voltage sensing as shown in on page 1. Inductor Selection For most designs, the ACE7215C operates with inductors of 1µH to 4.7µH. Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following equation: Where I L is inductor Ripple Current. Large value inductors result in lower ripple current and small value inductors result in high ripple current. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range. |
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